panic: System call lstat returning with 1 locks held

Kris Kennaway kris at
Wed Jan 16 01:55:49 PST 2008

Scot Hetzel wrote:
> On 1/15/08, Kostik Belousov <kostikbel at> wrote:
>> On Tue, Jan 15, 2008 at 07:52:12AM -0600, Scot Hetzel wrote:
>>> When I boot a Jan 13th or Jan 15th kernel, and then run
>>> /usr/local/etc/cvsup/ to update the local CVS repository, I
>>> get the following panic:
>>> panic: System call lstat returning with 1 locks held
>>> cpuid = 0
>>> KDB: enter: panic
>>> [thread ; pid 1240 tid 10031]
>>> stopped at kdb_enter+0x3d: movq $0,0x41b048(%rip)
>>> db> show alllocks
>>> db> show locks
>>> db> bt
>>> tracing pid 1240 tid 10031 td 0xffffff001c1ad360
>>> kdb_enter() at kdb_enter+0x3d
>>> panic() at panic+0x176
>>> syscalls() at syscalls+0x66d
>>> Xfast_syscalls() at Xfast_syscalls+0xab
>>> --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8009e87ec, rsp=
>>> 0x72ec50, rbp = 0x72ed28 ---
>> I think this could be related to the recent vn_lock()/VOP_LOCK() KPI changes.
>> Please, add DEBUG_VFS_LOCKS to the kernel config, and do the
>>         show lockedvnods
>> from the ddb prompt when the panic occurs. The witness does not track
>> the lockmgr locks.
> I added DEBUG_VFS_LOCKS to the kernel config file, rebuilt and
> installed the kernel.  After rebooting the system, I started the cvsup
> update for my local mirror, when the panic occured I received a
> similar panic to the one above.  When I used 'show lockedvnods' the
> only thing that was displayed was 'Locked vnodes' and that was it.
> I'm going to try a binary search to see if I can narrow the problem down.

Do you also have witness enabled?


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