Date: Wed, 05 Jan 2011 16:21:27 +0000 From: Johannes Totz <jtotz@imperial.ac.uk> To: freebsd-fs@freebsd.org Subject: fsync: giving up on dirty & panic: snapacct_ufs2: bad block Message-ID: <ig25q7$rt2$1@dough.gmane.org>
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Hi, (beware of line breaks) # uname -a FreeBSD ib-sri11.XXX 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #0: Tue Dec 7 03:42:10 GMT 2010 root@ib-sri11.XXX:/usr/obj/usr/src/sys/GENERIC amd64 I got a "fsync: giving up on dirty" before xmas, during snapshot creation on a ufs2 volume: Dec 19 00:00:03 ib-sri11 kernel: fsync: giving up on dirty Dec 19 00:00:03 ib-sri11 kernel: 0xffffff00019b8ce8: tag devfs, type VCHR Dec 19 00:00:03 ib-sri11 kernel: usecount 1, writecount 0, refcount 313 mountedhere 0xffffff0001a5da00 Dec 19 00:00:03 ib-sri11 kernel: flags (VV_COPYONWRITE) Dec 19 00:00:03 ib-sri11 kernel: v_object 0xffffff0001aa3bd0 ref 0 pages 1238 Dec 19 00:00:03 ib-sri11 kernel: lock type devfs: EXCL by thread 0xffffff0030433460 (pid 79859) Dec 19 00:00:03 ib-sri11 kernel: dev ufs/root Google suggests this is harmless and the machine kept running happily for a while. There was enough space on ufs/root and I deleted all snapshots by hand. Last night the box started to panic with (transcribed from screenshot): panic: snappacct_ufs2: bad block cpuid = 1 KDB: stack backtrace: #0 0xffffffff805bf48c at kdb_backtrace+0x5c #1 0xffffffff80590200 at panic+0x1b4 #2 0xffffffff8079e88e at snapacct_ufs2+0xf2 #3 <omitted by me> at indiracct_ufs+0x1c9 #4 at indiracct_ufs+0x27c #5 at expunge_ufs2+0x2ee #6 at ffs_snapshot+0x1e9b #7 at ffs_mount+0x160c #8 at vfs_donmount+0xf8c #9 at nmount+0x6a #10 at syscallenter+0x2d9 #11 at syscall+0x38 #12 at Xfast_syscall+0xe2 Uptime: 1m45s Physical memory: 3313 MB Dumping 278 MB: No dumps available, the machine hangs after printing "Dumping 278 MB:". Looks like it crashes during background fsck (while creating the snapshot for it)? Don't know if these two are related... Is there anything to help debug this or is it known to be fixed in newer versions? Otherwise I just newfs this and restore from backup. Cheers, Johannes
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