[Bug 228087] F_SETLK randomly fails on NFS4 in threaded operation in MySQL

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228087

--- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> ---
I don't recall seeing this PR before, so I'm
afraid it is "better late than never".

It so happens, that a recent bug/fix might be
what caused this.  It was a use-after-free of
open/lock owners in the housekeeping function
(which might have resulted in it processing the
wrong open/lock owner.)

The fix is committed to main as 1cedb4ea1a79
and will be in 13.1 when it is released.

If it is possible to redo your tests with FreeBSD13.1
once it is released and then report back here,
that would be appreciated.
(A code inspection did not find anything in
 the sources which might cause this.)

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