RFR: 8291555: Replace stack-locking with fast-locking

[Thomas Stuefe]

On Sun, 7 Aug 2022 12:50:01 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> > Happens when the main thread detaches itself upon VM exit. VM attempts to release OMs that are owned by the finished main thread (side note: if that is the sole surviving thread, maybe that step could be skipped?). That happens before DestroyVM, so OM final audit did not yet run.
> > Problem here is the OM in use list is circular (and very big, ca 11mio entries).
> > I was able to reproduce it with a fastdebug build in 1 out of 5-6 runs. Also with less benchmark cycles (-r 3).
> 
> Hi Thomas, thanks for testing and reporting the issue. I just pushed an improvement (and simplification) of the monitor-enter-inflate path, and cannot seem to reproduce the problem anymore. Can you please try again with the latest change?

New version ran for 30 mins without crashing. Not a solid proof, but its better :-)

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PR: https://git.openjdk.org/jdk/pull/9680