linux-ext4 - Re: e2fsck aborts when invalid indirect block is encountered

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Message-Id: <6826A7C1-1DE4-4F0B-8654-201A3F6D1BF2@dilger.ca>
Date:	Thu, 1 Sep 2011 02:17:14 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Chen Huan <chenhuan@...hpc.ac.cn>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: e2fsck aborts when invalid indirect block is encountered

On 2011-09-01, at 12:34 AM, Chen Huan wrote:
> During a recent read-only checking of an corrupted ext3 file system,
> I found a strange behaviour of e2fsck: when an inode has an invalid
> indirect block number, e2fsck aborts with the following message:
> 
>    e2fsck 1.39 (29-May-2006)

Please retest with a new version of e2fsprogs.  The current release
version is 1.41.14, and the work-in-progress for version 1.42 is
available via Git.

>    Pass 1: Checking inodes, blocks, and sizes
>    Inode 12 has illegal block(s).  Clear? no
> 
>    Illegal block #-1 (4294967295) in inode 12.  IGNORED.
>    Error while iterating over blocks in inode 12: Illegal indirect block found
>    e2fsck: aborted
> 
> You can reproduce it with this code snippet:
> 
>    #!/bin/sh
> 
>    dev=/dev/sde
>    mnt=/mnt
> 
>    mkfs.ext3 -F $dev
>    mount $dev $mnt
>    dd if=/dev/zero of=$mnt/file bs=1M count=1
>    umount $dev
>    debugfs -w -R 'sif file block[IND] 0xFFFFFFFF' $dev
>    e2fsck -f -n $dev
> 
> Doing a fixing without -n option can safely delete this bad blocknum.
> 
> My question is: Is this behaviour a bug or intended?
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Cheers, Andreas





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