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

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 21 Mar 2022 15:29:27 UTC

--- Comment #10 from Mark Johnston <markj@FreeBSD.org> ---
There is an instance of FUTEX_CMP_REQUEUE (op 132).  This operation moves
sleeping threads from one umtx queue to another, possibly changing the queue
keys in the process.  This is implemented by umtx_requeue(), not used by the
native umtx interface in FreeBSD.  So this can certainly lead to the bug, since
umtxq_sleep() does not expect the queue hash to change.

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