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

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 262587] panic: lock (sleep mutex) umtxql not locked @ /usr/src/sys/sys/umtxvar.h:262 on 14-current master-n253798-8cdecdecb43"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 21 Mar 2022 18:07:59 UTC

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

--- Comment #16 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Alexander Motin from comment #15)
The lock can change if umtxq_requeue() moves the queue to a different hash
chain.    With PDROP, the subsequent umtxq_lock(&uq->uq_key) will lock the new
chain.  Right now we are re-locking the old one.

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