[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: Thu, 17 Mar 2022 16:06:14 UTC

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |markj@FreeBSD.org
             Status|New                         |Open

--- Comment #2 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Masachika ISHIZUKA from comment #0)
The panic is:

panic: lock (sleep mutex) umtxql not locked @ /usr/src/sys/sys/umtxvar.h:262    
cpuid = 2                                                                       
time = 1647416763                                                               
KDB: stack backtrace:                                                           
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0101153c00  
vpanic() at vpanic+0x17f/frame 0xfffffe0101153c50                               
panic() at panic+0x43/frame 0xfffffe0101153cb0                                  
witness_unlock() at witness_unlock+0x144/frame 0xfffffe0101153cf0               
__mtx_unlock_flags() at __mtx_unlock_flags+0x4d/frame 0xfffffe0101153d20        
linux_sys_futex() at linux_sys_futex+0x5e1/frame 0xfffffe0101153e00             
amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe0101153f30                 
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0101153f30      
--- syscall (202, Linux ELF64, linux_sys_futex), rip = 0x803a0ba35, rsp =
0x8061d0c90, rbp = 0x8061d0dc0 ---

I'm not sure which call to umtxq_unlock() this corresponds to.

There are no changes to the linuxulator in that range of revisions, but your
version string is "master-n253798-8cdecdecb43-dirty", so you have some local
changes.  Any in the linuxulator?  If not, please try installing gdb and

# kgdb -q
(kgdb) list *linux_sys_futex+0x5e1

and show the output.

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