6-STABLE snapshot (background fsck) lock-up

[Kostik Belousov]

On Thu, Aug 17, 2006 at 09:53:28AM -0500, Eric Anderson wrote:
> On 08/17/06 07:30, Eric Anderson wrote:
> >On 08/17/06 07:25, Kostik Belousov wrote:
> >>On Thu, Aug 17, 2006 at 07:08:31AM -0500, Eric Anderson wrote:
> >>>I've seen this several times now, but this time I got a dump. 
> >>>Basically, the system comes up after unclean shutdown, throws a bunch of 
> >>>filesystems into the background fsck list, and begins 60 seconds later. 
> >>>   After some amount of time, the system will lock up, presumably hung 
> >>>waiting on locks.
> >>>
> >>>Here's some info:
> >>>lock type bufwait: EXCL (count 1) by thread 0xffffff0128812980 (pid 804) 
> >>>lock type getblk: EXCL (count 1) by thread 0xffffff0128812980 (pid 
> >>>804)Locked vnodes
> >>>
> >>>0xffffff01c5c9f000: tag ufs, type VREG
> >>>    usecount 1, writecount 0, refcount 13656 mountedhere 0
> >>>    flags (VV_SYSTEM)
> >>>    v_object 0xffffff01b09542a0 ref 0 pages 1691637
> >>>     lock type snaplk: EXCL (count 1) by thread 0xffffff0128812980 (pid 
> >>>804)
> >>>        ino 4, on dev label/vol4
> >>>
> >>>
> >>>
> >>>How can I use kgdb to get more debugging information from this?
> >>>
> >>Look at the
> >>http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
> >>for instructions for ddb.
> >>
> >>What is the date of the system checkout ?
> >
> >
> >6-STABLE from ~8/12/06.
> >
> >So there's not much that can be done with the vmcore?
> >
> >I'll add the options to my kernel config (I was missing a few), and I 
> >suppose wait for another deadlock.
> 
> Ok, had another one.  Here are screenshots:
> 
> http://www.googlebit.com/freebsd/snapshots/
> 
> Is it the sysctl that is triggering it?

Hmm, unbelievable. It would be much simpler for you to set up serial
console.

Anyway, you use g_journal, and the problem seems to be related to some
geom locking. pjd@ is the right person to contact. I added him to the Cc:.
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