kern/114676: snapshot creation panics: snapacct_ufs2: bad block

[Joerg Wunsch]

The following reply was made to PR kern/114676; it has been noted by GNATS.

From: Joerg Wunsch <j at uriah.heep.sax.de>
To: bug-followup at freebsd.org
Cc:  
Subject: Re: kern/114676: snapshot creation panics: snapacct_ufs2: bad block
Date: Mon, 30 Jun 2008 22:34:42 +0200

 FreeBSD-7-stable is completely unstable for me due to this panic.
 
 I used to have regular snapshots enabled on /var and /home.  While
 there has been random (and not quite reproducible) file corruption
 happened within snapshotted binary files in the past, after upgrading
 from FreeBSD 6.x to 7-stable, the system went completely unstable due
 to this panic.  It crashes every couple of days now.  I have already
 disabled the regular snapshots, but it's got a tendency for a complete
 hard lockup during startup after a crash.  The only remedy then is to
 manually fsck everything in single-user mode.
 
 Here's the dump information from the recent crash dumps:
 
 Dump header from device /dev/ad4s1b
   Architecture: i386
   Architecture Version: 2
   Dump Length: 317976576B (303 MB)
   Blocksize: 512
   Dumptime: Wed Jun 25 04:10:25 2008
   Hostname: uriah.heep.sax.de
   Magic: FreeBSD Kernel Dump
   Version String: FreeBSD 7.0-STABLE #5: Tue Jun 17 15:06:46 MET DST 2008
     r at uriah.heep.sax.de:/usr/obj/usr/src/sys/URIAH
   Panic String: snapacct_ufs2: bad block
   Dump Parity: 558154102
   Bounds: 42
   Dump Status: good
 Dump header from device /dev/ad4s1b
   Architecture: i386
   Architecture Version: 2
   Dump Length: 180707328B (172 MB)
   Blocksize: 512
   Dumptime: Mon Jun 30 22:05:09 2008
   Hostname: uriah.heep.sax.de
   Magic: FreeBSD Kernel Dump
   Version String: FreeBSD 7.0-STABLE #6: Mon Jun 30 21:24:35 MET DST 2008
     root at uriah.heep.sax.de:/usr/obj/usr/src/sys/URIAH
   Panic String: snapacct_ufs2: bad block
   Dump Parity: 859829782
   Bounds: 43
   Dump Status: good
 
 I'm going to avoid /any/ kind of snapshot (even dump -L) now just to
 get a stable system again (hopefully).
 
 -- 
 cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL
 
 http://www.sax.de/~joerg/                        NIC: JW11-RIPE
 Never trust an operating system you don't have sources for. ;-)