RFR: 8339725: Concurrent GC crashed due to GetMethodDeclaringClass [v12]

[Leonid Mesnik]

On Thu, 12 Sep 2024 06:43:50 GMT, Liang Mao <lmao at openjdk.org> wrote:

>> Hi,
>> 
>> It's a fix for 8339725. I think getting the oop from Klass::java_mirror() should use a ON_PHANTOM_OOP_REF decorator here which could make sure the oop would be kept alive in concurrent marking and return nullptr while in concurrent reference processing and unloading.
>> 
>> test/hotspot/jtreg/runtime and gc are clean.
>> 
>> Thanks,
>> Liang
>
> Liang Mao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove unused imports

test/hotspot/jtreg/serviceability/jvmti/GetMethodDeclaringClass/TestUnloadedClass.java line 32:

> 30:  * @requires (os.family == "linux") & (vm.debug != true)
> 31:  * @library /test/lib
> 32:  * @run main/othervm/timeout=300 TestUnloadedClass

please change to othervm to driver so only forked vm is run with all vm flags.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20907#discussion_r1757386625