[Bug 262587] panic: lock (sleep mutex) umtxql not locked @ /usr/src/sys/sys/umtxvar.h:262 on 14-current master-n253798-8cdecdecb43

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262587

--- Comment #9 from Mark Johnston <markj@FreeBSD.org> ---
Hmm, so we were in linux_futex_wait(), presumably having slept (op 137 or 128
are present in the dmesg, but aren't the last ops, last op 129 is a wakeup). 
We locked the chain before sleeping, and upon waking up we find we have the
wrong chain locked.  So presumably curthread->td_umtxq.uq_key.hash changed
while we were sleeping...

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