RFR: 8339725: Concurrent GC crashed due to GetMethodDeclaringClass [v13]

[Leonid Mesnik]

On Fri, 13 Sep 2024 00:33:34 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:
> 
>   change main/othervm to driver

test/hotspot/jtreg/serviceability/jvmti/GetMethodDeclaringClass/TestUnloadedClass.java line 30:

> 28:  * @summary Stress test GetMethodDeclaringClass
> 29:  * @requires vm.jvmti
> 30:  * @requires (os.family == "linux") & (vm.debug != true)

Sorry, that missed initially. Why test is linux and non-debug only?
`* @requires (os.family == "linux") & (vm.debug != true)`

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PR Review Comment: https://git.openjdk.org/jdk/pull/20907#discussion_r1757810920