[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 18:11:16 UTC

--- Comment #17 from Dmitry Chagin <dchagin@FreeBSD.org> ---
Hi, Alexander! Yes, umtxq_requeue() relies on previous behaviour of
umtxq_sleep(), where the lock dropped and reacquired, as umtxq_requeue()
replaces the lock.
A year ago, we discussed this block with kib@ and decided that it was safe to
drop/acuire it.

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