linux-ext4 - Re: e2fsck doesn't repair broken ext4

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Message-ID: <4B9AD66D.1070802@redhat.com>
Date:	Fri, 12 Mar 2010 18:03:57 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Jörg Sommer <joerg@...a.gnuu.de>
CC:	"Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger@....com>,
	linux-ext4@...r.kernel.org
Subject: Re: e2fsck doesn't repair broken ext4

Eric Sandeen wrote:
> Jörg Sommer wrote:
>> Hi,
>>
>> after a system crash, I had a problem with ext4 that e2fsck didn't fix. I
>> don't know if e2fsck or ext4 was wrong. In the end, I had to remove the
>> broken directory, which succeed and solved my problem.
>>
>> These are the steps I did:
>>
>> 01 % e2fsck -fy /dev/root
>> 02 % dumpe2fsck -x /dev/root
>> 03 % e2image -r /dev/root
> 
> Great, thanks for gathering the images.
> 
> What version of e2fsprogs were you using?

Ok never mind on that.  recent release has the same problem.

so this is 2.6.33-rc7 ...

you had:

[  347.673207] EXT4-fs error (device hda4): make_indexed_dir: invalid rec_len for '..' in inode 425166
(wish we'd print out the actual bad rec_len there ...)

# mount -o loop 03-e2image-r  mount/
# find mount/ -inum 425166
# mount/usr/share/ri/1.8/system/String
# touch mount/usr/share/ri/1.8/system/String/foobar
touch: cannot touch `mount/usr/share/ri/1.8/system/String/foobar': Input/output error
# dmesg | tail -n 1
EXT4-fs error (device loop0): make_indexed_dir: invalid rec_len for '..' in inode 425166
# debugfs 03-e2image-r

debugfs:  ls -l <425166>
 425166   40755 (2)      0      0    4096 11-Mar-2010 05:37 .
 424052   40755 (2)      0      0    4096  1-Feb-2010 16:53 ..
      0       0 (2)      0      0       0                   ..
      0       0 (2)      0      0       0                   .
 426379  100644 (1)      0      0    8494 10-Jan-2010 09:01 cdesc-String.yaml
 426380  100644 (1)      0      0     293 10-Jan-2010 09:01 new-c.yaml
...

Not sure what's going on with the duplicate 0-inode entries there yet.

-Eric

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