Date: Mon, 21 Aug 2006 12:27:53 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: Kostik Belousov <kostikbel@gmail.com> Subject: Re: 6-STABLE snapshot (background fsck) lock-up Message-ID: <200608211227.54715.jhb@freebsd.org> In-Reply-To: <44E4614B.9000902@centtech.com> References: <44E45C3F.6060901@centtech.com> <20060817122502.GF1483@deviant.kiev.zoral.com.ua> <44E4614B.9000902@centtech.com>
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On Thursday 17 August 2006 08:30, 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? Actually, there is stuff that can be done with the vmcore. Download http://www.FreeBSD.org/~jhb/gdb.6 Then in kgdb do: (gdb) source /path/to/6.gdb (gdb) sleepchain 0xffffff0128812980 And see if that spits out a cycle. -- John Baldwin
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