linux-kernel - Re: 2.6.23-git18: ext2_check_page: bad entry in directory

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Date:	Wed, 24 Oct 2007 15:59:00 +0200
From:	Jan Kara <jack@...e.cz>
To:	Andy Whitcroft <andyw@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Subject: Re: 2.6.23-git18: ext2_check_page: bad entry in directory

  Hello,

On Wed 24-10-07 14:15:40, Andy Whitcroft wrote:
> Seems that we are now getting strange errors mounting an ext2 root
> filesystem under 2.6.23-git18:
> 
>   EXT2-fs error (device sda1): ext2_check_page: bad entry in directory #2:
>   rec_len is smaller than minimal - offset=0, inode=0, rec_len=0,
>   name_len=0
  Hmm, zero length entry in a root directory. Not nice.

> This seems to be occuring consistently since 2.6.23-git18.  I have been
> back and rerun a -git17 job to confirm its not visible at that level.
> This bug is expressing itself in 2.6.23-rc1 also.
> 
> I am suspicious of this commit in the -git17 -> -git18 block:
> 
>   commit 89910cccb8fec0c1140d33a743e72a712efd4f05
>   Author: Jan Kara <jack@...e.cz>
>   Date:   Sun Oct 21 16:41:40 2007 -0700
> 
>       ext2: avoid rec_len overflow with 64KB block size
> 
> /me goes debug this a bit more.
  Hmm, I'd suspect that too ;) But I swear I actually tested the code ;)
So what are you using the filesystem for (or do you get the error
immediately when mounting)? How large is the filesystem?

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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