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

[Stefan Karlsson]

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

The HotSpot code change looks good. I haven't reviewed the test code.

-------------

Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20907#pullrequestreview-2301097681