From jianbin at apache.org  Wed Jul  2 02:45:33 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Wed, 2 Jul 2025 10:45:33 +0800
Subject: Virtual threads created more platform threads
Message-ID: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>

Hi Loom-dev Community,

I have a question about platform thread creation triggered by calling
future.get() within virtual threads, and I would like to ask the community
for assistance. The detailed information can be found in this issue:
https://github.com/adoptium/adoptium-support/issues/1319. I hope to receive
some help from the community regarding this matter. Thank you.
Additionally, I'd like to know if this situation will still occur in JDK 24
and above?

Best Regards.
Jianbin Chen, github-id: funky-eyes


Best Regards.
Jianbin Chen, github-id: funky-eyes
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From robaho at me.com  Wed Jul  2 03:03:16 2025
From: robaho at me.com (Robert Engels)
Date: Tue, 1 Jul 2025 22:03:16 -0500
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
Message-ID: <499C4B59-4976-4DED-98A5-AF6272902D38@me.com>

Future.get() should not create additional platforms threads. I suspect it is something else. I would start by providing a simple test case using futures only and you shouldn?t see them increase. 

> On Jul 1, 2025, at 9:47?PM, Jianbin Chen <jianbin at apache.org> wrote:
> 
> ?
> 
> Hi Loom-dev Community,
> 
> I have a question about platform thread creation triggered by calling future.get() within virtual threads, and I would like to ask the community for assistance. The detailed information can be found in this issue: https://github.com/adoptium/adoptium-support/issues/1319. I hope to receive some help from the community regarding this matter. Thank you.
> Additionally, I'd like to know if this situation will still occur in JDK 24 and above?
> 
> Best Regards.
> Jianbin Chen, github-id: funky-eyes
> 
> 
> Best Regards.
> Jianbin Chen, github-id: funky-eyes
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From liangchenblue at gmail.com  Wed Jul  2 03:16:39 2025
From: liangchenblue at gmail.com (Chen Liang)
Date: Tue, 1 Jul 2025 22:16:39 -0500
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
Message-ID: <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>

Hello, I don't think this would happen for JDK 24 - JEP 491 removed the
code that calls Blocker in Object.wait, which is exactly the goal of that
JEP.

Note that virtual threads are still pinned when call stack goes into
native, as native execution may pass address to stack variables that will
be lost in context switches. In these cases, the traditional managed block
happens again.

P.S. I personally think it is somewhat not responsible for JDK vendors to
ask users to upstream a question for an older JDK release that might no
longer apply on the latest release to a development-oriented mailing list.

On Tue, Jul 1, 2025 at 9:47?PM Jianbin Chen <jianbin at apache.org> wrote:

>
> Hi Loom-dev Community,
>
> I have a question about platform thread creation triggered by calling
> future.get() within virtual threads, and I would like to ask the community
> for assistance. The detailed information can be found in this issue:
> https://github.com/adoptium/adoptium-support/issues/1319. I hope to
> receive some help from the community regarding this matter. Thank you.
> Additionally, I'd like to know if this situation will still occur in JDK
> 24 and above?
>
> Best Regards.
> Jianbin Chen, github-id: funky-eyes
>
>
> Best Regards.
> Jianbin Chen, github-id: funky-eyes
>
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From petereastham at gmail.com  Wed Jul  2 04:15:00 2025
From: petereastham at gmail.com (Peter Eastham)
Date: Tue, 1 Jul 2025 22:15:00 -0600
Subject: Virtual threads created more platform threads
In-Reply-To: <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
Message-ID: <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>

I hope to not create noise with my own comments, and I will concur with you
that JEP 491 should mean this is resolved in Java 24, which Jianbin Chen
should try out before and then alongside Robert's recommendation for
creating a very simple reproduction.

As Java 21 is still the current LTS, it isn't completely unreasonable to
forward concerns to the mailing list. My understanding in this particular
case is that JEP 491 is not going to be back ported to Java 21 as it has a
dependency from a change in Java 23. (Potentially more, I can't remember
the conversation completely, I only skimmed that email chain)


Thanks,
- Peter

P.S. As I do a similar job, I'd like to call out that Vendors letting the
occasional support question slip into here is a fine price to pay for the
amount of questions they handle instead.



On Tue, Jul 1, 2025, 9:17?PM Chen Liang <liangchenblue at gmail.com> wrote:

> Hello, I don't think this would happen for JDK 24 - JEP 491 removed the
> code that calls Blocker in Object.wait, which is exactly the goal of that
> JEP.
>
> Note that virtual threads are still pinned when call stack goes into
> native, as native execution may pass address to stack variables that will
> be lost in context switches. In these cases, the traditional managed block
> happens again.
>
> P.S. I personally think it is somewhat not responsible for JDK vendors to
> ask users to upstream a question for an older JDK release that might no
> longer apply on the latest release to a development-oriented mailing list.
>
> On Tue, Jul 1, 2025 at 9:47?PM Jianbin Chen <jianbin at apache.org> wrote:
>
>>
>> Hi Loom-dev Community,
>>
>> I have a question about platform thread creation triggered by calling
>> future.get() within virtual threads, and I would like to ask the community
>> for assistance. The detailed information can be found in this issue:
>> https://github.com/adoptium/adoptium-support/issues/1319. I hope to
>> receive some help from the community regarding this matter. Thank you.
>> Additionally, I'd like to know if this situation will still occur in JDK
>> 24 and above?
>>
>> Best Regards.
>> Jianbin Chen, github-id: funky-eyes
>>
>>
>> Best Regards.
>> Jianbin Chen, github-id: funky-eyes
>>
>
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From jianbin at apache.org  Wed Jul  2 04:51:56 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Wed, 2 Jul 2025 12:51:56 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
Message-ID: <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>

Hi everyone,
thank you for your replies and assistance. So this issue occurring in JDK
21 is considered normal behavior, correct? However, I've observed that
these expanded threads are not being garbage collected - they remain in a
waiting state for several minutes without disappearing. Sometimes they can
expand to several hundred threads, and these threads, once created, remain
unused, continuously wasting thread resources. Therefore, I'm attaching a
local reproduction example of this issue to ensure the information in this
email is complete.
-Djava.util.concurrent.ForkJoinPool.common.parallelism=1
`
The following example clearly shows the forkjoinpool expanding. I have also
recorded the runtime stack trace for this and submitted it as an attachment.

```
    public static void main(String[] args) throws InterruptedException {
        Executor executor =
ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
        String a = "a";
        executor.execute(() -> {
            synchronized (a) {
            try {
            a.wait();
            } catch (InterruptedException e) {
            throw new RuntimeException(e);
            }
            }
        });
        executor.execute(() -> {
            synchronized (a) {
            try {
            a.wait();
            } catch (InterruptedException e) {
            throw new RuntimeException(e);
            }
            }
        });
        Thread.sleep(120000);
    }
```
After switching to using condition, it can be clearly observed through
jstack that the forkjoinpool did not expand as many threads, but 3 threads
still appeared, which might be related to incorrect usage of my JVM
parameters.

```
 public static void main(String[] args) throws InterruptedException {
        Executor executor =
ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
        List<ReentrantLock> list = new ArrayList<>();
        list.add(new ReentrantLock());
        list.add(new ReentrantLock());
        list.add(new ReentrantLock());
        list.add(new ReentrantLock());
        list.add(new ReentrantLock());
        list.add(new ReentrantLock());
        for (int i = 0; i < list.size(); i++) {
            ReentrantLock value = list.get(i);
       Condition condition = value.newCondition();
            executor.execute(() -> {
                value.lock();
                    try {
                        condition.await();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }finally {
                        value.unlock();
                    }
            });
        }
        Thread.sleep(120000);
    }
```

Best Regards.
Jianbin Chen, github-id: funky-eyes

Peter Eastham <petereastham at gmail.com> ? 2025?7?2??? 12:16???

> I hope to not create noise with my own comments, and I will concur with
> you that JEP 491 should mean this is resolved in Java 24, which Jianbin
> Chen should try out before and then alongside Robert's recommendation for
> creating a very simple reproduction.
>
> As Java 21 is still the current LTS, it isn't completely unreasonable to
> forward concerns to the mailing list. My understanding in this particular
> case is that JEP 491 is not going to be back ported to Java 21 as it has a
> dependency from a change in Java 23. (Potentially more, I can't remember
> the conversation completely, I only skimmed that email chain)
>
>
> Thanks,
> - Peter
>
> P.S. As I do a similar job, I'd like to call out that Vendors letting the
> occasional support question slip into here is a fine price to pay for the
> amount of questions they handle instead.
>
>
>
> On Tue, Jul 1, 2025, 9:17?PM Chen Liang <liangchenblue at gmail.com> wrote:
>
>> Hello, I don't think this would happen for JDK 24 - JEP 491 removed the
>> code that calls Blocker in Object.wait, which is exactly the goal of that
>> JEP.
>>
>> Note that virtual threads are still pinned when call stack goes into
>> native, as native execution may pass address to stack variables that will
>> be lost in context switches. In these cases, the traditional managed block
>> happens again.
>>
>> P.S. I personally think it is somewhat not responsible for JDK vendors to
>> ask users to upstream a question for an older JDK release that might no
>> longer apply on the latest release to a development-oriented mailing list.
>>
>> On Tue, Jul 1, 2025 at 9:47?PM Jianbin Chen <jianbin at apache.org> wrote:
>>
>>>
>>> Hi Loom-dev Community,
>>>
>>> I have a question about platform thread creation triggered by calling
>>> future.get() within virtual threads, and I would like to ask the community
>>> for assistance. The detailed information can be found in this issue:
>>> https://github.com/adoptium/adoptium-support/issues/1319. I hope to
>>> receive some help from the community regarding this matter. Thank you.
>>> Additionally, I'd like to know if this situation will still occur in JDK
>>> 24 and above?
>>>
>>> Best Regards.
>>> Jianbin Chen, github-id: funky-eyes
>>>
>>>
>>> Best Regards.
>>> Jianbin Chen, github-id: funky-eyes
>>>
>>
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From liangchenblue at gmail.com  Wed Jul  2 04:56:12 2025
From: liangchenblue at gmail.com (Chen Liang)
Date: Tue, 1 Jul 2025 23:56:12 -0500
Subject: Virtual threads created more platform threads
In-Reply-To: <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
Message-ID: <CABe8uE0w7vk1H84n19k1347fttu-=BMrUHVC9Rf3MG7skZjPxA@mail.gmail.com>

Hello Peter,
I find multiple misunderstandings in your response. Let me clarify these.

About the process: Jianbin is using a specific product maintained by a
vendor for an older JDK release. The vendor should ask the Jianbin to try
on the latest JDK release before asking to forwarding this to loom. We
cannot expect general users to understand the order of steps to take here.

About backporting: JEP 14, the tip and tail release model, explicitly rules
out the tail releases from addition of performance improvements; JEP 491 is
clearly not crucial to the security of older releases and should not be
backported.

About LTS releases: they are not associated with the active development of
JDK, as evident on jdk.java.net. Any vendor can declare any release
supported; they must at least provide quarterly updates with all security
fixes. For openjdk, all past releases that are supported in open source are
discussed on the jdk-updates-dev list. Oracle offers premium support (not
part of openjdk) for their chosen releases called LTS releases, and
openjdk's jdk updates project decides to support the same releases. The
argument that active jdk development is responsible for maintenance of a
particular supported release, including ones considered LTS, does not stand.

On Tue, Jul 1, 2025, 23:15 Peter Eastham <petereastham at gmail.com> wrote:

> I hope to not create noise with my own comments, and I will concur with
> you that JEP 491 should mean this is resolved in Java 24, which Jianbin
> Chen should try out before and then alongside Robert's recommendation for
> creating a very simple reproduction.
>
> As Java 21 is still the current LTS, it isn't completely unreasonable to
> forward concerns to the mailing list. My understanding in this particular
> case is that JEP 491 is not going to be back ported to Java 21 as it has a
> dependency from a change in Java 23. (Potentially more, I can't remember
> the conversation completely, I only skimmed that email chain)
>
>
> Thanks,
> - Peter
>
> P.S. As I do a similar job, I'd like to call out that Vendors letting the
> occasional support question slip into here is a fine price to pay for the
> amount of questions they handle instead.
>
>
>
> On Tue, Jul 1, 2025, 9:17?PM Chen Liang <liangchenblue at gmail.com> wrote:
>
>> Hello, I don't think this would happen for JDK 24 - JEP 491 removed the
>> code that calls Blocker in Object.wait, which is exactly the goal of that
>> JEP.
>>
>> Note that virtual threads are still pinned when call stack goes into
>> native, as native execution may pass address to stack variables that will
>> be lost in context switches. In these cases, the traditional managed block
>> happens again.
>>
>> P.S. I personally think it is somewhat not responsible for JDK vendors to
>> ask users to upstream a question for an older JDK release that might no
>> longer apply on the latest release to a development-oriented mailing list.
>>
>> On Tue, Jul 1, 2025 at 9:47?PM Jianbin Chen <jianbin at apache.org> wrote:
>>
>>>
>>> Hi Loom-dev Community,
>>>
>>> I have a question about platform thread creation triggered by calling
>>> future.get() within virtual threads, and I would like to ask the community
>>> for assistance. The detailed information can be found in this issue:
>>> https://github.com/adoptium/adoptium-support/issues/1319. I hope to
>>> receive some help from the community regarding this matter. Thank you.
>>> Additionally, I'd like to know if this situation will still occur in JDK
>>> 24 and above?
>>>
>>> Best Regards.
>>> Jianbin Chen, github-id: funky-eyes
>>>
>>>
>>> Best Regards.
>>> Jianbin Chen, github-id: funky-eyes
>>>
>>
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From liangchenblue at gmail.com  Wed Jul  2 04:57:56 2025
From: liangchenblue at gmail.com (Chen Liang)
Date: Tue, 1 Jul 2025 23:57:56 -0500
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>
Message-ID: <CABe8uE2QBLz=AOHv9tDFYBDXvWOw4nOESjCf4R=OqO3QZpVvxA@mail.gmail.com>

Hello Jianbin, please provide a test case that can reproduce this issue on
24. 21 is not supported by active JDK development.

On Tue, Jul 1, 2025, 23:52 Jianbin Chen <jianbin at apache.org> wrote:

> Hi everyone,
> thank you for your replies and assistance. So this issue occurring in JDK
> 21 is considered normal behavior, correct? However, I've observed that
> these expanded threads are not being garbage collected - they remain in a
> waiting state for several minutes without disappearing. Sometimes they can
> expand to several hundred threads, and these threads, once created, remain
> unused, continuously wasting thread resources. Therefore, I'm attaching a
> local reproduction example of this issue to ensure the information in this
> email is complete.
> -Djava.util.concurrent.ForkJoinPool.common.parallelism=1
> `
> The following example clearly shows the forkjoinpool expanding. I have
> also recorded the runtime stack trace for this and submitted it as an
> attachment.
>
> ```
>     public static void main(String[] args) throws InterruptedException {
>         Executor executor =
> ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
>         String a = "a";
>         executor.execute(() -> {
>             synchronized (a) {
>             try {
>             a.wait();
>             } catch (InterruptedException e) {
>             throw new RuntimeException(e);
>             }
>             }
>         });
>         executor.execute(() -> {
>             synchronized (a) {
>             try {
>             a.wait();
>             } catch (InterruptedException e) {
>             throw new RuntimeException(e);
>             }
>             }
>         });
>         Thread.sleep(120000);
>     }
> ```
> After switching to using condition, it can be clearly observed through
> jstack that the forkjoinpool did not expand as many threads, but 3 threads
> still appeared, which might be related to incorrect usage of my JVM
> parameters.
>
> ```
>  public static void main(String[] args) throws InterruptedException {
>         Executor executor =
> ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
>         List<ReentrantLock> list = new ArrayList<>();
>         list.add(new ReentrantLock());
>         list.add(new ReentrantLock());
>         list.add(new ReentrantLock());
>         list.add(new ReentrantLock());
>         list.add(new ReentrantLock());
>         list.add(new ReentrantLock());
>         for (int i = 0; i < list.size(); i++) {
>             ReentrantLock value = list.get(i);
>        Condition condition = value.newCondition();
>             executor.execute(() -> {
>                 value.lock();
>                     try {
>                         condition.await();
>                     } catch (InterruptedException e) {
>                         throw new RuntimeException(e);
>                     }finally {
>                         value.unlock();
>                     }
>             });
>         }
>         Thread.sleep(120000);
>     }
> ```
>
> Best Regards.
> Jianbin Chen, github-id: funky-eyes
>
> Peter Eastham <petereastham at gmail.com> ? 2025?7?2??? 12:16???
>
>> I hope to not create noise with my own comments, and I will concur with
>> you that JEP 491 should mean this is resolved in Java 24, which Jianbin
>> Chen should try out before and then alongside Robert's recommendation for
>> creating a very simple reproduction.
>>
>> As Java 21 is still the current LTS, it isn't completely unreasonable to
>> forward concerns to the mailing list. My understanding in this particular
>> case is that JEP 491 is not going to be back ported to Java 21 as it has a
>> dependency from a change in Java 23. (Potentially more, I can't remember
>> the conversation completely, I only skimmed that email chain)
>>
>>
>> Thanks,
>> - Peter
>>
>> P.S. As I do a similar job, I'd like to call out that Vendors letting the
>> occasional support question slip into here is a fine price to pay for the
>> amount of questions they handle instead.
>>
>>
>>
>> On Tue, Jul 1, 2025, 9:17?PM Chen Liang <liangchenblue at gmail.com> wrote:
>>
>>> Hello, I don't think this would happen for JDK 24 - JEP 491 removed the
>>> code that calls Blocker in Object.wait, which is exactly the goal of that
>>> JEP.
>>>
>>> Note that virtual threads are still pinned when call stack goes into
>>> native, as native execution may pass address to stack variables that will
>>> be lost in context switches. In these cases, the traditional managed block
>>> happens again.
>>>
>>> P.S. I personally think it is somewhat not responsible for JDK vendors
>>> to ask users to upstream a question for an older JDK release that might no
>>> longer apply on the latest release to a development-oriented mailing list.
>>>
>>> On Tue, Jul 1, 2025 at 9:47?PM Jianbin Chen <jianbin at apache.org> wrote:
>>>
>>>>
>>>> Hi Loom-dev Community,
>>>>
>>>> I have a question about platform thread creation triggered by calling
>>>> future.get() within virtual threads, and I would like to ask the community
>>>> for assistance. The detailed information can be found in this issue:
>>>> https://github.com/adoptium/adoptium-support/issues/1319. I hope to
>>>> receive some help from the community regarding this matter. Thank you.
>>>> Additionally, I'd like to know if this situation will still occur in
>>>> JDK 24 and above?
>>>>
>>>> Best Regards.
>>>> Jianbin Chen, github-id: funky-eyes
>>>>
>>>>
>>>> Best Regards.
>>>> Jianbin Chen, github-id: funky-eyes
>>>>
>>>
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From jianbin at apache.org  Wed Jul  2 05:50:27 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Wed, 2 Jul 2025 13:50:27 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <CABe8uE2QBLz=AOHv9tDFYBDXvWOw4nOESjCf4R=OqO3QZpVvxA@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>
 <CABe8uE2QBLz=AOHv9tDFYBDXvWOw4nOESjCf4R=OqO3QZpVvxA@mail.gmail.com>
Message-ID: <CAAMX02rQXRQAAFan4dvfhHN-4vAfdxvcZ5baZHvvCjvYKkpvng@mail.gmail.com>

Hi Liang,

Thank you and everyone for your patient answers. I verified this with JDK
24, and the same example did not show platform thread growth. However,
there's one thing I don't understand: why are these threads never
reclaimed? Most of them are in a waiting state - isn't this a waste of
resources? Sometimes it increases by hundreds of threads. Is there any way
to suppress this behavior on JDK 21?

Best Regards.
Jianbin Chen, github-id: funky-eyes

Chen Liang <liangchenblue at gmail.com> ? 2025?7?2??? 12:58???

> Hello Jianbin, please provide a test case that can reproduce this issue on
> 24. 21 is not supported by active JDK development.
>
> On Tue, Jul 1, 2025, 23:52 Jianbin Chen <jianbin at apache.org> wrote:
>
>> Hi everyone,
>> thank you for your replies and assistance. So this issue occurring in JDK
>> 21 is considered normal behavior, correct? However, I've observed that
>> these expanded threads are not being garbage collected - they remain in a
>> waiting state for several minutes without disappearing. Sometimes they can
>> expand to several hundred threads, and these threads, once created, remain
>> unused, continuously wasting thread resources. Therefore, I'm attaching a
>> local reproduction example of this issue to ensure the information in this
>> email is complete.
>> -Djava.util.concurrent.ForkJoinPool.common.parallelism=1
>> `
>> The following example clearly shows the forkjoinpool expanding. I have
>> also recorded the runtime stack trace for this and submitted it as an
>> attachment.
>>
>> ```
>>     public static void main(String[] args) throws InterruptedException {
>>         Executor executor =
>> ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
>>         String a = "a";
>>         executor.execute(() -> {
>>             synchronized (a) {
>>             try {
>>             a.wait();
>>             } catch (InterruptedException e) {
>>             throw new RuntimeException(e);
>>             }
>>             }
>>         });
>>         executor.execute(() -> {
>>             synchronized (a) {
>>             try {
>>             a.wait();
>>             } catch (InterruptedException e) {
>>             throw new RuntimeException(e);
>>             }
>>             }
>>         });
>>         Thread.sleep(120000);
>>     }
>> ```
>> After switching to using condition, it can be clearly observed through
>> jstack that the forkjoinpool did not expand as many threads, but 3 threads
>> still appeared, which might be related to incorrect usage of my JVM
>> parameters.
>>
>> ```
>>  public static void main(String[] args) throws InterruptedException {
>>         Executor executor =
>> ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
>>         List<ReentrantLock> list = new ArrayList<>();
>>         list.add(new ReentrantLock());
>>         list.add(new ReentrantLock());
>>         list.add(new ReentrantLock());
>>         list.add(new ReentrantLock());
>>         list.add(new ReentrantLock());
>>         list.add(new ReentrantLock());
>>         for (int i = 0; i < list.size(); i++) {
>>             ReentrantLock value = list.get(i);
>>        Condition condition = value.newCondition();
>>             executor.execute(() -> {
>>                 value.lock();
>>                     try {
>>                         condition.await();
>>                     } catch (InterruptedException e) {
>>                         throw new RuntimeException(e);
>>                     }finally {
>>                         value.unlock();
>>                     }
>>             });
>>         }
>>         Thread.sleep(120000);
>>     }
>> ```
>>
>> Best Regards.
>> Jianbin Chen, github-id: funky-eyes
>>
>> Peter Eastham <petereastham at gmail.com> ? 2025?7?2??? 12:16???
>>
>>> I hope to not create noise with my own comments, and I will concur with
>>> you that JEP 491 should mean this is resolved in Java 24, which Jianbin
>>> Chen should try out before and then alongside Robert's recommendation for
>>> creating a very simple reproduction.
>>>
>>> As Java 21 is still the current LTS, it isn't completely unreasonable to
>>> forward concerns to the mailing list. My understanding in this particular
>>> case is that JEP 491 is not going to be back ported to Java 21 as it has a
>>> dependency from a change in Java 23. (Potentially more, I can't remember
>>> the conversation completely, I only skimmed that email chain)
>>>
>>>
>>> Thanks,
>>> - Peter
>>>
>>> P.S. As I do a similar job, I'd like to call out that Vendors letting
>>> the occasional support question slip into here is a fine price to pay for
>>> the amount of questions they handle instead.
>>>
>>>
>>>
>>> On Tue, Jul 1, 2025, 9:17?PM Chen Liang <liangchenblue at gmail.com> wrote:
>>>
>>>> Hello, I don't think this would happen for JDK 24 - JEP 491 removed the
>>>> code that calls Blocker in Object.wait, which is exactly the goal of that
>>>> JEP.
>>>>
>>>> Note that virtual threads are still pinned when call stack goes into
>>>> native, as native execution may pass address to stack variables that will
>>>> be lost in context switches. In these cases, the traditional managed block
>>>> happens again.
>>>>
>>>> P.S. I personally think it is somewhat not responsible for JDK vendors
>>>> to ask users to upstream a question for an older JDK release that might no
>>>> longer apply on the latest release to a development-oriented mailing list.
>>>>
>>>> On Tue, Jul 1, 2025 at 9:47?PM Jianbin Chen <jianbin at apache.org> wrote:
>>>>
>>>>>
>>>>> Hi Loom-dev Community,
>>>>>
>>>>> I have a question about platform thread creation triggered by calling
>>>>> future.get() within virtual threads, and I would like to ask the community
>>>>> for assistance. The detailed information can be found in this issue:
>>>>> https://github.com/adoptium/adoptium-support/issues/1319. I hope to
>>>>> receive some help from the community regarding this matter. Thank you.
>>>>> Additionally, I'd like to know if this situation will still occur in
>>>>> JDK 24 and above?
>>>>>
>>>>> Best Regards.
>>>>> Jianbin Chen, github-id: funky-eyes
>>>>>
>>>>>
>>>>> Best Regards.
>>>>> Jianbin Chen, github-id: funky-eyes
>>>>>
>>>>
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From alan.bateman at oracle.com  Wed Jul  2 06:30:44 2025
From: alan.bateman at oracle.com (Alan Bateman)
Date: Wed, 2 Jul 2025 07:30:44 +0100
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02rQXRQAAFan4dvfhHN-4vAfdxvcZ5baZHvvCjvYKkpvng@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>
 <CABe8uE2QBLz=AOHv9tDFYBDXvWOw4nOESjCf4R=OqO3QZpVvxA@mail.gmail.com>
 <CAAMX02rQXRQAAFan4dvfhHN-4vAfdxvcZ5baZHvvCjvYKkpvng@mail.gmail.com>
Message-ID: <b088b1bb-4383-4e9c-a2c6-6017ae8f9072@oracle.com>


On 02/07/2025 06:50, Jianbin Chen wrote:
> :
>
> Thank you and everyone for your patient answers. I verified this with 
> JDK 24, and the same example did not show platform thread growth. 
> However, there's one thing I don't understand: why are these threads 
> never reclaimed? Most of them are in a waiting state - isn't this a 
> waste of resources? Sometimes it increases by hundreds of threads. Is 
> there any way to suppress this behavior on JDK 21?

Just to confirm what was already said. The stack trace in the issue 
shows Netty DefaultPromise.await in Object.wait. Prior to JDK 24 this 
pinned the carrier thread. The implementation (prior to JDK 24) attempts 
to compensate for this by arranging for a spare platform thread (FJP 
worker) to be available. This seems to be what you are seeing. The 
number of threads won't grow to more than 256. The "Implementation Note" 
section of the Thread class description documents the system property to 
change this limit if necessary. It's very possible that setting it to a 
number will cause the system to hang/deadlock as no virtual thread can 
make progress if they are all blocked in Object.wait and waiting for 
another virtual thread to notify.

As regards trimming. The idle workers will terminate once a keep alive 
time (30s, not configurable) is reached but only if the system is idle 
(at quiescent in FJP speak). In a busy system, or even a tiny load such 
as heart beat, then it may not happen. There were improvements in JDK 22 
[1] but it still requires that the system be idle for threads to terminate.

-Alan

[1] https://bugs.openjdk.org/browse/JDK-8319662

From jianbin at apache.org  Wed Jul  2 07:25:31 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Wed, 2 Jul 2025 15:25:31 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <b088b1bb-4383-4e9c-a2c6-6017ae8f9072@oracle.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>
 <CABe8uE2QBLz=AOHv9tDFYBDXvWOw4nOESjCf4R=OqO3QZpVvxA@mail.gmail.com>
 <CAAMX02rQXRQAAFan4dvfhHN-4vAfdxvcZ5baZHvvCjvYKkpvng@mail.gmail.com>
 <b088b1bb-4383-4e9c-a2c6-6017ae8f9072@oracle.com>
Message-ID: <CAAMX02qCgfaas4bWHPhBq5wJPR8t7yiRMyocMWQwAd5xRD96zA@mail.gmail.com>

Hi Alan,

Thank you for your detailed explanation, but I still have some questions.

I added these parameters to limit platform threads:
-Djava.util.concurrent.ForkJoinPool.common.parallelism=2
-Djdk.virtualThreadScheduler.parallelism=2
-Djdk.virtualThreadScheduler.maxPoolSize=2
-Djava.util.concurrent.ForkJoinPool.common.maximumSpares=2.

Initially, I only added `jdk.virtualThreadScheduler.maxPoolSize=2`, but I
found it had no effect. I then thought this parameter only limits the
number of platform threads for normal virtual threads and doesn't cover
cases with pinned threads. So I added the
java.util.concurrent.ForkJoinPool.common.maximumSpares parameter again, but
it still had no effect - the threads keep growing. My JDK version is
Temurin OpenJDK 21.0.7+6. I've also attached the jstack stack trace
information.

Best Regards.
Jianbin Chen, github-id: funky-eyes

Alan Bateman <alan.bateman at oracle.com> ? 2025?7?2??? 14:31???

>
> On 02/07/2025 06:50, Jianbin Chen wrote:
> > :
> >
> > Thank you and everyone for your patient answers. I verified this with
> > JDK 24, and the same example did not show platform thread growth.
> > However, there's one thing I don't understand: why are these threads
> > never reclaimed? Most of them are in a waiting state - isn't this a
> > waste of resources? Sometimes it increases by hundreds of threads. Is
> > there any way to suppress this behavior on JDK 21?
>
> Just to confirm what was already said. The stack trace in the issue
> shows Netty DefaultPromise.await in Object.wait. Prior to JDK 24 this
> pinned the carrier thread. The implementation (prior to JDK 24) attempts
> to compensate for this by arranging for a spare platform thread (FJP
> worker) to be available. This seems to be what you are seeing. The
> number of threads won't grow to more than 256. The "Implementation Note"
> section of the Thread class description documents the system property to
> change this limit if necessary. It's very possible that setting it to a
> number will cause the system to hang/deadlock as no virtual thread can
> make progress if they are all blocked in Object.wait and waiting for
> another virtual thread to notify.
>
> As regards trimming. The idle workers will terminate once a keep alive
> time (30s, not configurable) is reached but only if the system is idle
> (at quiescent in FJP speak). In a busy system, or even a tiny load such
> as heart beat, then it may not happen. There were improvements in JDK 22
> [1] but it still requires that the system be idle for threads to terminate.
>
> -Alan
>
> [1] https://bugs.openjdk.org/browse/JDK-8319662
>
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From alan.bateman at oracle.com  Wed Jul  2 08:23:33 2025
From: alan.bateman at oracle.com (Alan Bateman)
Date: Wed, 2 Jul 2025 09:23:33 +0100
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02qCgfaas4bWHPhBq5wJPR8t7yiRMyocMWQwAd5xRD96zA@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <CAAMX02pdW_HQ=A5Gqz_hZ0W-1S5q3X0ndrQ0r2=8y17-3-Zc_g@mail.gmail.com>
 <CABe8uE2QBLz=AOHv9tDFYBDXvWOw4nOESjCf4R=OqO3QZpVvxA@mail.gmail.com>
 <CAAMX02rQXRQAAFan4dvfhHN-4vAfdxvcZ5baZHvvCjvYKkpvng@mail.gmail.com>
 <b088b1bb-4383-4e9c-a2c6-6017ae8f9072@oracle.com>
 <CAAMX02qCgfaas4bWHPhBq5wJPR8t7yiRMyocMWQwAd5xRD96zA@mail.gmail.com>
Message-ID: <6dbff31e-6e71-4122-a8f6-a1f3d215a9a7@oracle.com>



On 02/07/2025 08:25, Jianbin Chen wrote:
> :
> Initially, I only added `jdk.virtualThreadScheduler.maxPoolSize=2`, 
> but I found it had no effect.

Are you 100% sure that you specify the -D as a VM option rather than a 
program argument?

-Alan

From aph-open at littlepinkcloud.com  Wed Jul  2 08:27:48 2025
From: aph-open at littlepinkcloud.com (Andrew Haley)
Date: Wed, 2 Jul 2025 09:27:48 +0100
Subject: Virtual threads created more platform threads
In-Reply-To: <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
Message-ID: <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>

On 02/07/2025 05:15, Peter Eastham wrote:
> As Java 21 is still the current LTS, it isn't completely unreasonable to
> forward concerns to the mailing list.

Sure, we'e happy to talk about it, but as far as this group is concerned 
the issue has been resolved.

Andrew.


From jianbin at apache.org  Wed Jul  2 09:14:32 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Wed, 2 Jul 2025 17:14:32 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
Message-ID: <CAAMX02rYQq2aostVFvvu0j8iYq9vhm8jDroXSjpczHPhDUtQEA@mail.gmail.com>

I'm sorry, I was running the main method directly in IDEA. I tried to add
the parameters through 'add vm options' in 'edit configuration', but I
selected the wrong option - I chose 'program arguments' so the parameters
didn't take effect. Now I have successfully limited the maximum number of
platform threads through jdk.virtualThreadScheduler.maxPoolSize. Thank you
very much for everyone's help and answers!

Best Regards.
Jianbin Chen, github-id: funky-eyes

Andrew Haley <aph-open at littlepinkcloud.com> ? 2025?7?2??? 16:29???

> On 02/07/2025 05:15, Peter Eastham wrote:
> > As Java 21 is still the current LTS, it isn't completely unreasonable to
> > forward concerns to the mailing list.
>
> Sure, we'e happy to talk about it, but as far as this group is concerned
> the issue has been resolved.
>
> Andrew.
>
>
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From alan.bateman at oracle.com  Wed Jul  2 09:18:16 2025
From: alan.bateman at oracle.com (Alan Bateman)
Date: Wed, 2 Jul 2025 10:18:16 +0100
Subject: Virtual threads created more platform threads
In-Reply-To: <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
Message-ID: <25561a41-7234-4cbf-a7f8-3f88a9b84e99@oracle.com>



On 02/07/2025 09:27, Andrew Haley wrote:
> On 02/07/2025 05:15, Peter Eastham wrote:
>> As Java 21 is still the current LTS, it isn't completely unreasonable to
>> forward concerns to the mailing list.
>
> Sure, we'e happy to talk about it, but as far as this group is 
> concerned the issue has been resolved.

Right, and as a reminder: the changes were to the lightweight locking 
mode only (not legacy) and that mode only became the default in JDK 22. 
There is also a prerequisite spec change to JVMTI GetObjectMonitorUsage 
that happened in JDK 23. It also seems pointless given that JDK 24 is 
already released and JDK 25 is very close.

-Alan

From duke at openjdk.org  Wed Jul  2 16:48:34 2025
From: duke at openjdk.org (duke)
Date: Wed, 2 Jul 2025 16:48:34 GMT
Subject: git: openjdk/loom: fibers: 54 new changesets
Message-ID: <7adbfc8e-db33-417f-a792-6b2a526ab6df@openjdk.org>

Changeset: d8f9b188
Branch: fibers
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2025-06-27 11:20:49 +0000
URL:       https://git.openjdk.org/loom/commit/d8f9b188fa488c9c6e343c62a148cfe9fc8a563b

8268406: Deallocate jmethodID native memory

Reviewed-by: dholmes, sspitsyn, dcubed, eosterlund, aboldtch

! src/hotspot/share/classfile/classLoaderData.cpp
! src/hotspot/share/classfile/classLoaderData.hpp
! src/hotspot/share/memory/universe.cpp
! src/hotspot/share/nmt/memTag.hpp
! src/hotspot/share/oops/instanceKlass.cpp
! src/hotspot/share/oops/instanceKlass.hpp
! src/hotspot/share/oops/instanceKlass.inline.hpp
+ src/hotspot/share/oops/jmethodIDTable.cpp
+ src/hotspot/share/oops/jmethodIDTable.hpp
! src/hotspot/share/oops/method.cpp
! src/hotspot/share/oops/method.hpp
! src/hotspot/share/prims/jniCheck.cpp
! src/hotspot/share/prims/jvmtiEnv.cpp
! src/hotspot/share/prims/jvmtiRedefineClasses.cpp
! src/hotspot/share/runtime/mutexLocker.cpp
+ test/hotspot/gtest/oops/test_jmethodIDTable.cpp

Changeset: ecd2d830
Branch: fibers
Author:    Evgeny Astigeevich <eastigeevich at openjdk.org>
Date:      2025-06-27 12:49:20 +0000
URL:       https://git.openjdk.org/loom/commit/ecd2d83096a1fea7d5086736306770bcffa4fdb6

8359435: AArch64: add support for SB instruction to MacroAssembler::spin_wait

Reviewed-by: shade, aph

! src/hotspot/cpu/aarch64/assembler_aarch64.hpp
! src/hotspot/cpu/aarch64/globals_aarch64.hpp
! src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
! src/hotspot/cpu/aarch64/spin_wait_aarch64.hpp
! src/hotspot/cpu/aarch64/vm_version_aarch64.cpp
! src/hotspot/cpu/aarch64/vm_version_aarch64.hpp
! src/hotspot/os_cpu/bsd_aarch64/vm_version_bsd_aarch64.cpp
! src/hotspot/os_cpu/linux_aarch64/vm_version_linux_aarch64.cpp
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/aarch64/AArch64.java
! test/hotspot/gtest/aarch64/aarch64-asmtest.py
! test/hotspot/gtest/aarch64/asmtest.out.h
! test/hotspot/jtreg/compiler/onSpinWait/TestOnSpinWaitAArch64.java

Changeset: 839cede1
Branch: fibers
Author:    Shaojin Wen <swen at openjdk.org>
Date:      2025-06-27 14:06:12 +0000
URL:       https://git.openjdk.org/loom/commit/839cede1a46b05d27abeaffbbd82c241910035cd

8357289: Break down the String constructor into smaller methods

Reviewed-by: liach, rriggs

! src/java.base/share/classes/java/lang/String.java

Changeset: a471fe99
Branch: fibers
Author:    Artur Barashev <abarashev at openjdk.org>
Date:      2025-06-27 14:15:55 +0000
URL:       https://git.openjdk.org/loom/commit/a471fe992fc0d71ba65b5fdbcc44b97a2783b90a

8360539: DTLS handshakes fails due to improper cookie validation logic

Reviewed-by: ascarpino, hchao

! src/java.base/share/classes/sun/security/ssl/HelloCookieManager.java

Changeset: 12196baf
Branch: fibers
Author:    Kevin Walls <kevinw at openjdk.org>
Date:      2025-06-27 14:54:12 +0000
URL:       https://git.openjdk.org/loom/commit/12196baf6700d00c244747cfa22767e532a4a963

8358624: ImmutableDescriptor violates equals/hashCode contract after deserialization

Reviewed-by: cjplummer, sspitsyn

! src/java.management/share/classes/javax/management/ImmutableDescriptor.java
+ test/jdk/javax/management/descriptor/ImmutableDescriptorSerialHashCodeTest.java

Changeset: 4edf791a
Branch: fibers
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2025-06-27 16:11:41 +0000
URL:       https://git.openjdk.org/loom/commit/4edf791aecd432ecde00652acfaabddf136f4ca7

8295851: Do not use ttyLock in BytecodeTracer::trace

Reviewed-by: dholmes, matsaave

! src/hotspot/share/interpreter/bytecodeTracer.cpp
! test/hotspot/jtreg/runtime/interpreter/TraceBytecodes.java

Changeset: da7080ff
Branch: fibers
Author:    Alisen Chung <achung at openjdk.org>
Date:      2025-06-27 16:13:03 +0000
URL:       https://git.openjdk.org/loom/commit/da7080fffb2389465dc9afca6d02e9085fe15302

8359761: JDK 25 RDP1 L10n resource files update

Reviewed-by: aivanov, almatvee, nbenalla, jlu, dnguyen, cstein, naoto

! src/demo/share/jfc/SwingSet2/resources/swingset_de.properties
! src/java.base/share/classes/sun/launcher/resources/launcher_de.properties
! src/java.base/share/classes/sun/launcher/resources/launcher_ja.properties
! src/java.base/share/classes/sun/launcher/resources/launcher_zh_CN.properties
! src/java.base/share/classes/sun/security/tools/keytool/resources/keytool_de.properties
! src/java.base/share/classes/sun/security/tools/keytool/resources/keytool_ja.properties
! src/java.base/share/classes/sun/security/tools/keytool/resources/keytool_zh_CN.properties
! src/java.base/share/classes/sun/security/util/resources/auth_zh_CN.properties
! src/java.base/share/classes/sun/security/util/resources/security_ja.properties
! src/java.base/share/classes/sun/security/util/resources/security_zh_CN.properties
! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLSchemaMessages_de.properties
! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLSchemaMessages_ja.properties
! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLSchemaMessages_zh_CN.properties
! src/java.xml/share/classes/com/sun/org/apache/xpath/internal/res/XPATHErrorResources_de.java
! src/java.xml/share/classes/com/sun/org/apache/xpath/internal/res/XPATHErrorResources_ja.java
! src/java.xml/share/classes/com/sun/org/apache/xpath/internal/res/XPATHErrorResources_zh_CN.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler_de.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler_ja.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler_zh_CN.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac_de.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac_ja.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac_zh_CN.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/launcher_de.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/launcher_ja.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/launcher_zh_CN.properties
! src/jdk.compiler/share/classes/sun/tools/serialver/resources/serialver_de.properties
! src/jdk.compiler/share/classes/sun/tools/serialver/resources/serialver_ja.properties
! src/jdk.compiler/share/classes/sun/tools/serialver/resources/serialver_zh_CN.properties
! src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner_de.properties
! src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner_ja.properties
! src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner_zh_CN.properties
! src/jdk.jartool/share/classes/sun/tools/jar/resources/jar_de.properties
! src/jdk.jartool/share/classes/sun/tools/jar/resources/jar_ja.properties
! src/jdk.jartool/share/classes/sun/tools/jar/resources/jar_zh_CN.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard_de.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard_ja.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard_zh_CN.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/doclets_de.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/doclets_ja.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/doclets_zh_CN.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc_de.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc_ja.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc_zh_CN.properties
! src/jdk.jconsole/share/classes/sun/tools/jconsole/resources/messages_de.properties
! src/jdk.jdi/share/classes/com/sun/tools/example/debug/tty/TTYResources_de.java
+ src/jdk.jlink/share/classes/jdk/tools/jimage/resources/jimage_de.properties
+ src/jdk.jlink/share/classes/jdk/tools/jimage/resources/jimage_ja.properties
+ src/jdk.jlink/share/classes/jdk/tools/jimage/resources/jimage_zh_CN.properties
! src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink_de.properties
! src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink_ja.properties
! src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink_zh_CN.properties
! src/jdk.jlink/share/classes/jdk/tools/jmod/resources/jmod_de.properties
! src/jdk.jpackage/linux/classes/jdk/jpackage/internal/resources/LinuxResources_de.properties
! src/jdk.jpackage/linux/classes/jdk/jpackage/internal/resources/LinuxResources_ja.properties
! src/jdk.jpackage/linux/classes/jdk/jpackage/internal/resources/LinuxResources_zh_CN.properties
! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/resources/MacResources_de.properties
! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/resources/MacResources_ja.properties
! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/resources/MacResources_zh_CN.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/HelpResources_de.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_de.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_ja.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_zh_CN.properties
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/MsiInstallerStrings_de.wxl
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/MsiInstallerStrings_ja.wxl
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/MsiInstallerStrings_zh_CN.wxl
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/WinResources_de.properties
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/WinResources_ja.properties
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/WinResources_zh_CN.properties
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n_de.properties
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n_ja.properties
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n_zh_CN.properties

Changeset: 712d866b
Branch: fibers
Author:    Chris Plummer <cjplummer at openjdk.org>
Date:      2025-06-27 17:19:22 +0000
URL:       https://git.openjdk.org/loom/commit/712d866b72b43c839c57c3303dfb215f94c0db3b

8360312: Serviceability Agent tests fail with JFR enabled due to unknown thread type JfrRecorderThread

Reviewed-by: sspitsyn, kevinw, dholmes

! src/hotspot/share/jfr/recorder/service/jfrRecorderThread.cpp
! src/hotspot/share/jfr/recorder/service/jfrRecorderThread.hpp
! src/hotspot/share/runtime/vmStructs.cpp
! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/Threads.java
! test/hotspot/jtreg/serviceability/sa/ClhsdbJstackWithConcurrentLock.java

Changeset: 3525a40f
Branch: fibers
Author:    Archie Cobbs <acobbs at openjdk.org>
Date:      2025-06-27 18:25:27 +0000
URL:       https://git.openjdk.org/loom/commit/3525a40f39a966b8592f694a9b3cd4c5dc449266

8359596: Behavior change when both -Xlint:options and -Xlint:-options flags are given

Reviewed-by: mcimadamore, uschindler

! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Lint.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/main/Arguments.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/Options.java
+ test/langtools/tools/javac/lint/LintOptions.java
+ test/langtools/tools/javac/lint/LintOptions.out

Changeset: a23de2ec
Branch: fibers
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-06-27 19:10:02 +0000
URL:       https://git.openjdk.org/loom/commit/a23de2ec090628b52532ee5d9bd4364a97499f5b

8360478: libjsig related tier3 jtreg tests fail when asan is configured

Reviewed-by: dholmes, ihse

! make/data/asan/asan_default_options.c

Changeset: 240541e1
Branch: fibers
Author:    Sergey Bylokhov <serb at openjdk.org>
Date:      2025-06-29 19:44:01 +0000
URL:       https://git.openjdk.org/loom/commit/240541e1c1e3aee633da08e7d12117b8ea38b8f4

8359266: Delete the usage of AppContext in the GraphicsDevice

Reviewed-by: aivanov, azvegint

! src/java.desktop/share/classes/java/awt/GraphicsDevice.java
+ test/jdk/java/awt/GraphicsDevice/FullScreenWindowRace.java

Changeset: 4dd1b3a6
Branch: fibers
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-06-30 01:58:54 +0000
URL:       https://git.openjdk.org/loom/commit/4dd1b3a6100f9e379c7cee3c699d63d0d01144a7

8330940: Impossible to create a socket backlog greater than 200 on Windows 8+

Reviewed-by: michaelm, dfuchs, alanb

! src/java.base/windows/native/libnio/ch/Net.c
+ test/jdk/java/net/ServerSocket/LargeBacklogTest.java

Changeset: c2d76f98
Branch: fibers
Author:    Tobias Hartmann <thartmann at openjdk.org>
Date:      2025-06-30 05:41:37 +0000
URL:       https://git.openjdk.org/loom/commit/c2d76f9844aadf77a0b213a9169a7c5c8c8f1ffb

8361032: Problem list TestOnSpinWaitAArch64 until JDK-8360936 is fixed

Reviewed-by: alanb

! test/hotspot/jtreg/ProblemList.txt

Changeset: 00adbbe5
Branch: fibers
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-06-30 11:22:46 +0000
URL:       https://git.openjdk.org/loom/commit/00adbbe5538ec5c26dc5bd17ca94cc29db9bc478

8274051: Remove supports_vtime()/elapsedVTime()

Reviewed-by: kbarrett, iwalulya

! src/hotspot/os/aix/os_aix.cpp
! src/hotspot/os/bsd/os_bsd.cpp
! src/hotspot/os/linux/os_linux.cpp
! src/hotspot/os/posix/os_posix.cpp
! src/hotspot/os/windows/os_windows.cpp
! src/hotspot/share/gc/g1/g1CollectedHeap.cpp
! src/hotspot/share/gc/g1/g1CollectedHeap.hpp
! src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
! src/hotspot/share/gc/g1/g1ConcurrentMark.hpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.cpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.hpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.inline.hpp
! src/hotspot/share/gc/g1/g1ConcurrentRefineThread.cpp
! src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp
! src/hotspot/share/gc/g1/g1RemSetSummary.cpp
! src/hotspot/share/gc/g1/g1RemSetSummary.hpp
! src/hotspot/share/gc/g1/g1ServiceThread.cpp
! src/hotspot/share/gc/g1/g1ServiceThread.hpp
! src/hotspot/share/runtime/os.hpp

Changeset: aa191119
Branch: fibers
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-06-30 12:55:36 +0000
URL:       https://git.openjdk.org/loom/commit/aa1911191cf8c2b855268a76baf0757909d66d1b

8360867: CTW: Disable inline cache verification

Reviewed-by: kvn, thartmann

! src/hotspot/share/code/codeCache.cpp
! src/hotspot/share/runtime/globals.hpp
! test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java

Changeset: 1dda79cf
Branch: fibers
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-06-30 17:51:20 +0000
URL:       https://git.openjdk.org/loom/commit/1dda79cfab597782e0a7bb63af6dcc30aeff62d1

8360743: Enables regeneration of JLI holder classes for CDS static dump

Reviewed-by: iklam, liach

! src/hotspot/share/cds/aotArtifactFinder.cpp
! src/hotspot/share/cds/aotClassInitializer.cpp
! src/hotspot/share/cds/archiveBuilder.cpp
! src/hotspot/share/cds/archiveHeapWriter.cpp
! src/hotspot/share/cds/cdsConfig.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/cds/lambdaFormInvokers.cpp
! src/hotspot/share/cds/regeneratedClasses.cpp
! src/hotspot/share/cds/regeneratedClasses.hpp
! src/hotspot/share/classfile/systemDictionaryShared.cpp
! src/hotspot/share/oops/instanceKlass.hpp
! test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/NestHostOldInf.java

Changeset: 9d518b32
Branch: fibers
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-06-30 17:52:28 +0000
URL:       https://git.openjdk.org/loom/commit/9d518b3213af7c60cb604138a2c4022181bb2daa

8310831: Some methods are missing from CDS regenerated JLI holder class

Reviewed-by: iklam, liach

! src/hotspot/share/cds/regeneratedClasses.cpp

Changeset: 61a590e9
Branch: fibers
Author:    Xueming Shen <sherman at openjdk.org>
Date:      2025-07-01 00:58:43 +0000
URL:       https://git.openjdk.org/loom/commit/61a590e9bea64ddfd465a5e6f224bc2979d841e9

8354490: Pattern.CANON_EQ causes a pattern to not match a string with a UNICODE variation

Reviewed-by: rriggs, naoto

! src/java.base/share/classes/java/util/regex/Pattern.java
! test/jdk/java/util/regex/RegExTest.java

Changeset: d1052c70
Branch: fibers
Author:    Anass Baya <abaya at openjdk.org>
Committer: Abhishek Kumar <abhiscxk at openjdk.org>
Date:      2025-07-01 04:40:43 +0000
URL:       https://git.openjdk.org/loom/commit/d1052c70cbddb025e7f5b71bd61176e63277bba0

8355478: DoubleActionESC.java fails intermittently

Reviewed-by: aivanov, abhiscxk

! test/jdk/ProblemList.txt
! test/jdk/java/awt/FileDialog/DoubleActionESC.java

Changeset: 0572b6ec
Branch: fibers
Author:    Martin Doerr <mdoerr at openjdk.org>
Date:      2025-07-01 06:09:50 +0000
URL:       https://git.openjdk.org/loom/commit/0572b6ece7a77d13d23ac0c6d72d4fe5d5f0d944

8360887: (fs) Files.getFileAttributeView returns unusable FileAttributeView if UserDefinedFileAttributeView unavailable (aix)

Co-authored-by: Joachim Kern <jkern at openjdk.org>
Reviewed-by: bpb, mbaesken

! src/java.base/aix/classes/sun/nio/fs/AixFileSystemProvider.java
! test/jdk/java/nio/file/FileStore/Basic.java

Changeset: b32ccf2c
Branch: fibers
Author:    Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-01 06:47:48 +0000
URL:       https://git.openjdk.org/loom/commit/b32ccf2cb23e0180187f4238140583a923fc27c4

8361092: Remove trailing spaces in x86 ad files

Reviewed-by: kvn, sviswanathan

! src/hotspot/cpu/x86/x86_64.ad

Changeset: cd6caedd
Branch: fibers
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-07-01 07:58:12 +0000
URL:       https://git.openjdk.org/loom/commit/cd6caedd0a3c9ebd4c8c57e64f62b60161c5cd7c

8360783: CTW: Skip deoptimization between tiers

Reviewed-by: thartmann, mhaessig, dfenacci

! test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/Compiler.java

Changeset: 54c95cf2
Branch: fibers
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-07-01 09:19:35 +0000
URL:       https://git.openjdk.org/loom/commit/54c95cf2261f871c47b3700ede31390c8f5e77dd

8361043: [ubsan] os::print_hex_dump runtime error: applying non-zero offset 8 to null pointer

Reviewed-by: mdoerr, lucy

! src/hotspot/share/runtime/os.cpp

Changeset: aeca49e4
Branch: fibers
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-07-01 09:56:42 +0000
URL:       https://git.openjdk.org/loom/commit/aeca49e43fab951c2031895fee32703fb4a19524

8360791: [ubsan] Adjust signal handling

Reviewed-by: ihse, lucy

! make/data/ubsan/ubsan_default_options.c

Changeset: fc739fee
Branch: fibers
Author:    Albert Mingkun Yang <ayang at openjdk.org>
Date:      2025-07-01 10:13:17 +0000
URL:       https://git.openjdk.org/loom/commit/fc739fee5360ec052c2b51b3e30ce1c34df71714

8360206: Refactor ReferenceProcessor::balance_queues

Reviewed-by: sangheki, kbarrett, tschatzl

! src/hotspot/share/gc/shared/referenceProcessor.cpp

Changeset: eec11539
Branch: fibers
Author:    Albert Mingkun Yang <ayang at openjdk.org>
Date:      2025-07-01 10:14:25 +0000
URL:       https://git.openjdk.org/loom/commit/eec1153993a2a6e65b05e6d9d7416ee0cb634503

8361056: Parallel: Use correct is_par argument in ScavengeRootsTask

Reviewed-by: tschatzl

! src/hotspot/share/gc/parallel/psScavenge.cpp

Changeset: e85c7d09
Branch: fibers
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-01 10:40:33 +0000
URL:       https://git.openjdk.org/loom/commit/e85c7d09df67728ddcf852a96e5b2baa57c502f1

8360790: G1: Improve HRRSStatsIter name

Reviewed-by: kbarrett, ayang

! src/hotspot/share/gc/g1/g1RemSetSummary.cpp

Changeset: 7583a7b8
Branch: fibers
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-07-01 11:39:20 +0000
URL:       https://git.openjdk.org/loom/commit/7583a7b857da053c5e3770b680ab3494f1a6b66a

8359337: XML/JAXP tests that make network connections should ensure that no proxy is selected

Reviewed-by: lancea, iris, joehw

! test/jaxp/javax/xml/jaxp/unittest/common/catalog/DOMTest.java
! test/jaxp/javax/xml/jaxp/unittest/common/catalog/SAXTest.java
! test/jaxp/javax/xml/jaxp/unittest/common/dtd/DOMTest.java
! test/jaxp/javax/xml/jaxp/unittest/common/dtd/SAXTest.java
! test/jaxp/javax/xml/jaxp/unittest/dom/DOMFeatureTest.java

Changeset: e1382973
Branch: fibers
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-07-01 14:30:20 +0000
URL:       https://git.openjdk.org/loom/commit/e138297323de3f6990c4c536b1cefd209ce3a69c

8359436: AOTCompileEagerly should not be diagnostic

Reviewed-by: kvn, syan, dholmes

! src/hotspot/share/cds/cds_globals.hpp
+ test/hotspot/jtreg/runtime/cds/appcds/aotCache/AOTCompileEagerly.java

Changeset: e1681c48
Branch: fibers
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-07-01 15:32:26 +0000
URL:       https://git.openjdk.org/loom/commit/e1681c48287bcce6c8f617d9c0c25354dd62870a

8359477: com/sun/net/httpserver/Test12.java appears to have a temp file race

Reviewed-by: dfuchs, vyazici

! test/jdk/com/sun/net/httpserver/FileServerHandler.java
! test/jdk/com/sun/net/httpserver/Test12.java

Changeset: 38f59f84
Branch: fibers
Author:    Mohamed Issa <missa at openjdk.org>
Committer: Sandhya Viswanathan <sviswanathan at openjdk.org>
Date:      2025-07-01 15:34:37 +0000
URL:       https://git.openjdk.org/loom/commit/38f59f84c98dfd974eec0c05541b2138b149def7

8358179: Performance regression in Math.cbrt

Reviewed-by: sviswanathan, sparasa, epeter

! src/hotspot/cpu/x86/stubGenerator_x86_64_cbrt.cpp

Changeset: e7a45003
Branch: fibers
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2025-07-01 17:14:36 +0000
URL:       https://git.openjdk.org/loom/commit/e7a450038a47a76d2e616ebce2a7fa8a51e36ea4

8359707: Add classfile modification code to RedefineClassHelper

Reviewed-by: lmesnik, dholmes, sspitsyn

! test/hotspot/jtreg/serviceability/jvmti/RedefineClasses/ClassVersionAfterRedefine.java
! test/lib/RedefineClassHelper.java

Changeset: 282ee40a
Branch: fibers
Author:    Leonid Mesnik <lmesnik at openjdk.org>
Date:      2025-07-01 17:22:33 +0000
URL:       https://git.openjdk.org/loom/commit/282ee40a56af46521b94fe6e4c90e78b8f513b29

8359366: RunThese30M.java EXCEPTION_ACCESS_VIOLATION in JvmtiBreakpoints::clearall_in_class_at_safepoint

Reviewed-by: coleenp, dholmes, sspitsyn

! src/hotspot/share/prims/jvmtiImpl.cpp

Changeset: 13a39278
Branch: fibers
Author:    Kevin Walls <kevinw at openjdk.org>
Date:      2025-07-01 19:07:49 +0000
URL:       https://git.openjdk.org/loom/commit/13a3927855da61fe27f3b43e5e4755d0c5ac5a16

8359870: JVM crashes in AccessInternal::PostRuntimeDispatch

Reviewed-by: amenkov, dholmes, sspitsyn

! src/hotspot/share/prims/jvm.cpp
! src/hotspot/share/services/threadService.cpp
! src/java.base/share/classes/jdk/internal/vm/ThreadDumper.java
! src/java.base/share/classes/jdk/internal/vm/ThreadSnapshot.java
! test/jdk/com/sun/management/HotSpotDiagnosticMXBean/DumpThreadsWithEliminatedLock.java

Changeset: e9a62d79
Branch: fibers
Author:    Daniel Jeli?ski <djelinski at openjdk.org>
Date:      2025-07-01 19:19:25 +0000
URL:       https://git.openjdk.org/loom/commit/e9a62d79cdc43e5eb141f1d47624d0f6fe05989d

8361125: Fix typo in onTradAbsence

Reviewed-by: hchao, mullan, shade

! src/java.base/share/classes/sun/security/ssl/KeyShareExtension.java
! src/java.base/share/classes/sun/security/ssl/PreSharedKeyExtension.java
! src/java.base/share/classes/sun/security/ssl/SSLExtension.java
! src/java.base/share/classes/sun/security/ssl/SupportedGroupsExtension.java

Changeset: 534d2b33
Branch: fibers
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-07-01 19:52:06 +0000
URL:       https://git.openjdk.org/loom/commit/534d2b33dc23d0171fdce3cb89d679d5088b4667

8357064: cds/appcds/ArchiveRelocationTest.java failed with missing expected output

Reviewed-by: shade, iklam

! test/hotspot/jtreg/runtime/cds/appcds/ArchiveRelocationTest.java

Changeset: 7d7e60c8
Branch: fibers
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-01 20:22:13 +0000
URL:       https://git.openjdk.org/loom/commit/7d7e60c8aebc4b4c1e7121be702393e5bc46e9ce

8360164: AOT cache creation crashes in ~ThreadTotalCPUTimeClosure()

Reviewed-by: ccheung, kvn, dholmes

! src/hotspot/share/cds/metaspaceShared.cpp

Changeset: a910b20b
Branch: fibers
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-02 00:17:19 +0000
URL:       https://git.openjdk.org/loom/commit/a910b20b51157d8f36418bd60b328193ebfb502e

8346914: UB issue in scalbnA

Reviewed-by: aph, tschatzl

! src/hotspot/cpu/aarch64/macroAssembler_aarch64_trig.cpp
! src/hotspot/share/runtime/sharedRuntimeMath.hpp
! src/hotspot/share/runtime/sharedRuntimeTrans.cpp
! src/hotspot/share/runtime/sharedRuntimeTrig.cpp

Changeset: 1703915d
Branch: fibers
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-02 00:25:26 +0000
URL:       https://git.openjdk.org/loom/commit/1703915d3fe3608ca558671814f78d9dcf5886e6

8361085: MemoryReserver log_on_large_pages_failure has incorrect format usage

Reviewed-by: stefank, dholmes

! src/hotspot/share/memory/memoryReserver.cpp

Changeset: c6448dc3
Branch: fibers
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-02 00:28:24 +0000
URL:       https://git.openjdk.org/loom/commit/c6448dc3afb1da9d93bb94804aa1971a650b91b7

8361086: JVMCIGlobals::check_jvmci_flags_are_consistent has incorrect format string

Reviewed-by: kvn, mhaessig, yzheng

! src/hotspot/share/jvmci/jvmci_globals.cpp

Changeset: 2bff8e0a
Branch: fibers
Author:    Prasanta Sadhukhan <psadhukhan at openjdk.org>
Date:      2025-07-02 03:07:07 +0000
URL:       https://git.openjdk.org/loom/commit/2bff8e0a1382f8820bc2479af87e45dc6b74cdb5

8360462: [macosx] row selection not working with Ctrl+Shift+Down/Up in AquaL&F

Reviewed-by: dnguyen, abhiscxk

! src/java.desktop/macosx/classes/com/apple/laf/AquaKeyBindings.java
+ test/jdk/javax/swing/JTree/TestTreeRowSelection.java

Changeset: 055d2ffa
Branch: fibers
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-02 04:24:55 +0000
URL:       https://git.openjdk.org/loom/commit/055d2ffa69e129b7617369e268f272517f25e2d7

8361215: Add AOT test case: verification constraint classes are excluded

Reviewed-by: ccheung

! test/hotspot/jtreg/TEST.groups
! test/hotspot/jtreg/runtime/cds/appcds/aotCache/ExcludedClasses.java
! test/lib/jdk/test/lib/cds/CDSAppTester.java

Changeset: 1ac74898
Branch: fibers
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-07-02 05:38:28 +0000
URL:       https://git.openjdk.org/loom/commit/1ac74898745ce9b109db5571d9dcbd907dd05831

8361180: Disable CompiledDirectCall verification with -VerifyInlineCaches

Reviewed-by: kvn, thartmann

! src/hotspot/share/code/compiledIC.hpp

Changeset: 0f1cd987
Branch: fibers
Author:    Anton Artemov <anton.artemov at oracle.com>
Committer: David Holmes <dholmes at openjdk.org>
Date:      2025-07-02 06:49:36 +0000
URL:       https://git.openjdk.org/loom/commit/0f1cd987b3520eaeab31e9faf782d6f81050803a

8284016: Normalize handshake closure names

Reviewed-by: coleenp, sspitsyn

! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/z/zMark.cpp
! src/hotspot/share/prims/scopedMemoryAccess.cpp
! src/hotspot/share/prims/whitebox.cpp
! src/hotspot/share/runtime/deoptimization.cpp
! src/hotspot/share/runtime/escapeBarrier.cpp
! src/hotspot/share/runtime/handshake.cpp
! src/hotspot/share/runtime/handshake.hpp
! src/hotspot/share/runtime/javaThread.cpp
! src/hotspot/share/runtime/javaThread.hpp
! src/hotspot/share/runtime/javaThread.inline.hpp
! src/hotspot/share/runtime/suspendResumeManager.cpp
! src/hotspot/share/runtime/suspendResumeManager.hpp
! src/hotspot/share/runtime/synchronizer.cpp
! src/hotspot/share/runtime/vmThread.cpp
! src/hotspot/share/services/threadService.cpp

Changeset: 2304044a
Branch: fibers
Author:    Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-02 08:35:51 +0000
URL:       https://git.openjdk.org/loom/commit/2304044ab2f228fe2fe4adb5975291e733b12d5c

8360641: TestCompilerCounts fails after 8354727

Reviewed-by: kvn, dfenacci, mdoerr

! test/hotspot/jtreg/compiler/arguments/TestCompilerCounts.java

Changeset: eac8f5d2
Branch: fibers
Author:    Saranya Natarajan <snatarajan at openjdk.org>
Committer: Daniel Lund?n <dlunden at openjdk.org>
Date:      2025-07-02 08:38:31 +0000
URL:       https://git.openjdk.org/loom/commit/eac8f5d2c99e1bcc526da0f6a05af76e815c2db9

8325478: Restructure the macro expansion compiler phase to not include macro elimination

Reviewed-by: kvn, dlunden

! src/hotspot/share/opto/c2_globals.hpp
! src/hotspot/share/opto/compile.cpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/opto/macro.hpp
! src/hotspot/share/opto/phasetype.hpp
! src/utils/IdealGraphVisualizer/README.md
! test/hotspot/jtreg/compiler/arguments/TestStressOptions.java
! test/hotspot/jtreg/compiler/debug/TestGenerateStressSeed.java
! test/hotspot/jtreg/compiler/debug/TestStress.java
! test/hotspot/jtreg/compiler/lib/ir_framework/CompilePhase.java
! test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java

Changeset: ce998699
Branch: fibers
Author:    Taizo Kurashige <tkurashige at openjdk.org>
Committer: Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-02 09:21:57 +0000
URL:       https://git.openjdk.org/loom/commit/ce9986991d60e116ac6680a1b6a4b3ee5384d105

8359120: Improve warning message when fail to load hsdis library

Reviewed-by: mhaessig, thartmann

! src/hotspot/share/code/nmethod.cpp
! src/hotspot/share/compiler/abstractDisassembler.cpp

Changeset: 11c13187
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-02 15:52:44 +0000
URL:       https://git.openjdk.org/loom/commit/11c1318773b40e26f5b03a34623c0df54a2c9956

Merge branch 'master' into fibers

! src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/memory/universe.cpp
! src/hotspot/share/oops/instanceKlass.cpp
! src/hotspot/share/oops/instanceKlass.hpp
! src/hotspot/share/runtime/globals.hpp
! src/hotspot/share/runtime/javaThread.cpp
! src/hotspot/share/runtime/javaThread.hpp
! src/hotspot/share/runtime/synchronizer.cpp
! test/hotspot/jtreg/ProblemList.txt
! test/hotspot/jtreg/TEST.groups
! src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/memory/universe.cpp
! src/hotspot/share/oops/instanceKlass.cpp
! src/hotspot/share/oops/instanceKlass.hpp
! src/hotspot/share/runtime/globals.hpp
! src/hotspot/share/runtime/javaThread.cpp
! src/hotspot/share/runtime/javaThread.hpp
! src/hotspot/share/runtime/synchronizer.cpp
! test/hotspot/jtreg/ProblemList.txt
! test/hotspot/jtreg/TEST.groups

Changeset: 34c61011
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-02 15:51:03 +0000
URL:       https://git.openjdk.org/loom/commit/34c61011b9d846c0bedf5e5e35bc330d319991cd

Improve readme page

! loom-docs/CustomSchedulers.md

Changeset: 6a254024
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-02 15:51:38 +0000
URL:       https://git.openjdk.org/loom/commit/6a254024bc8ee1803ed801e4a6400cf85b1291bd

Lost signal on aarch64

! src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java

Changeset: 73f947f1
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-02 15:52:53 +0000
URL:       https://git.openjdk.org/loom/commit/73f947f15768c3818a57c4c8bd2af5b6a22a8dbf

Merge loom into fibers


Changeset: 3066a67e
Branch: fibers
Author:    Ashutosh Mehra <asmehra at openjdk.org>
Date:      2025-07-02 13:25:00 +0000
URL:       https://git.openjdk.org/loom/commit/3066a67e6279f7e3896ab545bc6c291d279d2b03

8361101: AOTCodeAddressTable::_stubs_addr not initialized/freed properly

Reviewed-by: kvn, shade

! src/hotspot/share/code/aotCodeCache.cpp
! src/hotspot/share/code/aotCodeCache.hpp

Changeset: 832bfbc0
Branch: fibers
Author:    Albert Mingkun Yang <ayang at openjdk.org>
Date:      2025-07-02 13:39:16 +0000
URL:       https://git.openjdk.org/loom/commit/832bfbc0ddcf3068bab5d45d361803152736383f

8338474: Parallel: Deprecate and obsolete PSChunkLargeArrays

Reviewed-by: tschatzl, kbarrett

! src/hotspot/share/gc/parallel/parallel_globals.hpp
! src/hotspot/share/runtime/arguments.cpp

Changeset: 9c06b080
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-02 15:53:44 +0000
URL:       https://git.openjdk.org/loom/commit/9c06b08026086226688d268095c1f1f814c8a33d

Merge branch 'master' into fibers



From duke at openjdk.org  Wed Jul  2 16:51:26 2025
From: duke at openjdk.org (duke)
Date: Wed, 2 Jul 2025 16:51:26 GMT
Subject: git: openjdk/loom: master: 49 new changesets
Message-ID: <97be2125-4fca-4cff-8d0b-76fbcd99a758@openjdk.org>

Changeset: d8f9b188
Branch: master
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2025-06-27 11:20:49 +0000
URL:       https://git.openjdk.org/loom/commit/d8f9b188fa488c9c6e343c62a148cfe9fc8a563b

8268406: Deallocate jmethodID native memory

Reviewed-by: dholmes, sspitsyn, dcubed, eosterlund, aboldtch

! src/hotspot/share/classfile/classLoaderData.cpp
! src/hotspot/share/classfile/classLoaderData.hpp
! src/hotspot/share/memory/universe.cpp
! src/hotspot/share/nmt/memTag.hpp
! src/hotspot/share/oops/instanceKlass.cpp
! src/hotspot/share/oops/instanceKlass.hpp
! src/hotspot/share/oops/instanceKlass.inline.hpp
+ src/hotspot/share/oops/jmethodIDTable.cpp
+ src/hotspot/share/oops/jmethodIDTable.hpp
! src/hotspot/share/oops/method.cpp
! src/hotspot/share/oops/method.hpp
! src/hotspot/share/prims/jniCheck.cpp
! src/hotspot/share/prims/jvmtiEnv.cpp
! src/hotspot/share/prims/jvmtiRedefineClasses.cpp
! src/hotspot/share/runtime/mutexLocker.cpp
+ test/hotspot/gtest/oops/test_jmethodIDTable.cpp

Changeset: ecd2d830
Branch: master
Author:    Evgeny Astigeevich <eastigeevich at openjdk.org>
Date:      2025-06-27 12:49:20 +0000
URL:       https://git.openjdk.org/loom/commit/ecd2d83096a1fea7d5086736306770bcffa4fdb6

8359435: AArch64: add support for SB instruction to MacroAssembler::spin_wait

Reviewed-by: shade, aph

! src/hotspot/cpu/aarch64/assembler_aarch64.hpp
! src/hotspot/cpu/aarch64/globals_aarch64.hpp
! src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
! src/hotspot/cpu/aarch64/spin_wait_aarch64.hpp
! src/hotspot/cpu/aarch64/vm_version_aarch64.cpp
! src/hotspot/cpu/aarch64/vm_version_aarch64.hpp
! src/hotspot/os_cpu/bsd_aarch64/vm_version_bsd_aarch64.cpp
! src/hotspot/os_cpu/linux_aarch64/vm_version_linux_aarch64.cpp
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/aarch64/AArch64.java
! test/hotspot/gtest/aarch64/aarch64-asmtest.py
! test/hotspot/gtest/aarch64/asmtest.out.h
! test/hotspot/jtreg/compiler/onSpinWait/TestOnSpinWaitAArch64.java

Changeset: 839cede1
Branch: master
Author:    Shaojin Wen <swen at openjdk.org>
Date:      2025-06-27 14:06:12 +0000
URL:       https://git.openjdk.org/loom/commit/839cede1a46b05d27abeaffbbd82c241910035cd

8357289: Break down the String constructor into smaller methods

Reviewed-by: liach, rriggs

! src/java.base/share/classes/java/lang/String.java

Changeset: a471fe99
Branch: master
Author:    Artur Barashev <abarashev at openjdk.org>
Date:      2025-06-27 14:15:55 +0000
URL:       https://git.openjdk.org/loom/commit/a471fe992fc0d71ba65b5fdbcc44b97a2783b90a

8360539: DTLS handshakes fails due to improper cookie validation logic

Reviewed-by: ascarpino, hchao

! src/java.base/share/classes/sun/security/ssl/HelloCookieManager.java

Changeset: 12196baf
Branch: master
Author:    Kevin Walls <kevinw at openjdk.org>
Date:      2025-06-27 14:54:12 +0000
URL:       https://git.openjdk.org/loom/commit/12196baf6700d00c244747cfa22767e532a4a963

8358624: ImmutableDescriptor violates equals/hashCode contract after deserialization

Reviewed-by: cjplummer, sspitsyn

! src/java.management/share/classes/javax/management/ImmutableDescriptor.java
+ test/jdk/javax/management/descriptor/ImmutableDescriptorSerialHashCodeTest.java

Changeset: 4edf791a
Branch: master
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2025-06-27 16:11:41 +0000
URL:       https://git.openjdk.org/loom/commit/4edf791aecd432ecde00652acfaabddf136f4ca7

8295851: Do not use ttyLock in BytecodeTracer::trace

Reviewed-by: dholmes, matsaave

! src/hotspot/share/interpreter/bytecodeTracer.cpp
! test/hotspot/jtreg/runtime/interpreter/TraceBytecodes.java

Changeset: da7080ff
Branch: master
Author:    Alisen Chung <achung at openjdk.org>
Date:      2025-06-27 16:13:03 +0000
URL:       https://git.openjdk.org/loom/commit/da7080fffb2389465dc9afca6d02e9085fe15302

8359761: JDK 25 RDP1 L10n resource files update

Reviewed-by: aivanov, almatvee, nbenalla, jlu, dnguyen, cstein, naoto

! src/demo/share/jfc/SwingSet2/resources/swingset_de.properties
! src/java.base/share/classes/sun/launcher/resources/launcher_de.properties
! src/java.base/share/classes/sun/launcher/resources/launcher_ja.properties
! src/java.base/share/classes/sun/launcher/resources/launcher_zh_CN.properties
! src/java.base/share/classes/sun/security/tools/keytool/resources/keytool_de.properties
! src/java.base/share/classes/sun/security/tools/keytool/resources/keytool_ja.properties
! src/java.base/share/classes/sun/security/tools/keytool/resources/keytool_zh_CN.properties
! src/java.base/share/classes/sun/security/util/resources/auth_zh_CN.properties
! src/java.base/share/classes/sun/security/util/resources/security_ja.properties
! src/java.base/share/classes/sun/security/util/resources/security_zh_CN.properties
! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLSchemaMessages_de.properties
! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLSchemaMessages_ja.properties
! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLSchemaMessages_zh_CN.properties
! src/java.xml/share/classes/com/sun/org/apache/xpath/internal/res/XPATHErrorResources_de.java
! src/java.xml/share/classes/com/sun/org/apache/xpath/internal/res/XPATHErrorResources_ja.java
! src/java.xml/share/classes/com/sun/org/apache/xpath/internal/res/XPATHErrorResources_zh_CN.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler_de.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler_ja.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler_zh_CN.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac_de.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac_ja.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac_zh_CN.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/launcher_de.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/launcher_ja.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/launcher_zh_CN.properties
! src/jdk.compiler/share/classes/sun/tools/serialver/resources/serialver_de.properties
! src/jdk.compiler/share/classes/sun/tools/serialver/resources/serialver_ja.properties
! src/jdk.compiler/share/classes/sun/tools/serialver/resources/serialver_zh_CN.properties
! src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner_de.properties
! src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner_ja.properties
! src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner_zh_CN.properties
! src/jdk.jartool/share/classes/sun/tools/jar/resources/jar_de.properties
! src/jdk.jartool/share/classes/sun/tools/jar/resources/jar_ja.properties
! src/jdk.jartool/share/classes/sun/tools/jar/resources/jar_zh_CN.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard_de.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard_ja.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard_zh_CN.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/doclets_de.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/doclets_ja.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/doclets_zh_CN.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc_de.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc_ja.properties
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc_zh_CN.properties
! src/jdk.jconsole/share/classes/sun/tools/jconsole/resources/messages_de.properties
! src/jdk.jdi/share/classes/com/sun/tools/example/debug/tty/TTYResources_de.java
+ src/jdk.jlink/share/classes/jdk/tools/jimage/resources/jimage_de.properties
+ src/jdk.jlink/share/classes/jdk/tools/jimage/resources/jimage_ja.properties
+ src/jdk.jlink/share/classes/jdk/tools/jimage/resources/jimage_zh_CN.properties
! src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink_de.properties
! src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink_ja.properties
! src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink_zh_CN.properties
! src/jdk.jlink/share/classes/jdk/tools/jmod/resources/jmod_de.properties
! src/jdk.jpackage/linux/classes/jdk/jpackage/internal/resources/LinuxResources_de.properties
! src/jdk.jpackage/linux/classes/jdk/jpackage/internal/resources/LinuxResources_ja.properties
! src/jdk.jpackage/linux/classes/jdk/jpackage/internal/resources/LinuxResources_zh_CN.properties
! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/resources/MacResources_de.properties
! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/resources/MacResources_ja.properties
! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/resources/MacResources_zh_CN.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/HelpResources_de.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_de.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_ja.properties
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_zh_CN.properties
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/MsiInstallerStrings_de.wxl
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/MsiInstallerStrings_ja.wxl
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/MsiInstallerStrings_zh_CN.wxl
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/WinResources_de.properties
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/WinResources_ja.properties
! src/jdk.jpackage/windows/classes/jdk/jpackage/internal/resources/WinResources_zh_CN.properties
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n_de.properties
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n_ja.properties
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n_zh_CN.properties

Changeset: 712d866b
Branch: master
Author:    Chris Plummer <cjplummer at openjdk.org>
Date:      2025-06-27 17:19:22 +0000
URL:       https://git.openjdk.org/loom/commit/712d866b72b43c839c57c3303dfb215f94c0db3b

8360312: Serviceability Agent tests fail with JFR enabled due to unknown thread type JfrRecorderThread

Reviewed-by: sspitsyn, kevinw, dholmes

! src/hotspot/share/jfr/recorder/service/jfrRecorderThread.cpp
! src/hotspot/share/jfr/recorder/service/jfrRecorderThread.hpp
! src/hotspot/share/runtime/vmStructs.cpp
! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/Threads.java
! test/hotspot/jtreg/serviceability/sa/ClhsdbJstackWithConcurrentLock.java

Changeset: 3525a40f
Branch: master
Author:    Archie Cobbs <acobbs at openjdk.org>
Date:      2025-06-27 18:25:27 +0000
URL:       https://git.openjdk.org/loom/commit/3525a40f39a966b8592f694a9b3cd4c5dc449266

8359596: Behavior change when both -Xlint:options and -Xlint:-options flags are given

Reviewed-by: mcimadamore, uschindler

! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Lint.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/main/Arguments.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/Options.java
+ test/langtools/tools/javac/lint/LintOptions.java
+ test/langtools/tools/javac/lint/LintOptions.out

Changeset: a23de2ec
Branch: master
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-06-27 19:10:02 +0000
URL:       https://git.openjdk.org/loom/commit/a23de2ec090628b52532ee5d9bd4364a97499f5b

8360478: libjsig related tier3 jtreg tests fail when asan is configured

Reviewed-by: dholmes, ihse

! make/data/asan/asan_default_options.c

Changeset: 240541e1
Branch: master
Author:    Sergey Bylokhov <serb at openjdk.org>
Date:      2025-06-29 19:44:01 +0000
URL:       https://git.openjdk.org/loom/commit/240541e1c1e3aee633da08e7d12117b8ea38b8f4

8359266: Delete the usage of AppContext in the GraphicsDevice

Reviewed-by: aivanov, azvegint

! src/java.desktop/share/classes/java/awt/GraphicsDevice.java
+ test/jdk/java/awt/GraphicsDevice/FullScreenWindowRace.java

Changeset: 4dd1b3a6
Branch: master
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-06-30 01:58:54 +0000
URL:       https://git.openjdk.org/loom/commit/4dd1b3a6100f9e379c7cee3c699d63d0d01144a7

8330940: Impossible to create a socket backlog greater than 200 on Windows 8+

Reviewed-by: michaelm, dfuchs, alanb

! src/java.base/windows/native/libnio/ch/Net.c
+ test/jdk/java/net/ServerSocket/LargeBacklogTest.java

Changeset: c2d76f98
Branch: master
Author:    Tobias Hartmann <thartmann at openjdk.org>
Date:      2025-06-30 05:41:37 +0000
URL:       https://git.openjdk.org/loom/commit/c2d76f9844aadf77a0b213a9169a7c5c8c8f1ffb

8361032: Problem list TestOnSpinWaitAArch64 until JDK-8360936 is fixed

Reviewed-by: alanb

! test/hotspot/jtreg/ProblemList.txt

Changeset: 00adbbe5
Branch: master
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-06-30 11:22:46 +0000
URL:       https://git.openjdk.org/loom/commit/00adbbe5538ec5c26dc5bd17ca94cc29db9bc478

8274051: Remove supports_vtime()/elapsedVTime()

Reviewed-by: kbarrett, iwalulya

! src/hotspot/os/aix/os_aix.cpp
! src/hotspot/os/bsd/os_bsd.cpp
! src/hotspot/os/linux/os_linux.cpp
! src/hotspot/os/posix/os_posix.cpp
! src/hotspot/os/windows/os_windows.cpp
! src/hotspot/share/gc/g1/g1CollectedHeap.cpp
! src/hotspot/share/gc/g1/g1CollectedHeap.hpp
! src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
! src/hotspot/share/gc/g1/g1ConcurrentMark.hpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.cpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.hpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.inline.hpp
! src/hotspot/share/gc/g1/g1ConcurrentRefineThread.cpp
! src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp
! src/hotspot/share/gc/g1/g1RemSetSummary.cpp
! src/hotspot/share/gc/g1/g1RemSetSummary.hpp
! src/hotspot/share/gc/g1/g1ServiceThread.cpp
! src/hotspot/share/gc/g1/g1ServiceThread.hpp
! src/hotspot/share/runtime/os.hpp

Changeset: aa191119
Branch: master
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-06-30 12:55:36 +0000
URL:       https://git.openjdk.org/loom/commit/aa1911191cf8c2b855268a76baf0757909d66d1b

8360867: CTW: Disable inline cache verification

Reviewed-by: kvn, thartmann

! src/hotspot/share/code/codeCache.cpp
! src/hotspot/share/runtime/globals.hpp
! test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java

Changeset: 1dda79cf
Branch: master
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-06-30 17:51:20 +0000
URL:       https://git.openjdk.org/loom/commit/1dda79cfab597782e0a7bb63af6dcc30aeff62d1

8360743: Enables regeneration of JLI holder classes for CDS static dump

Reviewed-by: iklam, liach

! src/hotspot/share/cds/aotArtifactFinder.cpp
! src/hotspot/share/cds/aotClassInitializer.cpp
! src/hotspot/share/cds/archiveBuilder.cpp
! src/hotspot/share/cds/archiveHeapWriter.cpp
! src/hotspot/share/cds/cdsConfig.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/cds/lambdaFormInvokers.cpp
! src/hotspot/share/cds/regeneratedClasses.cpp
! src/hotspot/share/cds/regeneratedClasses.hpp
! src/hotspot/share/classfile/systemDictionaryShared.cpp
! src/hotspot/share/oops/instanceKlass.hpp
! test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/NestHostOldInf.java

Changeset: 9d518b32
Branch: master
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-06-30 17:52:28 +0000
URL:       https://git.openjdk.org/loom/commit/9d518b3213af7c60cb604138a2c4022181bb2daa

8310831: Some methods are missing from CDS regenerated JLI holder class

Reviewed-by: iklam, liach

! src/hotspot/share/cds/regeneratedClasses.cpp

Changeset: 61a590e9
Branch: master
Author:    Xueming Shen <sherman at openjdk.org>
Date:      2025-07-01 00:58:43 +0000
URL:       https://git.openjdk.org/loom/commit/61a590e9bea64ddfd465a5e6f224bc2979d841e9

8354490: Pattern.CANON_EQ causes a pattern to not match a string with a UNICODE variation

Reviewed-by: rriggs, naoto

! src/java.base/share/classes/java/util/regex/Pattern.java
! test/jdk/java/util/regex/RegExTest.java

Changeset: d1052c70
Branch: master
Author:    Anass Baya <abaya at openjdk.org>
Committer: Abhishek Kumar <abhiscxk at openjdk.org>
Date:      2025-07-01 04:40:43 +0000
URL:       https://git.openjdk.org/loom/commit/d1052c70cbddb025e7f5b71bd61176e63277bba0

8355478: DoubleActionESC.java fails intermittently

Reviewed-by: aivanov, abhiscxk

! test/jdk/ProblemList.txt
! test/jdk/java/awt/FileDialog/DoubleActionESC.java

Changeset: 0572b6ec
Branch: master
Author:    Martin Doerr <mdoerr at openjdk.org>
Date:      2025-07-01 06:09:50 +0000
URL:       https://git.openjdk.org/loom/commit/0572b6ece7a77d13d23ac0c6d72d4fe5d5f0d944

8360887: (fs) Files.getFileAttributeView returns unusable FileAttributeView if UserDefinedFileAttributeView unavailable (aix)

Co-authored-by: Joachim Kern <jkern at openjdk.org>
Reviewed-by: bpb, mbaesken

! src/java.base/aix/classes/sun/nio/fs/AixFileSystemProvider.java
! test/jdk/java/nio/file/FileStore/Basic.java

Changeset: b32ccf2c
Branch: master
Author:    Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-01 06:47:48 +0000
URL:       https://git.openjdk.org/loom/commit/b32ccf2cb23e0180187f4238140583a923fc27c4

8361092: Remove trailing spaces in x86 ad files

Reviewed-by: kvn, sviswanathan

! src/hotspot/cpu/x86/x86_64.ad

Changeset: cd6caedd
Branch: master
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-07-01 07:58:12 +0000
URL:       https://git.openjdk.org/loom/commit/cd6caedd0a3c9ebd4c8c57e64f62b60161c5cd7c

8360783: CTW: Skip deoptimization between tiers

Reviewed-by: thartmann, mhaessig, dfenacci

! test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/Compiler.java

Changeset: 54c95cf2
Branch: master
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-07-01 09:19:35 +0000
URL:       https://git.openjdk.org/loom/commit/54c95cf2261f871c47b3700ede31390c8f5e77dd

8361043: [ubsan] os::print_hex_dump runtime error: applying non-zero offset 8 to null pointer

Reviewed-by: mdoerr, lucy

! src/hotspot/share/runtime/os.cpp

Changeset: aeca49e4
Branch: master
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-07-01 09:56:42 +0000
URL:       https://git.openjdk.org/loom/commit/aeca49e43fab951c2031895fee32703fb4a19524

8360791: [ubsan] Adjust signal handling

Reviewed-by: ihse, lucy

! make/data/ubsan/ubsan_default_options.c

Changeset: fc739fee
Branch: master
Author:    Albert Mingkun Yang <ayang at openjdk.org>
Date:      2025-07-01 10:13:17 +0000
URL:       https://git.openjdk.org/loom/commit/fc739fee5360ec052c2b51b3e30ce1c34df71714

8360206: Refactor ReferenceProcessor::balance_queues

Reviewed-by: sangheki, kbarrett, tschatzl

! src/hotspot/share/gc/shared/referenceProcessor.cpp

Changeset: eec11539
Branch: master
Author:    Albert Mingkun Yang <ayang at openjdk.org>
Date:      2025-07-01 10:14:25 +0000
URL:       https://git.openjdk.org/loom/commit/eec1153993a2a6e65b05e6d9d7416ee0cb634503

8361056: Parallel: Use correct is_par argument in ScavengeRootsTask

Reviewed-by: tschatzl

! src/hotspot/share/gc/parallel/psScavenge.cpp

Changeset: e85c7d09
Branch: master
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-01 10:40:33 +0000
URL:       https://git.openjdk.org/loom/commit/e85c7d09df67728ddcf852a96e5b2baa57c502f1

8360790: G1: Improve HRRSStatsIter name

Reviewed-by: kbarrett, ayang

! src/hotspot/share/gc/g1/g1RemSetSummary.cpp

Changeset: 7583a7b8
Branch: master
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-07-01 11:39:20 +0000
URL:       https://git.openjdk.org/loom/commit/7583a7b857da053c5e3770b680ab3494f1a6b66a

8359337: XML/JAXP tests that make network connections should ensure that no proxy is selected

Reviewed-by: lancea, iris, joehw

! test/jaxp/javax/xml/jaxp/unittest/common/catalog/DOMTest.java
! test/jaxp/javax/xml/jaxp/unittest/common/catalog/SAXTest.java
! test/jaxp/javax/xml/jaxp/unittest/common/dtd/DOMTest.java
! test/jaxp/javax/xml/jaxp/unittest/common/dtd/SAXTest.java
! test/jaxp/javax/xml/jaxp/unittest/dom/DOMFeatureTest.java

Changeset: e1382973
Branch: master
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-07-01 14:30:20 +0000
URL:       https://git.openjdk.org/loom/commit/e138297323de3f6990c4c536b1cefd209ce3a69c

8359436: AOTCompileEagerly should not be diagnostic

Reviewed-by: kvn, syan, dholmes

! src/hotspot/share/cds/cds_globals.hpp
+ test/hotspot/jtreg/runtime/cds/appcds/aotCache/AOTCompileEagerly.java

Changeset: e1681c48
Branch: master
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-07-01 15:32:26 +0000
URL:       https://git.openjdk.org/loom/commit/e1681c48287bcce6c8f617d9c0c25354dd62870a

8359477: com/sun/net/httpserver/Test12.java appears to have a temp file race

Reviewed-by: dfuchs, vyazici

! test/jdk/com/sun/net/httpserver/FileServerHandler.java
! test/jdk/com/sun/net/httpserver/Test12.java

Changeset: 38f59f84
Branch: master
Author:    Mohamed Issa <missa at openjdk.org>
Committer: Sandhya Viswanathan <sviswanathan at openjdk.org>
Date:      2025-07-01 15:34:37 +0000
URL:       https://git.openjdk.org/loom/commit/38f59f84c98dfd974eec0c05541b2138b149def7

8358179: Performance regression in Math.cbrt

Reviewed-by: sviswanathan, sparasa, epeter

! src/hotspot/cpu/x86/stubGenerator_x86_64_cbrt.cpp

Changeset: e7a45003
Branch: master
Author:    Coleen Phillimore <coleenp at openjdk.org>
Date:      2025-07-01 17:14:36 +0000
URL:       https://git.openjdk.org/loom/commit/e7a450038a47a76d2e616ebce2a7fa8a51e36ea4

8359707: Add classfile modification code to RedefineClassHelper

Reviewed-by: lmesnik, dholmes, sspitsyn

! test/hotspot/jtreg/serviceability/jvmti/RedefineClasses/ClassVersionAfterRedefine.java
! test/lib/RedefineClassHelper.java

Changeset: 282ee40a
Branch: master
Author:    Leonid Mesnik <lmesnik at openjdk.org>
Date:      2025-07-01 17:22:33 +0000
URL:       https://git.openjdk.org/loom/commit/282ee40a56af46521b94fe6e4c90e78b8f513b29

8359366: RunThese30M.java EXCEPTION_ACCESS_VIOLATION in JvmtiBreakpoints::clearall_in_class_at_safepoint

Reviewed-by: coleenp, dholmes, sspitsyn

! src/hotspot/share/prims/jvmtiImpl.cpp

Changeset: 13a39278
Branch: master
Author:    Kevin Walls <kevinw at openjdk.org>
Date:      2025-07-01 19:07:49 +0000
URL:       https://git.openjdk.org/loom/commit/13a3927855da61fe27f3b43e5e4755d0c5ac5a16

8359870: JVM crashes in AccessInternal::PostRuntimeDispatch

Reviewed-by: amenkov, dholmes, sspitsyn

! src/hotspot/share/prims/jvm.cpp
! src/hotspot/share/services/threadService.cpp
! src/java.base/share/classes/jdk/internal/vm/ThreadDumper.java
! src/java.base/share/classes/jdk/internal/vm/ThreadSnapshot.java
! test/jdk/com/sun/management/HotSpotDiagnosticMXBean/DumpThreadsWithEliminatedLock.java

Changeset: e9a62d79
Branch: master
Author:    Daniel Jeli?ski <djelinski at openjdk.org>
Date:      2025-07-01 19:19:25 +0000
URL:       https://git.openjdk.org/loom/commit/e9a62d79cdc43e5eb141f1d47624d0f6fe05989d

8361125: Fix typo in onTradAbsence

Reviewed-by: hchao, mullan, shade

! src/java.base/share/classes/sun/security/ssl/KeyShareExtension.java
! src/java.base/share/classes/sun/security/ssl/PreSharedKeyExtension.java
! src/java.base/share/classes/sun/security/ssl/SSLExtension.java
! src/java.base/share/classes/sun/security/ssl/SupportedGroupsExtension.java

Changeset: 534d2b33
Branch: master
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-07-01 19:52:06 +0000
URL:       https://git.openjdk.org/loom/commit/534d2b33dc23d0171fdce3cb89d679d5088b4667

8357064: cds/appcds/ArchiveRelocationTest.java failed with missing expected output

Reviewed-by: shade, iklam

! test/hotspot/jtreg/runtime/cds/appcds/ArchiveRelocationTest.java

Changeset: 7d7e60c8
Branch: master
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-01 20:22:13 +0000
URL:       https://git.openjdk.org/loom/commit/7d7e60c8aebc4b4c1e7121be702393e5bc46e9ce

8360164: AOT cache creation crashes in ~ThreadTotalCPUTimeClosure()

Reviewed-by: ccheung, kvn, dholmes

! src/hotspot/share/cds/metaspaceShared.cpp

Changeset: a910b20b
Branch: master
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-02 00:17:19 +0000
URL:       https://git.openjdk.org/loom/commit/a910b20b51157d8f36418bd60b328193ebfb502e

8346914: UB issue in scalbnA

Reviewed-by: aph, tschatzl

! src/hotspot/cpu/aarch64/macroAssembler_aarch64_trig.cpp
! src/hotspot/share/runtime/sharedRuntimeMath.hpp
! src/hotspot/share/runtime/sharedRuntimeTrans.cpp
! src/hotspot/share/runtime/sharedRuntimeTrig.cpp

Changeset: 1703915d
Branch: master
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-02 00:25:26 +0000
URL:       https://git.openjdk.org/loom/commit/1703915d3fe3608ca558671814f78d9dcf5886e6

8361085: MemoryReserver log_on_large_pages_failure has incorrect format usage

Reviewed-by: stefank, dholmes

! src/hotspot/share/memory/memoryReserver.cpp

Changeset: c6448dc3
Branch: master
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-02 00:28:24 +0000
URL:       https://git.openjdk.org/loom/commit/c6448dc3afb1da9d93bb94804aa1971a650b91b7

8361086: JVMCIGlobals::check_jvmci_flags_are_consistent has incorrect format string

Reviewed-by: kvn, mhaessig, yzheng

! src/hotspot/share/jvmci/jvmci_globals.cpp

Changeset: 2bff8e0a
Branch: master
Author:    Prasanta Sadhukhan <psadhukhan at openjdk.org>
Date:      2025-07-02 03:07:07 +0000
URL:       https://git.openjdk.org/loom/commit/2bff8e0a1382f8820bc2479af87e45dc6b74cdb5

8360462: [macosx] row selection not working with Ctrl+Shift+Down/Up in AquaL&F

Reviewed-by: dnguyen, abhiscxk

! src/java.desktop/macosx/classes/com/apple/laf/AquaKeyBindings.java
+ test/jdk/javax/swing/JTree/TestTreeRowSelection.java

Changeset: 055d2ffa
Branch: master
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-02 04:24:55 +0000
URL:       https://git.openjdk.org/loom/commit/055d2ffa69e129b7617369e268f272517f25e2d7

8361215: Add AOT test case: verification constraint classes are excluded

Reviewed-by: ccheung

! test/hotspot/jtreg/TEST.groups
! test/hotspot/jtreg/runtime/cds/appcds/aotCache/ExcludedClasses.java
! test/lib/jdk/test/lib/cds/CDSAppTester.java

Changeset: 1ac74898
Branch: master
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2025-07-02 05:38:28 +0000
URL:       https://git.openjdk.org/loom/commit/1ac74898745ce9b109db5571d9dcbd907dd05831

8361180: Disable CompiledDirectCall verification with -VerifyInlineCaches

Reviewed-by: kvn, thartmann

! src/hotspot/share/code/compiledIC.hpp

Changeset: 0f1cd987
Branch: master
Author:    Anton Artemov <anton.artemov at oracle.com>
Committer: David Holmes <dholmes at openjdk.org>
Date:      2025-07-02 06:49:36 +0000
URL:       https://git.openjdk.org/loom/commit/0f1cd987b3520eaeab31e9faf782d6f81050803a

8284016: Normalize handshake closure names

Reviewed-by: coleenp, sspitsyn

! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/z/zMark.cpp
! src/hotspot/share/prims/scopedMemoryAccess.cpp
! src/hotspot/share/prims/whitebox.cpp
! src/hotspot/share/runtime/deoptimization.cpp
! src/hotspot/share/runtime/escapeBarrier.cpp
! src/hotspot/share/runtime/handshake.cpp
! src/hotspot/share/runtime/handshake.hpp
! src/hotspot/share/runtime/javaThread.cpp
! src/hotspot/share/runtime/javaThread.hpp
! src/hotspot/share/runtime/javaThread.inline.hpp
! src/hotspot/share/runtime/suspendResumeManager.cpp
! src/hotspot/share/runtime/suspendResumeManager.hpp
! src/hotspot/share/runtime/synchronizer.cpp
! src/hotspot/share/runtime/vmThread.cpp
! src/hotspot/share/services/threadService.cpp

Changeset: 2304044a
Branch: master
Author:    Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-02 08:35:51 +0000
URL:       https://git.openjdk.org/loom/commit/2304044ab2f228fe2fe4adb5975291e733b12d5c

8360641: TestCompilerCounts fails after 8354727

Reviewed-by: kvn, dfenacci, mdoerr

! test/hotspot/jtreg/compiler/arguments/TestCompilerCounts.java

Changeset: eac8f5d2
Branch: master
Author:    Saranya Natarajan <snatarajan at openjdk.org>
Committer: Daniel Lund?n <dlunden at openjdk.org>
Date:      2025-07-02 08:38:31 +0000
URL:       https://git.openjdk.org/loom/commit/eac8f5d2c99e1bcc526da0f6a05af76e815c2db9

8325478: Restructure the macro expansion compiler phase to not include macro elimination

Reviewed-by: kvn, dlunden

! src/hotspot/share/opto/c2_globals.hpp
! src/hotspot/share/opto/compile.cpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/opto/macro.hpp
! src/hotspot/share/opto/phasetype.hpp
! src/utils/IdealGraphVisualizer/README.md
! test/hotspot/jtreg/compiler/arguments/TestStressOptions.java
! test/hotspot/jtreg/compiler/debug/TestGenerateStressSeed.java
! test/hotspot/jtreg/compiler/debug/TestStress.java
! test/hotspot/jtreg/compiler/lib/ir_framework/CompilePhase.java
! test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java

Changeset: ce998699
Branch: master
Author:    Taizo Kurashige <tkurashige at openjdk.org>
Committer: Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-02 09:21:57 +0000
URL:       https://git.openjdk.org/loom/commit/ce9986991d60e116ac6680a1b6a4b3ee5384d105

8359120: Improve warning message when fail to load hsdis library

Reviewed-by: mhaessig, thartmann

! src/hotspot/share/code/nmethod.cpp
! src/hotspot/share/compiler/abstractDisassembler.cpp

Changeset: 3066a67e
Branch: master
Author:    Ashutosh Mehra <asmehra at openjdk.org>
Date:      2025-07-02 13:25:00 +0000
URL:       https://git.openjdk.org/loom/commit/3066a67e6279f7e3896ab545bc6c291d279d2b03

8361101: AOTCodeAddressTable::_stubs_addr not initialized/freed properly

Reviewed-by: kvn, shade

! src/hotspot/share/code/aotCodeCache.cpp
! src/hotspot/share/code/aotCodeCache.hpp

Changeset: 832bfbc0
Branch: master
Author:    Albert Mingkun Yang <ayang at openjdk.org>
Date:      2025-07-02 13:39:16 +0000
URL:       https://git.openjdk.org/loom/commit/832bfbc0ddcf3068bab5d45d361803152736383f

8338474: Parallel: Deprecate and obsolete PSChunkLargeArrays

Reviewed-by: tschatzl, kbarrett

! src/hotspot/share/gc/parallel/parallel_globals.hpp
! src/hotspot/share/runtime/arguments.cpp


From jianbin at apache.org  Thu Jul  3 01:14:36 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Thu, 3 Jul 2025 09:14:36 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <25561a41-7234-4cbf-a7f8-3f88a9b84e99@oracle.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
 <25561a41-7234-4cbf-a7f8-3f88a9b84e99@oracle.com>
Message-ID: <CAAMX02ruqcqQbmH+i+=p=1-QJYV8guRYcR3bJifa+BpDHbPOdw@mail.gmail.com>

Sorry to bother you all again. When using virtual threads on JDK 21, I've
always been concerned about potential pinning situations, so during testing
in our offline environment, we always add the -Djdk.tracePinnedThreads=full
parameter. However, we have never seen any pinned-related information
output. Yesterday I conducted a test and found that when using synchronized
+ object.wait(), even though the maximum number of platform threads used by
virtual threads has already reached the limit, it still cannot output
pinned-related logs. But if I switch to synchronized + Thread.sleep(), it
can output the logs. I'm providing my example and JVM parameters below,
hoping someone can help explain this issue. Thank you very much.

JVM parameters: -Djdk.tracePinnedThreads=full
-Djava.util.concurrent.ForkJoinPool.common.parallelism=2
-Djdk.virtualThreadScheduler.parallelism=2
-Djava.util.concurrent.ForkJoinPool.common.maximumSpares=2
-Djdk.virtualThreadScheduler.maxPoolSize=2

```
public static void main(String[] args) throws InterruptedException {
    Executor executor = ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
    List<String> list = new ArrayList<>();
    for (int i = 0; i < 20; i++) {
        list.add(String.valueOf(i));
    }
    for (int i = 0; i < list.size(); i++) {
        String value = list.get(i);
        executor.execute(() -> {
            synchronized (value) {
                try {
                    value.wait();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        });
    }
    Thread.sleep(120000);
}
```

Best Regards.
Jianbin Chen, github-id: funky-eyes

Alan Bateman <alan.bateman at oracle.com> ? 2025?7?2??? 17:19???

>
>
> On 02/07/2025 09:27, Andrew Haley wrote:
> > On 02/07/2025 05:15, Peter Eastham wrote:
> >> As Java 21 is still the current LTS, it isn't completely unreasonable to
> >> forward concerns to the mailing list.
> >
> > Sure, we'e happy to talk about it, but as far as this group is
> > concerned the issue has been resolved.
>
> Right, and as a reminder: the changes were to the lightweight locking
> mode only (not legacy) and that mode only became the default in JDK 22.
> There is also a prerequisite spec change to JVMTI GetObjectMonitorUsage
> that happened in JDK 23. It also seems pointless given that JDK 24 is
> already released and JDK 25 is very close.
>
> -Alan
>
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From jianbin at apache.org  Thu Jul  3 06:47:53 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Thu, 3 Jul 2025 14:47:53 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02ruqcqQbmH+i+=p=1-QJYV8guRYcR3bJifa+BpDHbPOdw@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
 <25561a41-7234-4cbf-a7f8-3f88a9b84e99@oracle.com>
 <CAAMX02ruqcqQbmH+i+=p=1-QJYV8guRYcR3bJifa+BpDHbPOdw@mail.gmail.com>
Message-ID: <CAAMX02rFZM--wMXOQxW2Tu1Rm0=UTn+43HPvVeQwj0rboUy7nQ@mail.gmail.com>

Hello everyone

Has anyone taken a look at my example? I'm really curious to know why JDK
21 cannot detect pinned platform thread behavior in this particular
example. If someone could help explain this, I would be extremely grateful!

Best Regards.
Jianbin Chen, github-id: funky-eyes

Jianbin Chen <jianbin at apache.org> ? 2025?7?3??? 09:14???

> Sorry to bother you all again. When using virtual threads on JDK 21, I've
> always been concerned about potential pinning situations, so during testing
> in our offline environment, we always add the -Djdk.tracePinnedThreads=full
> parameter. However, we have never seen any pinned-related information
> output. Yesterday I conducted a test and found that when using synchronized
> + object.wait(), even though the maximum number of platform threads used by
> virtual threads has already reached the limit, it still cannot output
> pinned-related logs. But if I switch to synchronized + Thread.sleep(), it
> can output the logs. I'm providing my example and JVM parameters below,
> hoping someone can help explain this issue. Thank you very much.
>
> JVM parameters: -Djdk.tracePinnedThreads=full
> -Djava.util.concurrent.ForkJoinPool.common.parallelism=2
> -Djdk.virtualThreadScheduler.parallelism=2
> -Djava.util.concurrent.ForkJoinPool.common.maximumSpares=2
> -Djdk.virtualThreadScheduler.maxPoolSize=2
>
> ```
> public static void main(String[] args) throws InterruptedException {
>     Executor executor =
> ThreadPoolFactory.newVirtualThreadPerTaskExecutor();
>     List<String> list = new ArrayList<>();
>     for (int i = 0; i < 20; i++) {
>         list.add(String.valueOf(i));
>     }
>     for (int i = 0; i < list.size(); i++) {
>         String value = list.get(i);
>         executor.execute(() -> {
>             synchronized (value) {
>                 try {
>                     value.wait();
>                 } catch (InterruptedException e) {
>                     throw new RuntimeException(e);
>                 }
>             }
>         });
>     }
>     Thread.sleep(120000);
> }
> ```
>
> Best Regards.
> Jianbin Chen, github-id: funky-eyes
>
> Alan Bateman <alan.bateman at oracle.com> ? 2025?7?2??? 17:19???
>
>>
>>
>> On 02/07/2025 09:27, Andrew Haley wrote:
>> > On 02/07/2025 05:15, Peter Eastham wrote:
>> >> As Java 21 is still the current LTS, it isn't completely unreasonable
>> to
>> >> forward concerns to the mailing list.
>> >
>> > Sure, we'e happy to talk about it, but as far as this group is
>> > concerned the issue has been resolved.
>>
>> Right, and as a reminder: the changes were to the lightweight locking
>> mode only (not legacy) and that mode only became the default in JDK 22.
>> There is also a prerequisite spec change to JVMTI GetObjectMonitorUsage
>> that happened in JDK 23. It also seems pointless given that JDK 24 is
>> already released and JDK 25 is very close.
>>
>> -Alan
>>
>
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From alan.bateman at oracle.com  Thu Jul  3 06:50:53 2025
From: alan.bateman at oracle.com (Alan Bateman)
Date: Thu, 3 Jul 2025 07:50:53 +0100
Subject: Virtual threads created more platform threads
In-Reply-To: <CAAMX02ruqcqQbmH+i+=p=1-QJYV8guRYcR3bJifa+BpDHbPOdw@mail.gmail.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
 <25561a41-7234-4cbf-a7f8-3f88a9b84e99@oracle.com>
 <CAAMX02ruqcqQbmH+i+=p=1-QJYV8guRYcR3bJifa+BpDHbPOdw@mail.gmail.com>
Message-ID: <f7430dfa-bac5-4afe-9f11-129ad2746985@oracle.com>


On 03/07/2025 02:14, Jianbin Chen wrote:
> Sorry to bother you all again. When using virtual threads on JDK 21, 
> I've always been concerned about potential pinning situations, so 
> during testing in our offline environment, we always add the 
> -Djdk.tracePinnedThreads=full parameter. However, we have never seen 
> any pinned-related information output. Yesterday I conducted a test 
> and found that when using synchronized + object.wait(), even though 
> the maximum number of platform threads used by virtual threads has 
> already reached the limit, it still cannot output pinned-related logs. 
> But if I switch to synchronized + Thread.sleep(), it can output the 
> logs. I'm providing my example and JVM parameters below, hoping 
> someone can help explain this issue. Thank you very much.

That rudimentary tracing/debug option printed a stack trace when a 
virtual thread parked inside a synchronized method. It didn't help with 
Object.wait or other cases.

Once you get to JDK 24+ you can drop -Djdk.tracePinnedThreads=full as 
this system property has no effect. The changes to object monitors in 
JDK 24, and the improvements to JFR events for pinning in the same 
release, means the tracing option isn't needed.

-Alan


From jianbin at apache.org  Thu Jul  3 06:55:50 2025
From: jianbin at apache.org (Jianbin Chen)
Date: Thu, 3 Jul 2025 14:55:50 +0800
Subject: Virtual threads created more platform threads
In-Reply-To: <f7430dfa-bac5-4afe-9f11-129ad2746985@oracle.com>
References: <CAAMX02oVCSxnkJ0NqdZni1mk6jz7-vVKZ6B32+6SJmS8XSNY6A@mail.gmail.com>
 <CABe8uE3tQibWy1myDrSc5drZHW5WbdubnjL7__UPwsSHo4GmdA@mail.gmail.com>
 <CAN+txM99Vkn6iOxXrnpYPmsZkJ_Aosik4EfHXgNAENenVYSE+A@mail.gmail.com>
 <42b80f14-8167-4de6-b372-765f59a50d8c@littlepinkcloud.com>
 <25561a41-7234-4cbf-a7f8-3f88a9b84e99@oracle.com>
 <CAAMX02ruqcqQbmH+i+=p=1-QJYV8guRYcR3bJifa+BpDHbPOdw@mail.gmail.com>
 <f7430dfa-bac5-4afe-9f11-129ad2746985@oracle.com>
Message-ID: <CAAMX02qx-wcOExqefSFGcjtN619=C10vfD3aOpOMnn76npRhug@mail.gmail.com>

OK I understand now, thank you again for your help.

Best Regards.
Jianbin Chen, github-id: funky-eyes

Alan Bateman <alan.bateman at oracle.com> ? 2025?7?3??? 14:52???

>
> On 03/07/2025 02:14, Jianbin Chen wrote:
> > Sorry to bother you all again. When using virtual threads on JDK 21,
> > I've always been concerned about potential pinning situations, so
> > during testing in our offline environment, we always add the
> > -Djdk.tracePinnedThreads=full parameter. However, we have never seen
> > any pinned-related information output. Yesterday I conducted a test
> > and found that when using synchronized + object.wait(), even though
> > the maximum number of platform threads used by virtual threads has
> > already reached the limit, it still cannot output pinned-related logs.
> > But if I switch to synchronized + Thread.sleep(), it can output the
> > logs. I'm providing my example and JVM parameters below, hoping
> > someone can help explain this issue. Thank you very much.
>
> That rudimentary tracing/debug option printed a stack trace when a
> virtual thread parked inside a synchronized method. It didn't help with
> Object.wait or other cases.
>
> Once you get to JDK 24+ you can drop -Djdk.tracePinnedThreads=full as
> this system property has no effect. The changes to object monitors in
> JDK 24, and the improvements to JFR events for pinning in the same
> release, means the tracing option isn't needed.
>
> -Alan
>
>
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From duke at openjdk.org  Mon Jul  7 05:58:23 2025
From: duke at openjdk.org (duke)
Date: Mon, 7 Jul 2025 05:58:23 GMT
Subject: git: openjdk/loom: fibers: 42 new changesets
Message-ID: <e6a4e3da-c222-4df1-9040-975b980a4946@openjdk.org>

Changeset: 549b8758
Branch: fibers
Author:    Joe Darcy <darcy at openjdk.org>
Date:      2025-07-02 15:24:29 +0000
URL:       https://git.openjdk.org/loom/commit/549b8758661e760a7475fb398fd5b036e561fed6

8361112: Use exact float -> Float16 conversion method in Float16 tests

Reviewed-by: liach, rgiulietti

! test/jdk/jdk/incubator/vector/BasicFloat16ArithTests.java

Changeset: c460f842
Branch: fibers
Author:    Martin Doerr <mdoerr at openjdk.org>
Date:      2025-07-02 15:31:29 +0000
URL:       https://git.openjdk.org/loom/commit/c460f842bf768995b271cd6362940877a4a79665

8361183: JDK-8360887 needs fixes to avoid cycles and better tests (aix)

Co-authored-by: Alan Bateman <alanb at openjdk.org>
Reviewed-by: alanb, jkern

! src/java.base/aix/classes/sun/nio/fs/AixFileSystemProvider.java
! test/jdk/java/nio/file/FileStore/Basic.java

Changeset: c5037059
Branch: fibers
Author:    Hamlin Li <mli at openjdk.org>
Date:      2025-07-02 17:16:12 +0000
URL:       https://git.openjdk.org/loom/commit/c50370599e40bfaeccba9aa6b28da661129f9450

8360090: [TEST] RISC-V: disable some cds tests on qemu

Reviewed-by: lmesnik, rehn

! test/hotspot/jtreg/TEST.ROOT
! test/hotspot/jtreg/runtime/cds/TestDefaultArchiveLoading.java
! test/hotspot/jtreg/runtime/cds/appcds/TestDumpClassListSource.java
! test/hotspot/jtreg/runtime/cds/appcds/TransformInterfaceOfLambda.java
! test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/TestAutoCreateSharedArchiveNoDefaultArchive.java
! test/jtreg-ext/requires/VMProps.java

Changeset: 5e30bf68
Branch: fibers
Author:    Jatin Bhateja <jbhateja at openjdk.org>
Date:      2025-07-02 17:47:20 +0000
URL:       https://git.openjdk.org/loom/commit/5e30bf68353d989aadc2d8176181226b2debd283

8360116: Add support for AVX10 floating point minmax instruction

Reviewed-by: mhaessig, sviswanathan

! src/hotspot/cpu/x86/assembler_x86.cpp
! src/hotspot/cpu/x86/assembler_x86.hpp
! src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp
! src/hotspot/cpu/x86/c2_MacroAssembler_x86.hpp
! src/hotspot/cpu/x86/macroAssembler_x86.cpp
! src/hotspot/cpu/x86/x86.ad
! src/hotspot/cpu/x86/x86_64.ad

Changeset: ea86a20e
Branch: fibers
Author:    Yudi Zheng <yzheng at openjdk.org>
Date:      2025-07-02 18:38:31 +0000
URL:       https://git.openjdk.org/loom/commit/ea86a20e6d74baea54df32415d9096d3b7bba1d7

8357424: [JVMCI] Avoid incrementing decompilation count for hosted compiled nmethod

Reviewed-by: dnsimon, never, cslucas

! src/hotspot/share/code/nmethod.cpp
! src/hotspot/share/code/nmethod.hpp
! src/hotspot/share/jvmci/jvmciRuntime.cpp
! src/hotspot/share/jvmci/jvmciRuntime.hpp
! src/hotspot/share/runtime/deoptimization.cpp

Changeset: 74822ce1
Branch: fibers
Author:    Boris Ulasevich <bulasevich at openjdk.org>
Date:      2025-07-02 21:15:46 +0000
URL:       https://git.openjdk.org/loom/commit/74822ce12acaf9816aa49b75ab5817ced3710776

8358183: [JVMCI] crash accessing nmethod::jvmci_name in CodeCache::aggregate

Reviewed-by: eastigeevich, phh

! src/hotspot/share/code/codeBlob.cpp
! src/hotspot/share/code/nmethod.cpp

Changeset: 1926aeb1
Branch: fibers
Author:    Takuya Kiriyama <tkiriyama at openjdk.org>
Date:      2025-07-03 06:47:11 +0000
URL:       https://git.openjdk.org/loom/commit/1926aeb1a3b39cf2e4ea48f4c489cd023b5aa77d

8352016: Improve java/lang/RuntimeTests/RuntimeExitLogTest.java

Reviewed-by: rriggs

+ test/jdk/java/lang/RuntimeTests/ExitLogging-ALL.properties
! test/jdk/java/lang/RuntimeTests/ExitLogging-FINE.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-FINER.properties
! test/jdk/java/lang/RuntimeTests/ExitLogging-INFO.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-OFF.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-SEVERE.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-WARNING.properties
! test/jdk/java/lang/RuntimeTests/RuntimeExitLogTest.java

Changeset: 6c9236c8
Branch: fibers
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-03 06:59:00 +0000
URL:       https://git.openjdk.org/loom/commit/6c9236c80c236487a7c37dcb947c0f9192322208

8361238: G1 tries to get CPU info from terminated threads at shutdown

Reviewed-by: kbarrett, sangheki

! src/hotspot/share/runtime/java.cpp

Changeset: fd13e1ce
Branch: fibers
Author:    Jan Lahoda <jlahoda at openjdk.org>
Date:      2025-07-03 07:17:59 +0000
URL:       https://git.openjdk.org/loom/commit/fd13e1ce9805a903ab60ad9b476eb5a6687d22ee

8358801: javac produces class that does not pass verifier.

Reviewed-by: mcimadamore, liach

! src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java
+ test/langtools/tools/javac/patterns/T8358801.java

Changeset: c75df634
Branch: fibers
Author:    Beno?t Maillard <bmaillard at openjdk.org>
Committer: Emanuel Peter <epeter at openjdk.org>
Date:      2025-07-03 07:28:11 +0000
URL:       https://git.openjdk.org/loom/commit/c75df634be9a0073fa246d42e5c362a09f1734f3

8359602: Ideal optimizations depending on input type are missed because of missing notification mechanism from CCP

Reviewed-by: epeter, thartmann

! src/hotspot/share/opto/phaseX.cpp
+ test/hotspot/jtreg/compiler/c2/TestModControlFoldedAfterCCP.java

Changeset: 2f683fdc
Branch: fibers
Author:    Jatin Bhateja <jbhateja at openjdk.org>
Date:      2025-07-03 08:03:55 +0000
URL:       https://git.openjdk.org/loom/commit/2f683fdc4a8f9c227e878b0d7fca645fc8abe1b6

8361037: [ubsan] compiler/c2/irTests/TestFloat16ScalarOperations division by 0

Reviewed-by: mhaessig, sviswanathan

! src/hotspot/share/opto/divnode.cpp

Changeset: 1be29bd7
Branch: fibers
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-07-03 09:32:09 +0000
URL:       https://git.openjdk.org/loom/commit/1be29bd725a4642b841c60c19f2f7f689a360831

8361060: Keep track of the origin server against which a jdk.internal.net.http.HttpConnection was constructed

Reviewed-by: dfuchs

! src/java.net.http/share/classes/jdk/internal/net/http/AbstractAsyncSSLConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/AsyncSSLConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/AsyncSSLTunnelConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/HttpConnection.java
+ src/java.net.http/share/classes/jdk/internal/net/http/Origin.java
! src/java.net.http/share/classes/jdk/internal/net/http/PlainHttpConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/PlainProxyConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/PlainTunnelingConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/common/Utils.java
+ test/jdk/java/net/httpclient/OriginTest.java
! test/jdk/java/net/httpclient/whitebox/java.net.http/jdk/internal/net/http/ConnectionPoolTest.java

Changeset: 2528c620
Branch: fibers
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-07-03 11:35:54 +0000
URL:       https://git.openjdk.org/loom/commit/2528c620a61195ac22d921b168444a7967bf1805

8361198: [AIX] fix misleading error output in thread_cpu_time_unchecked

Reviewed-by: mdoerr, azeller

! src/hotspot/os/aix/os_aix.cpp

Changeset: 5e40fb6b
Branch: fibers
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-03 11:43:35 +0000
URL:       https://git.openjdk.org/loom/commit/5e40fb6bda1d56e3eba584b49aa0b68096b34169

8277394: Remove the use of safepoint_workers in reference processor

Co-authored-by: Albert Mingkun Yang <ayang at openjdk.org>
Reviewed-by: ayang, iwalulya

! src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
! src/hotspot/share/gc/g1/g1FullCollector.cpp
! src/hotspot/share/gc/g1/g1YoungCollector.cpp
! src/hotspot/share/gc/parallel/psParallelCompact.cpp
! src/hotspot/share/gc/parallel/psScavenge.cpp
! src/hotspot/share/gc/serial/defNewGeneration.cpp
! src/hotspot/share/gc/serial/serialFullGC.cpp
! src/hotspot/share/gc/shared/referenceProcessor.cpp
! src/hotspot/share/gc/shared/referenceProcessor.hpp

Changeset: 24117c6e
Branch: fibers
Author:    Rajat Mahajan <rmahajan at openjdk.org>
Committer: Alexey Ivanov <aivanov at openjdk.org>
Date:      2025-07-03 14:24:52 +0000
URL:       https://git.openjdk.org/loom/commit/24117c6e9aa862bad839e93eff70810a75605ac5

8349188: LineBorder does not scale correctly

Co-authored-by: Alexey Ivanov <aivanov at openjdk.org>
Reviewed-by: aivanov, serb

! src/java.desktop/share/classes/javax/swing/border/LineBorder.java
! test/jdk/javax/swing/border/LineBorder/ScaledLineBorderTest.java
! test/jdk/javax/swing/border/LineBorder/ScaledTextFieldBorderTest.java

Changeset: 3daa03c3
Branch: fibers
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-03 15:31:34 +0000
URL:       https://git.openjdk.org/loom/commit/3daa03c30f8e6ab9c498edb7d59346ce0b30450f

8358680: AOT cache creation fails: no strings should have been added

Co-authored-by: Aleksey Shipilev <shade at openjdk.org>
Reviewed-by: coleenp, shade

! src/hotspot/share/classfile/stringTable.cpp
! src/hotspot/share/classfile/stringTable.hpp
! src/hotspot/share/compiler/compileBroker.cpp
! src/hotspot/share/compiler/compileBroker.hpp
! src/hotspot/share/compiler/compileTask.cpp
! src/hotspot/share/compiler/compileTask.hpp
! src/hotspot/share/runtime/mutexLocker.cpp
! src/hotspot/share/runtime/mutexLocker.hpp

Changeset: 66836d40
Branch: fibers
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-03 16:52:19 +0000
URL:       https://git.openjdk.org/loom/commit/66836d40b80f9c5482c1322d1d07f078ad9dcc02

8361292: Rename ModuleEntry::module() to module_oop()

Reviewed-by: coleenp, ccheung, sspitsyn

! src/hotspot/share/classfile/classFileParser.cpp
! src/hotspot/share/classfile/classLoaderDataShared.cpp
! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/classfile/moduleEntry.cpp
! src/hotspot/share/classfile/moduleEntry.hpp
! src/hotspot/share/classfile/modules.cpp
! src/hotspot/share/jfr/jni/jfrUpcalls.cpp
! src/hotspot/share/jvmci/jvmciCompiler.cpp
! src/hotspot/share/oops/arrayKlass.cpp
! src/hotspot/share/oops/klass.cpp
! src/hotspot/share/prims/jvmtiExport.cpp
! src/hotspot/share/runtime/reflection.cpp

Changeset: a2315ddd
Branch: fibers
Author:    Evgeny Nikitin <enikitin at openjdk.org>
Committer: Leonid Mesnik <lmesnik at openjdk.org>
Date:      2025-07-03 16:58:30 +0000
URL:       https://git.openjdk.org/loom/commit/a2315ddd2a343ed594dd1b0b3d0dc5b3a71f509b

8357739: [jittester] disable the hashCode method

Reviewed-by: lmesnik

! test/hotspot/jtreg/testlibrary/jittester/conf/exclude.methods.lst
+ test/hotspot/jtreg/testlibrary/jittester/src/jdk/test/lib/jittester/MethodTemplate.java
! test/hotspot/jtreg/testlibrary/jittester/src/jdk/test/lib/jittester/TypesParser.java
+ test/lib-test/jdk/test/lib/jittester/MethodTemplateTest.java

Changeset: 25ed36f3
Branch: fibers
Author:    Archie Cobbs <acobbs at openjdk.org>
Date:      2025-07-03 18:13:07 +0000
URL:       https://git.openjdk.org/loom/commit/25ed36f3ef1fe1d6914689c762910f104775f48c

8359493: Refactor how aggregated mandatory warnings are handled in the compiler
8350514: Refactor MandatoryWarningHandler to support dynamic verbosity

Reviewed-by: mcimadamore

! make/langtools/tools/propertiesparser/gen/ClassGenerator.java
! make/langtools/tools/propertiesparser/parser/Message.java
! make/langtools/tools/propertiesparser/parser/MessageLine.java
! make/langtools/tools/propertiesparser/resources/templates.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTaskPool.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Preview.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/MemoryContext.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/main/JavaCompiler.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/JCDiagnostic.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/Log.java
- src/jdk.compiler/share/classes/com/sun/tools/javac/util/MandatoryWarningHandler.java
+ src/jdk.compiler/share/classes/com/sun/tools/javac/util/WarningAggregator.java

Changeset: 2d9f0324
Branch: fibers
Author:    Brian Burkhalter <bpb at openjdk.org>
Date:      2025-07-03 18:53:59 +0000
URL:       https://git.openjdk.org/loom/commit/2d9f0324ba21adf216649339c48e49b9cd1e33ff

8360028: (fs) Path.relativize throws StringIndexOutOfBoundsException (win)

Reviewed-by: alanb

! src/java.base/windows/classes/sun/nio/fs/WindowsLinkSupport.java

Changeset: 003be0de
Branch: fibers
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-07-03 19:40:22 +0000
URL:       https://git.openjdk.org/loom/commit/003be0dee2f6c190697ec0a923546362c50cc0e5

8361325: Refactor ClassLoaderExt

Reviewed-by: coleenp, sspitsyn

! src/hotspot/share/cds/archiveBuilder.cpp
! src/hotspot/share/cds/cdsProtectionDomain.cpp
! src/hotspot/share/cds/classListParser.cpp
! src/hotspot/share/cds/filemap.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/cds/metaspaceShared.cpp
! src/hotspot/share/classfile/classLoader.cpp
! src/hotspot/share/classfile/classLoader.hpp
- src/hotspot/share/classfile/classLoaderExt.cpp
- src/hotspot/share/classfile/classLoaderExt.hpp
! src/hotspot/share/classfile/modules.cpp
! src/hotspot/share/classfile/systemDictionary.cpp
! src/hotspot/share/classfile/systemDictionaryShared.cpp
! src/hotspot/share/prims/jvmtiEnv.cpp

Changeset: dcc7254a
Branch: fibers
Author:    Eric Caspole <ecaspole at openjdk.org>
Date:      2025-07-03 19:43:30 +0000
URL:       https://git.openjdk.org/loom/commit/dcc7254a38bb0fecacd7683682d4c42e49335222

8361213: J2DAnalyzer should emit the score as a decimal

Reviewed-by: prr

! src/demo/share/java2d/J2DBench/src/j2dbench/report/J2DAnalyzer.java

Changeset: 77e69e02
Branch: fibers
Author:    Erik Gahlin <egahlin at openjdk.org>
Date:      2025-07-03 20:01:33 +0000
URL:       https://git.openjdk.org/loom/commit/77e69e02ebd280636859dd698423db6ac3bc7f5c

8358750: JFR: EventInstrumentation MASK_THROTTLE* constants should be computed in longs

Reviewed-by: mgronlun

! src/jdk.jfr/share/classes/jdk/jfr/internal/EventInstrumentation.java
! test/jdk/jdk/jfr/api/metadata/annotations/TestThrottle.java

Changeset: 566279af
Branch: fibers
Author:    Chen Liang <liach at openjdk.org>
Date:      2025-07-03 20:49:05 +0000
URL:       https://git.openjdk.org/loom/commit/566279af49a7cf47e6030222e989417855caf1a9

8360022: ClassRefDupInConstantPoolTest.java fails when running in repeat

Reviewed-by: vromero

! test/langtools/tools/javac/jvm/ClassRefDupInConstantPoolTest.java

Changeset: da0a51ce
Branch: fibers
Author:    David Holmes <dholmes at openjdk.org>
Date:      2025-07-03 21:02:28 +0000
URL:       https://git.openjdk.org/loom/commit/da0a51ce97453a47b2c7d11e5206774232309e69

8357601: Checked version of JNI Release<type>ArrayElements needs to filter out known wrapped arrays

Reviewed-by: coleenp, jsjolen

! src/hotspot/os/windows/safefetch_windows.hpp
! src/hotspot/share/memory/guardedMemory.cpp
! src/hotspot/share/memory/guardedMemory.hpp
! src/hotspot/share/prims/jniCheck.cpp
+ test/hotspot/jtreg/runtime/jni/checked/TestCharArrayReleasing.java
+ test/hotspot/jtreg/runtime/jni/checked/libCharArrayReleasing.c

Changeset: 16af4733
Branch: fibers
Author:    Manukumar V S <mvs at openjdk.org>
Committer: Phil Race <prr at openjdk.org>
Date:      2025-07-03 22:32:23 +0000
URL:       https://git.openjdk.org/loom/commit/16af473397a7b3a6e6e33dd684d0d511168b989b

8361115: javax/swing/JComboBox/bug4276920.java unnecessarily throws Error instead of RuntimeException

Reviewed-by: prr

! test/jdk/javax/swing/JComboBox/bug4276920.java

Changeset: 854de8c9
Branch: fibers
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-03 23:54:05 +0000
URL:       https://git.openjdk.org/loom/commit/854de8c9c6a1d851c1788e5f2250fe0928c51ca4

8336147: Clarify CDS documentation about static vs dynamic archive

Reviewed-by: ccheung, shade

! src/java.base/share/man/java.md

Changeset: 21f2e9a7
Branch: fibers
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-04 04:08:42 +0000
URL:       https://git.openjdk.org/loom/commit/21f2e9a71c31320a8b1248e3970a82b871c63c2b

8344332: (bf) Migrate DirectByteBuffer away from jdk.internal.ref.Cleaner

Reviewed-by: rriggs, bchristi

! src/java.base/share/classes/java/nio/Bits.java
+ src/java.base/share/classes/java/nio/BufferCleaner.java
! src/java.base/share/classes/java/nio/Direct-X-Buffer.java.template
! src/java.base/share/classes/jdk/internal/misc/Unsafe.java
+ src/java.base/share/classes/sun/nio/Cleaner.java
! src/java.base/share/classes/sun/nio/ch/DirectBuffer.java
! src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
+ test/micro/org/openjdk/bench/java/nio/DirectByteBufferChurn.java
+ test/micro/org/openjdk/bench/java/nio/DirectByteBufferGC.java

Changeset: 5cf349c3
Branch: fibers
Author:    Doug Simon <dnsimon at openjdk.org>
Date:      2025-07-04 07:37:20 +0000
URL:       https://git.openjdk.org/loom/commit/5cf349c3b08324e994a4143dcc34a59fd81323f9

8361355: Negative cases of Annotated.getAnnotationData implementations are broken

Reviewed-by: never

! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaFieldImpl.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaMethodImpl.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaType.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedObjectTypeImpl.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedPrimitiveType.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/meta/ResolvedJavaType.java
! test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/TestResolvedJavaType.java

Changeset: 56ebb8c1
Branch: fibers
Author:    Jonas Norlinder <jonas.norlinder at oracle.com>
Committer: Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-04 10:16:55 +0000
URL:       https://git.openjdk.org/loom/commit/56ebb8c1b936e5a4c14486153c9f60df705095ad

8359110: Log accumulated GC and process CPU time upon VM exit

Co-authored-by: Erik ?sterlund <eosterlund at openjdk.org>
Co-authored-by: Jonas Norlinder <jnorlinder at openjdk.org>
Reviewed-by: tschatzl, ayang

! src/hotspot/os/posix/os_posix.cpp
! src/hotspot/os/windows/os_windows.cpp
! src/hotspot/share/gc/epsilon/epsilonHeap.hpp
! src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp
! src/hotspot/share/gc/serial/serialHeap.hpp
! src/hotspot/share/gc/shared/collectedHeap.cpp
! src/hotspot/share/gc/shared/collectedHeap.hpp
! src/hotspot/share/gc/shared/collectedHeap.inline.hpp
! src/hotspot/share/gc/shared/stringdedup/stringDedup.hpp
! src/hotspot/share/gc/shared/stringdedup/stringDedupProcessor.hpp
+ src/hotspot/share/gc/shared/vmThreadCpuTimeScope.hpp
+ src/hotspot/share/gc/shared/vmThreadCpuTimeScope.inline.hpp
! src/hotspot/share/runtime/java.cpp
! src/hotspot/share/runtime/os.hpp
! src/hotspot/share/runtime/vmThread.cpp

Changeset: fba74f79
Branch: fibers
Author:    Magnus Ihse Bursie <ihse at openjdk.org>
Date:      2025-07-04 12:19:24 +0000
URL:       https://git.openjdk.org/loom/commit/fba74f796eeeb42accc60ecab444c3d933b73e70

8361306: jdk.compiler-gendata needs to depend on java.base-launchers

Reviewed-by: shade

! make/Main.gmk

Changeset: f153e415
Branch: fibers
Author:    Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-04 13:06:36 +0000
URL:       https://git.openjdk.org/loom/commit/f153e415d740f4ede272929171e9bb3e73ddbe1c

8361253: CommandLineOptionTest library should report observed values on failure

Reviewed-by: dholmes, shade

! test/lib/jdk/test/lib/cli/CommandLineOptionTest.java

Changeset: 1c560727
Branch: fibers
Author:    Srinivas Vamsi Parasa <sparasa at openjdk.org>
Committer: Sandhya Viswanathan <sviswanathan at openjdk.org>
Date:      2025-07-04 15:08:57 +0000
URL:       https://git.openjdk.org/loom/commit/1c560727b850593561982ccc3ed37b0e98b3bbee

8360775: Fix Shenandoah GC test failures when APX is enabled

Reviewed-by: sviswanathan, jbhateja, epeter

! src/hotspot/cpu/x86/assembler_x86.cpp
! src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp

Changeset: f2d2eef9
Branch: fibers
Author:    Nizar Benalla <nbenalla at openjdk.org>
Date:      2025-07-04 15:10:22 +0000
URL:       https://git.openjdk.org/loom/commit/f2d2eef988c57cc9f6194a8fd5b2b422035ee68f

8177100: APIs duplicated in JavaDoc

Reviewed-by: liach, hannesw

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/VisibleMemberTable.java
+ test/langtools/jdk/javadoc/doclet/testDuplicateMethodsWarn/TestDuplicateMethods.java

Changeset: f3e0588d
Branch: fibers
Author:    Erik Gahlin <egahlin at openjdk.org>
Date:      2025-07-06 15:21:35 +0000
URL:       https://git.openjdk.org/loom/commit/f3e0588d0b825a68a4ad61ddf806877f46da69dc

8361338: JFR: Min and max time in MethodTime event is confusing

Reviewed-by: mgronlun

! src/jdk.jfr/share/classes/jdk/jfr/events/MethodTimingEvent.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/query/view.ini
! src/jdk.jfr/share/classes/jdk/jfr/internal/tracing/TimedClass.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/tracing/TimedMethod.java

Changeset: 96bb2534
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-06 17:13:51 +0000
URL:       https://git.openjdk.org/loom/commit/96bb253495c959b846b0e82dab2620b376244f22

Merge branch 'master' into fibers

! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/oops/klass.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/oops/klass.cpp

Changeset: 30501ce9
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-03 09:32:18 +0000
URL:       https://git.openjdk.org/loom/commit/30501ce91fa15d16c902eca54d5742b6ae92518a

Allow experimenting with wrapping default scheduler

! src/java.base/share/classes/java/lang/VirtualThread.java

Changeset: 627128de
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-04 16:37:12 +0000
URL:       https://git.openjdk.org/loom/commit/627128de845a7e1090950e006fd05008a63410ef

Document 1-arg constructor

! loom-docs/CustomSchedulers.md

Changeset: 4dc51fd0
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-05 08:04:47 +0000
URL:       https://git.openjdk.org/loom/commit/4dc51fd05af1b242d6a7c1ba5568e9b670a33186

Avoid creating built-in default scheduler when not needed

! src/java.base/share/classes/java/lang/VirtualThread.java

Changeset: 665d1337
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-06 08:51:54 +0000
URL:       https://git.openjdk.org/loom/commit/665d1337ba5c2e70203078164f679cd2a4c43da2

ProblemList-Virtual cleanups

! test/hotspot/jtreg/ProblemList-Virtual.txt
! test/hotspot/jtreg/ProblemList-vthread-Xcomp.txt
! test/jaxp/ProblemList-Virtual.txt
! test/langtools/ProblemList-Virtual.txt
! test/langtools/ProblemList-vthread-Xcomp.txt

Changeset: b79a34f7
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-06 17:15:40 +0000
URL:       https://git.openjdk.org/loom/commit/b79a34f754872ba266001ab60f56245c0f20ae92

Merge loom into fibers


Changeset: 6a7c279b
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-07-07 06:52:49 +0000
URL:       https://git.openjdk.org/loom/commit/6a7c279bdb2e1d01dd31b04fa937afe52bff23fe

tools/javac/lambda/T8031967.java failing

! test/langtools/ProblemList.txt


From duke at openjdk.org  Mon Jul  7 06:00:23 2025
From: duke at openjdk.org (duke)
Date: Mon, 7 Jul 2025 06:00:23 GMT
Subject: git: openjdk/loom: master: 35 new changesets
Message-ID: <cfd3947a-92eb-48b3-8711-ea5a7cb13e7d@openjdk.org>

Changeset: 549b8758
Branch: master
Author:    Joe Darcy <darcy at openjdk.org>
Date:      2025-07-02 15:24:29 +0000
URL:       https://git.openjdk.org/loom/commit/549b8758661e760a7475fb398fd5b036e561fed6

8361112: Use exact float -> Float16 conversion method in Float16 tests

Reviewed-by: liach, rgiulietti

! test/jdk/jdk/incubator/vector/BasicFloat16ArithTests.java

Changeset: c460f842
Branch: master
Author:    Martin Doerr <mdoerr at openjdk.org>
Date:      2025-07-02 15:31:29 +0000
URL:       https://git.openjdk.org/loom/commit/c460f842bf768995b271cd6362940877a4a79665

8361183: JDK-8360887 needs fixes to avoid cycles and better tests (aix)

Co-authored-by: Alan Bateman <alanb at openjdk.org>
Reviewed-by: alanb, jkern

! src/java.base/aix/classes/sun/nio/fs/AixFileSystemProvider.java
! test/jdk/java/nio/file/FileStore/Basic.java

Changeset: c5037059
Branch: master
Author:    Hamlin Li <mli at openjdk.org>
Date:      2025-07-02 17:16:12 +0000
URL:       https://git.openjdk.org/loom/commit/c50370599e40bfaeccba9aa6b28da661129f9450

8360090: [TEST] RISC-V: disable some cds tests on qemu

Reviewed-by: lmesnik, rehn

! test/hotspot/jtreg/TEST.ROOT
! test/hotspot/jtreg/runtime/cds/TestDefaultArchiveLoading.java
! test/hotspot/jtreg/runtime/cds/appcds/TestDumpClassListSource.java
! test/hotspot/jtreg/runtime/cds/appcds/TransformInterfaceOfLambda.java
! test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/TestAutoCreateSharedArchiveNoDefaultArchive.java
! test/jtreg-ext/requires/VMProps.java

Changeset: 5e30bf68
Branch: master
Author:    Jatin Bhateja <jbhateja at openjdk.org>
Date:      2025-07-02 17:47:20 +0000
URL:       https://git.openjdk.org/loom/commit/5e30bf68353d989aadc2d8176181226b2debd283

8360116: Add support for AVX10 floating point minmax instruction

Reviewed-by: mhaessig, sviswanathan

! src/hotspot/cpu/x86/assembler_x86.cpp
! src/hotspot/cpu/x86/assembler_x86.hpp
! src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp
! src/hotspot/cpu/x86/c2_MacroAssembler_x86.hpp
! src/hotspot/cpu/x86/macroAssembler_x86.cpp
! src/hotspot/cpu/x86/x86.ad
! src/hotspot/cpu/x86/x86_64.ad

Changeset: ea86a20e
Branch: master
Author:    Yudi Zheng <yzheng at openjdk.org>
Date:      2025-07-02 18:38:31 +0000
URL:       https://git.openjdk.org/loom/commit/ea86a20e6d74baea54df32415d9096d3b7bba1d7

8357424: [JVMCI] Avoid incrementing decompilation count for hosted compiled nmethod

Reviewed-by: dnsimon, never, cslucas

! src/hotspot/share/code/nmethod.cpp
! src/hotspot/share/code/nmethod.hpp
! src/hotspot/share/jvmci/jvmciRuntime.cpp
! src/hotspot/share/jvmci/jvmciRuntime.hpp
! src/hotspot/share/runtime/deoptimization.cpp

Changeset: 74822ce1
Branch: master
Author:    Boris Ulasevich <bulasevich at openjdk.org>
Date:      2025-07-02 21:15:46 +0000
URL:       https://git.openjdk.org/loom/commit/74822ce12acaf9816aa49b75ab5817ced3710776

8358183: [JVMCI] crash accessing nmethod::jvmci_name in CodeCache::aggregate

Reviewed-by: eastigeevich, phh

! src/hotspot/share/code/codeBlob.cpp
! src/hotspot/share/code/nmethod.cpp

Changeset: 1926aeb1
Branch: master
Author:    Takuya Kiriyama <tkiriyama at openjdk.org>
Date:      2025-07-03 06:47:11 +0000
URL:       https://git.openjdk.org/loom/commit/1926aeb1a3b39cf2e4ea48f4c489cd023b5aa77d

8352016: Improve java/lang/RuntimeTests/RuntimeExitLogTest.java

Reviewed-by: rriggs

+ test/jdk/java/lang/RuntimeTests/ExitLogging-ALL.properties
! test/jdk/java/lang/RuntimeTests/ExitLogging-FINE.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-FINER.properties
! test/jdk/java/lang/RuntimeTests/ExitLogging-INFO.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-OFF.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-SEVERE.properties
+ test/jdk/java/lang/RuntimeTests/ExitLogging-WARNING.properties
! test/jdk/java/lang/RuntimeTests/RuntimeExitLogTest.java

Changeset: 6c9236c8
Branch: master
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-03 06:59:00 +0000
URL:       https://git.openjdk.org/loom/commit/6c9236c80c236487a7c37dcb947c0f9192322208

8361238: G1 tries to get CPU info from terminated threads at shutdown

Reviewed-by: kbarrett, sangheki

! src/hotspot/share/runtime/java.cpp

Changeset: fd13e1ce
Branch: master
Author:    Jan Lahoda <jlahoda at openjdk.org>
Date:      2025-07-03 07:17:59 +0000
URL:       https://git.openjdk.org/loom/commit/fd13e1ce9805a903ab60ad9b476eb5a6687d22ee

8358801: javac produces class that does not pass verifier.

Reviewed-by: mcimadamore, liach

! src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java
+ test/langtools/tools/javac/patterns/T8358801.java

Changeset: c75df634
Branch: master
Author:    Beno?t Maillard <bmaillard at openjdk.org>
Committer: Emanuel Peter <epeter at openjdk.org>
Date:      2025-07-03 07:28:11 +0000
URL:       https://git.openjdk.org/loom/commit/c75df634be9a0073fa246d42e5c362a09f1734f3

8359602: Ideal optimizations depending on input type are missed because of missing notification mechanism from CCP

Reviewed-by: epeter, thartmann

! src/hotspot/share/opto/phaseX.cpp
+ test/hotspot/jtreg/compiler/c2/TestModControlFoldedAfterCCP.java

Changeset: 2f683fdc
Branch: master
Author:    Jatin Bhateja <jbhateja at openjdk.org>
Date:      2025-07-03 08:03:55 +0000
URL:       https://git.openjdk.org/loom/commit/2f683fdc4a8f9c227e878b0d7fca645fc8abe1b6

8361037: [ubsan] compiler/c2/irTests/TestFloat16ScalarOperations division by 0

Reviewed-by: mhaessig, sviswanathan

! src/hotspot/share/opto/divnode.cpp

Changeset: 1be29bd7
Branch: master
Author:    Jaikiran Pai <jpai at openjdk.org>
Date:      2025-07-03 09:32:09 +0000
URL:       https://git.openjdk.org/loom/commit/1be29bd725a4642b841c60c19f2f7f689a360831

8361060: Keep track of the origin server against which a jdk.internal.net.http.HttpConnection was constructed

Reviewed-by: dfuchs

! src/java.net.http/share/classes/jdk/internal/net/http/AbstractAsyncSSLConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/AsyncSSLConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/AsyncSSLTunnelConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/HttpConnection.java
+ src/java.net.http/share/classes/jdk/internal/net/http/Origin.java
! src/java.net.http/share/classes/jdk/internal/net/http/PlainHttpConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/PlainProxyConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/PlainTunnelingConnection.java
! src/java.net.http/share/classes/jdk/internal/net/http/common/Utils.java
+ test/jdk/java/net/httpclient/OriginTest.java
! test/jdk/java/net/httpclient/whitebox/java.net.http/jdk/internal/net/http/ConnectionPoolTest.java

Changeset: 2528c620
Branch: master
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2025-07-03 11:35:54 +0000
URL:       https://git.openjdk.org/loom/commit/2528c620a61195ac22d921b168444a7967bf1805

8361198: [AIX] fix misleading error output in thread_cpu_time_unchecked

Reviewed-by: mdoerr, azeller

! src/hotspot/os/aix/os_aix.cpp

Changeset: 5e40fb6b
Branch: master
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-03 11:43:35 +0000
URL:       https://git.openjdk.org/loom/commit/5e40fb6bda1d56e3eba584b49aa0b68096b34169

8277394: Remove the use of safepoint_workers in reference processor

Co-authored-by: Albert Mingkun Yang <ayang at openjdk.org>
Reviewed-by: ayang, iwalulya

! src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
! src/hotspot/share/gc/g1/g1FullCollector.cpp
! src/hotspot/share/gc/g1/g1YoungCollector.cpp
! src/hotspot/share/gc/parallel/psParallelCompact.cpp
! src/hotspot/share/gc/parallel/psScavenge.cpp
! src/hotspot/share/gc/serial/defNewGeneration.cpp
! src/hotspot/share/gc/serial/serialFullGC.cpp
! src/hotspot/share/gc/shared/referenceProcessor.cpp
! src/hotspot/share/gc/shared/referenceProcessor.hpp

Changeset: 24117c6e
Branch: master
Author:    Rajat Mahajan <rmahajan at openjdk.org>
Committer: Alexey Ivanov <aivanov at openjdk.org>
Date:      2025-07-03 14:24:52 +0000
URL:       https://git.openjdk.org/loom/commit/24117c6e9aa862bad839e93eff70810a75605ac5

8349188: LineBorder does not scale correctly

Co-authored-by: Alexey Ivanov <aivanov at openjdk.org>
Reviewed-by: aivanov, serb

! src/java.desktop/share/classes/javax/swing/border/LineBorder.java
! test/jdk/javax/swing/border/LineBorder/ScaledLineBorderTest.java
! test/jdk/javax/swing/border/LineBorder/ScaledTextFieldBorderTest.java

Changeset: 3daa03c3
Branch: master
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-03 15:31:34 +0000
URL:       https://git.openjdk.org/loom/commit/3daa03c30f8e6ab9c498edb7d59346ce0b30450f

8358680: AOT cache creation fails: no strings should have been added

Co-authored-by: Aleksey Shipilev <shade at openjdk.org>
Reviewed-by: coleenp, shade

! src/hotspot/share/classfile/stringTable.cpp
! src/hotspot/share/classfile/stringTable.hpp
! src/hotspot/share/compiler/compileBroker.cpp
! src/hotspot/share/compiler/compileBroker.hpp
! src/hotspot/share/compiler/compileTask.cpp
! src/hotspot/share/compiler/compileTask.hpp
! src/hotspot/share/runtime/mutexLocker.cpp
! src/hotspot/share/runtime/mutexLocker.hpp

Changeset: 66836d40
Branch: master
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-03 16:52:19 +0000
URL:       https://git.openjdk.org/loom/commit/66836d40b80f9c5482c1322d1d07f078ad9dcc02

8361292: Rename ModuleEntry::module() to module_oop()

Reviewed-by: coleenp, ccheung, sspitsyn

! src/hotspot/share/classfile/classFileParser.cpp
! src/hotspot/share/classfile/classLoaderDataShared.cpp
! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/classfile/moduleEntry.cpp
! src/hotspot/share/classfile/moduleEntry.hpp
! src/hotspot/share/classfile/modules.cpp
! src/hotspot/share/jfr/jni/jfrUpcalls.cpp
! src/hotspot/share/jvmci/jvmciCompiler.cpp
! src/hotspot/share/oops/arrayKlass.cpp
! src/hotspot/share/oops/klass.cpp
! src/hotspot/share/prims/jvmtiExport.cpp
! src/hotspot/share/runtime/reflection.cpp

Changeset: a2315ddd
Branch: master
Author:    Evgeny Nikitin <enikitin at openjdk.org>
Committer: Leonid Mesnik <lmesnik at openjdk.org>
Date:      2025-07-03 16:58:30 +0000
URL:       https://git.openjdk.org/loom/commit/a2315ddd2a343ed594dd1b0b3d0dc5b3a71f509b

8357739: [jittester] disable the hashCode method

Reviewed-by: lmesnik

! test/hotspot/jtreg/testlibrary/jittester/conf/exclude.methods.lst
+ test/hotspot/jtreg/testlibrary/jittester/src/jdk/test/lib/jittester/MethodTemplate.java
! test/hotspot/jtreg/testlibrary/jittester/src/jdk/test/lib/jittester/TypesParser.java
+ test/lib-test/jdk/test/lib/jittester/MethodTemplateTest.java

Changeset: 25ed36f3
Branch: master
Author:    Archie Cobbs <acobbs at openjdk.org>
Date:      2025-07-03 18:13:07 +0000
URL:       https://git.openjdk.org/loom/commit/25ed36f3ef1fe1d6914689c762910f104775f48c

8359493: Refactor how aggregated mandatory warnings are handled in the compiler
8350514: Refactor MandatoryWarningHandler to support dynamic verbosity

Reviewed-by: mcimadamore

! make/langtools/tools/propertiesparser/gen/ClassGenerator.java
! make/langtools/tools/propertiesparser/parser/Message.java
! make/langtools/tools/propertiesparser/parser/MessageLine.java
! make/langtools/tools/propertiesparser/resources/templates.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTaskPool.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Preview.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/MemoryContext.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/main/JavaCompiler.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/JCDiagnostic.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/Log.java
- src/jdk.compiler/share/classes/com/sun/tools/javac/util/MandatoryWarningHandler.java
+ src/jdk.compiler/share/classes/com/sun/tools/javac/util/WarningAggregator.java

Changeset: 2d9f0324
Branch: master
Author:    Brian Burkhalter <bpb at openjdk.org>
Date:      2025-07-03 18:53:59 +0000
URL:       https://git.openjdk.org/loom/commit/2d9f0324ba21adf216649339c48e49b9cd1e33ff

8360028: (fs) Path.relativize throws StringIndexOutOfBoundsException (win)

Reviewed-by: alanb

! src/java.base/windows/classes/sun/nio/fs/WindowsLinkSupport.java

Changeset: 003be0de
Branch: master
Author:    Calvin Cheung <ccheung at openjdk.org>
Date:      2025-07-03 19:40:22 +0000
URL:       https://git.openjdk.org/loom/commit/003be0dee2f6c190697ec0a923546362c50cc0e5

8361325: Refactor ClassLoaderExt

Reviewed-by: coleenp, sspitsyn

! src/hotspot/share/cds/archiveBuilder.cpp
! src/hotspot/share/cds/cdsProtectionDomain.cpp
! src/hotspot/share/cds/classListParser.cpp
! src/hotspot/share/cds/filemap.cpp
! src/hotspot/share/cds/heapShared.cpp
! src/hotspot/share/cds/metaspaceShared.cpp
! src/hotspot/share/classfile/classLoader.cpp
! src/hotspot/share/classfile/classLoader.hpp
- src/hotspot/share/classfile/classLoaderExt.cpp
- src/hotspot/share/classfile/classLoaderExt.hpp
! src/hotspot/share/classfile/modules.cpp
! src/hotspot/share/classfile/systemDictionary.cpp
! src/hotspot/share/classfile/systemDictionaryShared.cpp
! src/hotspot/share/prims/jvmtiEnv.cpp

Changeset: dcc7254a
Branch: master
Author:    Eric Caspole <ecaspole at openjdk.org>
Date:      2025-07-03 19:43:30 +0000
URL:       https://git.openjdk.org/loom/commit/dcc7254a38bb0fecacd7683682d4c42e49335222

8361213: J2DAnalyzer should emit the score as a decimal

Reviewed-by: prr

! src/demo/share/java2d/J2DBench/src/j2dbench/report/J2DAnalyzer.java

Changeset: 77e69e02
Branch: master
Author:    Erik Gahlin <egahlin at openjdk.org>
Date:      2025-07-03 20:01:33 +0000
URL:       https://git.openjdk.org/loom/commit/77e69e02ebd280636859dd698423db6ac3bc7f5c

8358750: JFR: EventInstrumentation MASK_THROTTLE* constants should be computed in longs

Reviewed-by: mgronlun

! src/jdk.jfr/share/classes/jdk/jfr/internal/EventInstrumentation.java
! test/jdk/jdk/jfr/api/metadata/annotations/TestThrottle.java

Changeset: 566279af
Branch: master
Author:    Chen Liang <liach at openjdk.org>
Date:      2025-07-03 20:49:05 +0000
URL:       https://git.openjdk.org/loom/commit/566279af49a7cf47e6030222e989417855caf1a9

8360022: ClassRefDupInConstantPoolTest.java fails when running in repeat

Reviewed-by: vromero

! test/langtools/tools/javac/jvm/ClassRefDupInConstantPoolTest.java

Changeset: da0a51ce
Branch: master
Author:    David Holmes <dholmes at openjdk.org>
Date:      2025-07-03 21:02:28 +0000
URL:       https://git.openjdk.org/loom/commit/da0a51ce97453a47b2c7d11e5206774232309e69

8357601: Checked version of JNI Release<type>ArrayElements needs to filter out known wrapped arrays

Reviewed-by: coleenp, jsjolen

! src/hotspot/os/windows/safefetch_windows.hpp
! src/hotspot/share/memory/guardedMemory.cpp
! src/hotspot/share/memory/guardedMemory.hpp
! src/hotspot/share/prims/jniCheck.cpp
+ test/hotspot/jtreg/runtime/jni/checked/TestCharArrayReleasing.java
+ test/hotspot/jtreg/runtime/jni/checked/libCharArrayReleasing.c

Changeset: 16af4733
Branch: master
Author:    Manukumar V S <mvs at openjdk.org>
Committer: Phil Race <prr at openjdk.org>
Date:      2025-07-03 22:32:23 +0000
URL:       https://git.openjdk.org/loom/commit/16af473397a7b3a6e6e33dd684d0d511168b989b

8361115: javax/swing/JComboBox/bug4276920.java unnecessarily throws Error instead of RuntimeException

Reviewed-by: prr

! test/jdk/javax/swing/JComboBox/bug4276920.java

Changeset: 854de8c9
Branch: master
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-07-03 23:54:05 +0000
URL:       https://git.openjdk.org/loom/commit/854de8c9c6a1d851c1788e5f2250fe0928c51ca4

8336147: Clarify CDS documentation about static vs dynamic archive

Reviewed-by: ccheung, shade

! src/java.base/share/man/java.md

Changeset: 21f2e9a7
Branch: master
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2025-07-04 04:08:42 +0000
URL:       https://git.openjdk.org/loom/commit/21f2e9a71c31320a8b1248e3970a82b871c63c2b

8344332: (bf) Migrate DirectByteBuffer away from jdk.internal.ref.Cleaner

Reviewed-by: rriggs, bchristi

! src/java.base/share/classes/java/nio/Bits.java
+ src/java.base/share/classes/java/nio/BufferCleaner.java
! src/java.base/share/classes/java/nio/Direct-X-Buffer.java.template
! src/java.base/share/classes/jdk/internal/misc/Unsafe.java
+ src/java.base/share/classes/sun/nio/Cleaner.java
! src/java.base/share/classes/sun/nio/ch/DirectBuffer.java
! src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
+ test/micro/org/openjdk/bench/java/nio/DirectByteBufferChurn.java
+ test/micro/org/openjdk/bench/java/nio/DirectByteBufferGC.java

Changeset: 5cf349c3
Branch: master
Author:    Doug Simon <dnsimon at openjdk.org>
Date:      2025-07-04 07:37:20 +0000
URL:       https://git.openjdk.org/loom/commit/5cf349c3b08324e994a4143dcc34a59fd81323f9

8361355: Negative cases of Annotated.getAnnotationData implementations are broken

Reviewed-by: never

! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaFieldImpl.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaMethodImpl.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaType.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedObjectTypeImpl.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedPrimitiveType.java
! src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/meta/ResolvedJavaType.java
! test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/TestResolvedJavaType.java

Changeset: 56ebb8c1
Branch: master
Author:    Jonas Norlinder <jonas.norlinder at oracle.com>
Committer: Thomas Schatzl <tschatzl at openjdk.org>
Date:      2025-07-04 10:16:55 +0000
URL:       https://git.openjdk.org/loom/commit/56ebb8c1b936e5a4c14486153c9f60df705095ad

8359110: Log accumulated GC and process CPU time upon VM exit

Co-authored-by: Erik ?sterlund <eosterlund at openjdk.org>
Co-authored-by: Jonas Norlinder <jnorlinder at openjdk.org>
Reviewed-by: tschatzl, ayang

! src/hotspot/os/posix/os_posix.cpp
! src/hotspot/os/windows/os_windows.cpp
! src/hotspot/share/gc/epsilon/epsilonHeap.hpp
! src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp
! src/hotspot/share/gc/serial/serialHeap.hpp
! src/hotspot/share/gc/shared/collectedHeap.cpp
! src/hotspot/share/gc/shared/collectedHeap.hpp
! src/hotspot/share/gc/shared/collectedHeap.inline.hpp
! src/hotspot/share/gc/shared/stringdedup/stringDedup.hpp
! src/hotspot/share/gc/shared/stringdedup/stringDedupProcessor.hpp
+ src/hotspot/share/gc/shared/vmThreadCpuTimeScope.hpp
+ src/hotspot/share/gc/shared/vmThreadCpuTimeScope.inline.hpp
! src/hotspot/share/runtime/java.cpp
! src/hotspot/share/runtime/os.hpp
! src/hotspot/share/runtime/vmThread.cpp

Changeset: fba74f79
Branch: master
Author:    Magnus Ihse Bursie <ihse at openjdk.org>
Date:      2025-07-04 12:19:24 +0000
URL:       https://git.openjdk.org/loom/commit/fba74f796eeeb42accc60ecab444c3d933b73e70

8361306: jdk.compiler-gendata needs to depend on java.base-launchers

Reviewed-by: shade

! make/Main.gmk

Changeset: f153e415
Branch: master
Author:    Manuel H?ssig <mhaessig at openjdk.org>
Date:      2025-07-04 13:06:36 +0000
URL:       https://git.openjdk.org/loom/commit/f153e415d740f4ede272929171e9bb3e73ddbe1c

8361253: CommandLineOptionTest library should report observed values on failure

Reviewed-by: dholmes, shade

! test/lib/jdk/test/lib/cli/CommandLineOptionTest.java

Changeset: 1c560727
Branch: master
Author:    Srinivas Vamsi Parasa <sparasa at openjdk.org>
Committer: Sandhya Viswanathan <sviswanathan at openjdk.org>
Date:      2025-07-04 15:08:57 +0000
URL:       https://git.openjdk.org/loom/commit/1c560727b850593561982ccc3ed37b0e98b3bbee

8360775: Fix Shenandoah GC test failures when APX is enabled

Reviewed-by: sviswanathan, jbhateja, epeter

! src/hotspot/cpu/x86/assembler_x86.cpp
! src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp

Changeset: f2d2eef9
Branch: master
Author:    Nizar Benalla <nbenalla at openjdk.org>
Date:      2025-07-04 15:10:22 +0000
URL:       https://git.openjdk.org/loom/commit/f2d2eef988c57cc9f6194a8fd5b2b422035ee68f

8177100: APIs duplicated in JavaDoc

Reviewed-by: liach, hannesw

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/VisibleMemberTable.java
+ test/langtools/jdk/javadoc/doclet/testDuplicateMethodsWarn/TestDuplicateMethods.java

Changeset: f3e0588d
Branch: master
Author:    Erik Gahlin <egahlin at openjdk.org>
Date:      2025-07-06 15:21:35 +0000
URL:       https://git.openjdk.org/loom/commit/f3e0588d0b825a68a4ad61ddf806877f46da69dc

8361338: JFR: Min and max time in MethodTime event is confusing

Reviewed-by: mgronlun

! src/jdk.jfr/share/classes/jdk/jfr/events/MethodTimingEvent.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/query/view.ini
! src/jdk.jfr/share/classes/jdk/jfr/internal/tracing/TimedClass.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/tracing/TimedMethod.java


From ryeats at gmail.com  Sat Jul  5 20:25:44 2025
From: ryeats at gmail.com (Ryan Yeats)
Date: Sat, 5 Jul 2025 13:25:44 -0700
Subject: Custom scheduler: Using loom for deterministic simulation testing
Message-ID: <CAO4jUyUObxU=NuMLabfEHt2MSBiWzjWEfncg0YKQNsukoKUgjg@mail.gmail.com>

Hi,
I have also been looking into deterministic simulation on the side and
belatedly saw some interest about it on the loom email list with the
"Custom scheduler: Customize current time and timed waits" thread. I wanted
to briefly expand on the topic of using Loom to make deterministic
simulation testing more easily available to the java community.

BLUF:  Deterministic simulation testing makes multi threaded logic single
threaded and fuzz tests the execution order, greatly simplifying discovery
of race conditions and deadlocks. See this blog post by Ao Li
<https://aoli.al/blogs/jdk-bug/> for an example doing this in java and the
paper behind it  Fray: An Efficient General-Purpose Concurrency Testing
Platform for the JVM <https://arxiv.org/abs/2501.12618>.

The above explanation omits how hard it is to actually make java or any
language deterministic. This is where James Baker had a clever idea
<https://jbaker.io/2022/05/09/project-loom-for-distributed-systems/> of
using Loom, since we could replace the virtual thread scheduler with a
deterministic one, Loom does most of the work for us without any extra
frameworks. This works brilliantly, however there are three main caveats:

   1. Its not easy to replace the virtual thread scheduler
   2. The aforementioned scheduler has no understanding of delays so any
   Thread.sleep or Object.wait introduces continuations back into the
   scheduled execution pool non-deterministically. This affects the execution
   order so bugs can't always be reproduced.
   3. IO also introduces continuations back to the scheduler execution pool
   non-deterministically.

The first issue can currently be solved by using reflection to make the virtual
thread constructor public
<https://github.com/ryeats/loom-dst/blob/main/src/main/java/org/example/SchedulableVirtualThreadFactory.java>.
The
second issue can currently be solved by controlling system time by
replacing the byte code for all calls to System.nanoTime(),
System.onCurrentTimeMillis() and Instant.now() using an agent at runtime
<https://github.com/cmu-pasta/fray/blob/main/instrumentation/base/src/main/kotlin/org/pastalab/fray/instrumentation/base/visitors/TimeInstrumenter.kt>.
The third likely has no general solution but I am interested in hearing
ideas.

Even if there is no solution to IO non-determinism and developers have to
stub out all IO, deterministic simulation is still an incredibly promising
tool for making concurrent and distributed systems programing much simpler
and safer. I think because of this use case there would be a lot of benefit
if the Loom API allowed instrumenting the scheduler, even better if we
could access the DELAYED_TASK_SCHEDULERS which understand delays.

Thank you for your time, I have been super excited to use virtual threads
and amazed by the ingenuity that brought them to java.

Ryan
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From alan.bateman at oracle.com  Mon Jul  7 16:14:22 2025
From: alan.bateman at oracle.com (Alan Bateman)
Date: Mon, 7 Jul 2025 17:14:22 +0100
Subject: Custom scheduler: Using loom for deterministic simulation testing
In-Reply-To: <CAO4jUyUObxU=NuMLabfEHt2MSBiWzjWEfncg0YKQNsukoKUgjg@mail.gmail.com>
References: <CAO4jUyUObxU=NuMLabfEHt2MSBiWzjWEfncg0YKQNsukoKUgjg@mail.gmail.com>
Message-ID: <2e29ad21-3bc0-4a42-a00f-8a523f2e2bcb@oracle.com>



On 05/07/2025 21:25, Ryan Yeats wrote:
> :
>
>  1. Its not easy to replace the virtual thread scheduler
>  2. The aforementioned scheduler has no understanding of delays so any
>     Thread.sleep or Object.wait introduces continuations back into the
>     scheduled execution pool non-deterministically. This affects the
>     execution order so bugs can't always be reproduced.
>  3. IO also introduces continuations back to the scheduler execution
>     pool non-deterministically.
>
> The first issue can currently be solved by using reflection to make 
> the virtual thread constructor public 
> <https://github.com/ryeats/loom-dst/blob/main/src/main/java/org/example/SchedulableVirtualThreadFactory.java>.?The 
> second issue can currently be solved by controlling system time by 
> replacing the byte code for all calls to System.nanoTime(), 
> System.onCurrentTimeMillis() and Instant.now() using an agent at 
> runtime 
> <https://github.com/cmu-pasta/fray/blob/main/instrumentation/base/src/main/kotlin/org/pastalab/fray/instrumentation/base/visitors/TimeInstrumenter.kt>. 
> The third likely has no general solution but I am interested in 
> hearing ideas.
>
There are experimental changes in the loom repo to allow the virtual 
thread scheduler be replaced or wrapped. There is also a prototype API 
to set a scheduler when creating a virtual Thread. There is a doc in the 
repo with more on this [1]. This project hasn't decided whether to 
expose anything so any reports from experiments would be useful to hear 
about.

-Alan

[1] 
https://github.com/openjdk/loom/blob/fibers/loom-docs/CustomSchedulers.md
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