Date: Mon, 21 Aug 2006 20:33:43 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Eric Anderson <anderson@centtech.com> Cc: freebsd-hackers@freebsd.org Subject: Re: 6-STABLE snapshot (background fsck) lock-up Message-ID: <20060821173343.GJ56637@deviant.kiev.zoral.com.ua> In-Reply-To: <200608211227.54715.jhb@freebsd.org> References: <44E45C3F.6060901@centtech.com> <20060817122502.GF1483@deviant.kiev.zoral.com.ua> <44E4614B.9000902@centtech.com> <200608211227.54715.jhb@freebsd.org>
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[-- Attachment #1 --] On Mon, Aug 21, 2006 at 12:27:53PM -0400, John Baldwin wrote: > 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. In fact, I just committed the fix that shall help with snapshots on AMD64. Please, try sys/ufs/ffs/ffs_snapshot.c, rev. 1.128. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFE6e52C3+MBN1Mb4gRAgDeAKCogNpFLb1BH5ptFcRoU4T37LaaCACfV2sR L30EUWaDl8tpqbP2sEK1sa4= =LwT6 -----END PGP SIGNATURE-----help
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