[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 #4 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Masachika ISHIZUKA from comment #3)
Hmm, the inlining of umtxq_unlock() makes this hard to identify.  Can you
obtain a kernel dump?  If not, you might try adding something like

  printf("linux futex op %d\n", args->op);

to the beginning of linux_futex(), and reproduce the crash.  That will make it
easier to narrow down the code path; there are many uses of umtxq_unlock() in
the futex code.

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