System.out.println lead to assert(resolved_method->method_holder()->is_linked()) failed: must be linked

[Leslie Zhai]

Hi David,

Thanks for your kind response!


在 2018/12/13 上午11:26, David Holmes 写道:
> On 13/12/2018 12:58 pm, Leslie Zhai wrote:
>> Hi Coleen,
>>
>> System.out.println was added on purpose:
>
> You can't do that. You can't put any code in the Object constructor 
> (or various other places - static initializers etc) because nothing 
> else is initialized yet - including String, System etc etc. The code 
> will hit exceptions and try to throw but can't because the Exception 
> classes can't be initialized yet.

I will use other way to debug during vm initializing.


>
>
> The assert is what we always see when trying to throw an exception 
> before the VM is initialized enough to throw exceptions.
>
> Cheers,
> David
> ----
>
>> diff -r 8449dc3cbebe src/java.base/share/classes/java/lang/Object.java
>> --- a/src/java.base/share/classes/java/lang/Object.java    Mon Nov 12 
>> 15:34:21 2018 +0800
>> +++ b/src/java.base/share/classes/java/lang/Object.java    Thu Dec 13 
>> 10:40:33 2018 +0800
>> @@ -47,7 +47,9 @@
>>        * Constructs a new object.
>>        */
>>       @HotSpotIntrinsicCandidate
>> -    public Object() {}
>> +    public Object() {
>> +      System.out.println("DEBUG: on purpose");
>> +    }
>>
>>       /**
>>        * Returns the runtime class of this {@code Object}. The returned
>>
>> ----- 8< -------- 8< -------- 8< -------- 8< -------- 8< -------- 8< ---
>>
>> Then it lead to the assertion error, similar as:
>>
>> https://bugs.openjdk.java.net/browse/JDK-8069005
>>
>> $ ./build/linux-x86_64-normal-server-fastdebug/jdk/bin/java -version
>> # To suppress the following error report, specify this argument
>> # after -XX: or in .hotspotrc: SuppressErrorAt=/linkResolver.cpp:1380
>> #
>> # A fatal error has been detected by the Java Runtime Environment:
>> #
>> #  Internal Error 
>> (/home/zhaixiang/jdk/src/hotspot/share/interpreter/linkResolver.cpp:1380), 
>> pid=11090, tid=11091
>> #  assert(resolved_method->method_holder()->is_linked()) failed: must 
>> be linked
>>
>> ----- 8< -------- 8< -------- 8< -------- 8< -------- 8< -------- 8< ---
>>
>> But just add java.lang.Object initialization in bootstrapping the jvm 
>> couldn't fix the issue:
>>
>> diff -r 2c5bf37c8f8e src/hotspot/share/runtime/thread.cpp
>> --- a/src/hotspot/share/runtime/thread.cpp    Thu Dec 06 20:39:03 
>> 2018 +0800
>> +++ b/src/hotspot/share/runtime/thread.cpp    Thu Dec 13 10:44:56 
>> 2018 +0800
>> @@ -3524,6 +3524,7 @@
>>     // Initialize java_lang.System (needed before creating the thread)
>>     initialize_class(vmSymbols::java_lang_System(), CHECK);
>>     // The VM creates & returns objects of this class. Make sure it's 
>> initialized.
>> +  initialize_class(vmSymbols::java_lang_Object(), CHECK);
>>     initialize_class(vmSymbols::java_lang_Class(), CHECK);

The order of initialize_class give the illusion that java_lang_String, 
java_lang_System had been initilized.  Sorry for that!

Thanks,

Leslie Zhai


>> initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK);
>>     Handle thread_group = create_initial_thread_group(CHECK);
>>
>> Please give me some advice how to fix the issue, thanks a lot!
>>
>> Regards,
>>
>> Leslie Zhai
>>
>>