[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 #3 from Masachika ISHIZUKA <ish@amail.plala.or.jp> ---
(In reply to Mark Johnston from comment #2)
Thank you for reply.
I installed master-n253798-8cdecdecb43-dirty for two machines.
Both machines crashed with firefox with the same panic string.
Dirty is due to udf2 filesystems patch.
The below is another machine's output of kgdb.

carrot% su
carrot# kgdb -q
Reading symbols from /boot/kernel/kernel...
Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...
sched_switch (td=td@entry=0xffffffff81e8cde0 <thread0_st>, 
    flags=<optimized out>, flags@entry=260)
    at /usr/src/sys/kern/sched_ule.c:2245
2245                    cpuid = td->td_oncpu = PCPU_GET(cpuid);
(kgdb) list *linux_sys_futex+0x5e1
0xffffffff824f0bb1 is in linux_futex (/usr/src/sys/sys/umtxvar.h:262).
257     umtxq_unlock(struct umtx_key *key)
258     {
259             struct umtxq_chain *uc;
260
261             uc = umtxq_getchain(key);
262             mtx_unlock(&uc->uc_lock);
263     }
264
265     #endif /* _KERNEL */
266     #endif /* !_SYS_UMTXVAR_H_ */
(kgdb) q
carrot#

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