panic: System call lstat returning with 1 locks held

Attilio Rao attilio at
Tue Feb 5 08:38:22 PST 2008

2008/2/5, Yar Tikhiy <yar at>:
> BTW, I seem to be hitting yet another lockmgr-related panic.
>  My system won't reboot under certain conditions: it'll panic instead
>  in vfs_unmountall().  Namely it will panic if I reboot from single-user
>  mode while it'll reboot OK from multi-user mode.  I have no idea
>  yet about the exact reason for the behaviour.  The output from kgdb
>  attached.
>  Note that this panic shouldn't be NTFS-related as I can trigger it
>  by typing `reboot' immediately after booting into single user.

Yes, sorry for this.
I know of this and I alredy patched my tree.
I did the WITNESS stuff based on the assumption drained lock will
never be release while they are. Unmounting is currently the only one
consumer of LK_DRAIN I know of and I just need to do a WITNESS_LOCK()
over there.
I will provide you an updated patch about this problem and another one
found by kris at .

I will look later at the backtrace so we can go on.


Peace can only be achieved by understanding - A. Einstein

More information about the freebsd-current mailing list