linux-ext4 - Re: [Bug 42859] New: kernel BUG at fs/ext4/extents.c:1953

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Message-ID: <20120305015121.GB9087@thunk.org>
Date:	Sun, 4 Mar 2012 20:51:21 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Matthias Erll <merll@....de>
Cc:	linux-ext4@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org
Subject: Re: [Bug 42859] New: kernel BUG at fs/ext4/extents.c:1953

On Sun, Mar 04, 2012 at 11:11:00PM +0100, Matthias Erll wrote:
> 
> In the three cases I can reproduce, the inode number has been identical.
> Please find the debugfs output below.

Thanks, this is helpful.  It is indeed a bug in e2fsck; it's not
noticing the case where the extent length is zero (but the extent
header was still valid).  The workaround is to run the following
commands with the file system unmounted:

# debugfs -w -R "clri <1312385>" /dev/sda2
# e2fsck -f /dev/sda2

I'll get this fixed in the next maintenance release of e2fsprogs.

     	      	       	   	- Ted
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