RFR: 8282704: runtime/Thread/StopAtExit.java may leak memory

[Daniel D.Daugherty]

On Thu, 17 Mar 2022 05:43:52 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Fix memory leak/pinning in runtime/Thread/StopAtExit.java stress test.
>> Change the test to:
>> - create and use its own ThreadGroup so it knows the expected thread count
>> - detect failures to cleanup the ThreadGroup
>> - these failures to cleanup can occur due to ThreadStop landing during Thread.exit()
>> 
>> The test uses reflection to call the package private ThreadGroup.threadTerminated()
>> or ThreadGroup.destroy() as needed. Sometimes the manual cleanup is not needed;
>> in a 30 second run, I typically see between 0-5 manual cleanups on my MBP13.
>
> Hi Dan,
> 
> This problem will go away when I fix:
> 
> https://bugs.openjdk.java.net/browse/JDK-8282952
> 
> Cheers,
> David

@dholmes-ora - Thanks for the review!

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PR: https://git.openjdk.java.net/jdk/pull/7819