[jdk25] RFR: 8361827: [TESTBUG] serviceability/HeapDump/UnmountedVThreadNativeMethodAtTop.java throws OutOfMemoryError

[Richard Reingruber]

On Thu, 17 Jul 2025 08:21:56 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>>> The Systen.gc() might not trigger full GC.
>> 
>> Indeed. Might be better to use the Whitebox or start a dedicated VM.
>> 
>>> While not tjust o restrict heap for this test? 256M should be enough.
>> 
>> This would not help. The tests accumulate heap dumps until OOM. See reproducer.
>
> It might not be the perfect solution but it surely reduces the noise in our testing.
> So let's have this improvement in jdk25.
> In jdk26 we can change the test to use [WhiteBox::fullGC](https://github.com/openjdk/jdk/blob/18190519e73705281adf3f94d710d000e75b1729/test/lib/jdk/test/whitebox/WhiteBox.java#L561). What do you think?

I've created a draft pr: https://github.com/openjdk/jdk/pull/26363

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PR Review Comment: https://git.openjdk.org/jdk/pull/26343#discussion_r2212907841