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Date:	Fri, 14 Nov 2008 03:36:02 -0700
From:	Andreas Dilger <adilger@....com>
To:	Kelly Kane <kelly@...newdream.net>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Call traces on console from a test machine

On Nov 13, 2008  18:16 -0800, Kelly Kane wrote:
> In the mean time, fsck.ext4 is not liking our filesystem.
>
> Group descriptor 353 checksum is invalid.  Fix? yes
> Pass 2: CheckingEntry 'spice-and-wolf-si-tendra-segunda-temporada' in
>
 
> /liamsito1234/cibercomics.com/wp-content/cache/supercache/www.cibercomics.com/2008/10/05 
> (2152305) references inode
>                2901322 in group 354 where _INODE_UNINIT is set.
> Entry 'spice-and-wolf-si-tendra-segunda-temporada' in
>
 
> /liamsito1234/cibercomics.com/wp-content/cache/supercache/www.cibercomics.com/2008/10/05 
> (2152305) has
>                deleted/unused inode 2901322.  Clear? yes
> /dev/sdb1: e2fsck canceled.
> e2fsck: aborted
>
> Same block group each run through, different inode.
>
> I ran e2image and produced the following file:
>
> http://ext4dev.dreamhosters.com/watanabe-home-2008-11-13-1712.e2image.bz2
>
> Unfortunately I cannot mount the filesystem right now due to:
>
> EXT4-fs: ext4_check_descriptors: Checksum for group 353 failed  
> (23397!=52411)
> EXT4-fs: group descriptors corrupted!
> mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
>        missing codepage or other error       In some cases useful info  
> is found in syslog - try
>        dmesg | tail  or so
>
> Is there any hope for recovery of any of this data?

You can run "tune2fs -O ^uninit_bg /dev/XXX" to disable the group
descriptor checksums (and, unfortunately, the fast fsck benefits),
but at least it will allow you to mount the filesystem.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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