[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 17:53:01 UTC

--- Comment #15 from Alexander Motin <mav@FreeBSD.org> ---
Dmitry, I've removed both PDROP and following umtxq_lock(&uq->uq_key).  Is lock
changes somehow during the msleep()?  I guessed it was made separate to move
umtx_abs_timeout_update() out of the lock.  Am I missing some lock oddity

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