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

[Alan Bateman]

On Tue, 15 Mar 2022 14:56:29 GMT, Daniel D. Daugherty <dcubed 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.

Marked as reviewed by alanb (Reviewer).

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