[Bug 237195] pthread_mutex_unlock crash as unlocked mutex destroyed by signaled thread

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237195

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib at FreeBSD.org> ---
I was unable to reproduce the issue with your test program.

Regardless of it, there is indeed an access to the mutex memory after the
unlock.  Please try the attached patch and report back.  Note that seemingly
similar check in _mutex_leave_robust() only compares addresses.

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