[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: Wed, 16 Mar 2022 08:07:22 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262587

            Bug ID: 262587
           Summary: panic: lock (sleep mutex) umtxql not locked @
                    /usr/src/sys/sys/umtxvar.h:262 on 14-current
                    master-n253798-8cdecdecb43
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ish@amail.plala.or.jp

Created attachment 232481
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232481&action=edit
/var/crash/textdump.tar.last

It was working on master-n253404-05c3e8e8714.
Today, I updated to master-n253798-8cdecdecb43, it panicked with 'Panic String:
lock (sleep mutex) umtxql not locked @ /usr/src/sys/sys/umtxvar.h:262' after
starting firefox.

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