ZGC Crash

[Erik Osterlund]

Hi Mike,

Yes, the fix will be in JDK 17.

Thanks,
/Erik

On 7 Jun 2021, at 18:40, Mike Rettig <mike.rettig at gmail.com> wrote:


Erik,

Thank you for fixing this so quickly. Does this mean the fix will be in jdk 17?

Thanks!

Mike

On Mon, Jun 7, 2021 at 4:48 AM Erik Osterlund <erik.osterlund at oracle.com<mailto:erik.osterlund at oracle.com>> wrote:
I found the problem, and the issue has now been resolved in mainline.

Some inline cache cleaning code was not monotonic, allowing a race where the inline cache cleaning could be reverted, which would very much explain your crash log.

Thanks again for reporting the issue!

/Erik

On 2 Jun 2021, at 18:12, Erik Osterlund <erik.osterlund at oracle.com<mailto:erik.osterlund at oracle.com>> wrote:


Hi Mike,

Thanks for letting me know. I think I know what might have happened. Will get back to you soon after thinking a bit further.

Thanks,
/Erik

On 1 Jun 2021, at 17:30, Mike Rettig <mike.rettig at gmail.com<mailto:mike.rettig at gmail.com>> wrote:



>>A very interesting observation is that the last internal exception thrown is the following: /NoSuchMethodError'{0x0000100253de4a20}: static Lcom/company/nums/biz/compiler/VMethRequest;.<clinit>()V> (0x0000100253de4a20) thrown [open/src/hotspot/share/prims/jni.cpp, line 1210]

The NoSuchMethodError exceptions are being reported due to serialization. All the 'clinit' internal exceptions are for objects that are being serialized. The app isn't attempting to create the objects with JNI.

Any other questions that I can help with?

Mike



On Mon, May 31, 2021 at 10:13 AM Erik Österlund <erik.osterlund at oracle.com<mailto:erik.osterlund at oracle.com>> wrote:
Hi,

Mike, in the bug report, we have done some initial analysis now.
Could you please have a look at what we have written in the bug report?
I think we might rely on some further information from you. In
particular regarding the use of JNI to perform method calls. There are a
whole bunch of reported internal errors when looking up jmethodIDs in
the log, that look rather suspicious, with consequences that are hard to
predict without knowing a bit more.

Thanks,
/Erik

On 2021-05-31 10:48, Stefan Karlsson wrote:
> The bug is now available at:
> https://bugs.openjdk.java.net/browse/JDK-8267972
>
> StefanK
>
> On 2021-05-28 18:27, Mike Rettig wrote:
>> On Fri, May 28, 2021 at 11:22 AM Erik Osterlund
>> <erik.osterlund at oracle.com<mailto:erik.osterlund at oracle.com>>
>> wrote:
>>
>>> Hi Mike,
>>>
>>> Thank you for reporting this issue. Do you have a link to the specific
>>> crash report you submitted?
>>>
>>>
>> I only have the review id. Here is response from my bug report:
>>
>> "We will review your report and have assigned it an internal review ID :
>> 9070442. Depending upon the completeness of the report and our ability to
>> reproduce the problem, either a new bug will be posted, or we will
>> contact
>> you for further information."
>>
>> Thanks,
>>
>> Mike
>