amd64/133977: [panic] [ffs] "panic: ffs_blkfree: freeing free block" after 7.0R->7.1R amd64 src upgrade [regression]

[freebsdpr]

The following reply was made to PR amd64/133977; it has been noted by GNATS.

From: freebsdpr <freebsdpr at satin.sensation.net.au>
To: bug-followup at FreeBSD.org, freebsdpr at sensation.net.au
Cc:  
Subject: Re: amd64/133977: [panic] [ffs] "panic: ffs_blkfree: freeing free
 block" after 7.0R->7.1R amd64 src upgrade [regression]
Date: Wed, 17 Jun 2009 13:27:20 +1000 (EST)

 I am also seeing this behaviour on a machine with 7.2-RELEASE (i386) 
 installed. A tech powered off the machine to replace a HD, rather than 
 cleanly shutting it down, so it now appears to be stuck in a reboot - fsck 
 - panic cycle. The file system has a lot of small files (at least a few 
 million) so fsck takes considerable time; I presume the sheer number of 
 blocks fsck is fixing/updating is eventually causing the panic.
 
 From vmcore.0:
 
 dev = mirror/gm0s1e, block = 424638984, fs = /var
 panic: ffs_blkfree: freeing free block
 
 df -ik:
 
 Filesystem         1024-blocks      Used     Avail Capacity  iused 
 ifree %iused  Mounted on
 /dev/mirror/gm0s1e   933330372 490280876 368383068    57% 10280264 
 110353078    9%   /var
 
 At this stage there seems to be no option but to disable soft updates for 
 any 7.1+ machine with a large (lots of files and/or large capacity + large 
 occupied capacity) file system...? I can't find any bug fix, but perhaps 
 I'm looking in the wrong places. Thanks.