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Date: Tue, 13 Mar 2012 15:57:50 -0400
From: "Ted Ts'o" <tytso@mit.edu>
To: Frej Eriksson <frej.eriksson@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Fwd: ext4 extents.c bug
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On Tue, Mar 13, 2012 at 08:39:56PM +0100, Frej Eriksson wrote:
> [  950.128885] ------------[ cut here ]------------
> [  950.128893] kernel BUG at /build/buildd/linux-2.6.35/fs/ext4/extents.c:1971!

Your file system is corrupted, and there are two bugs.  (1) e2fsck
wasn't detecting this form of file system corruption (a zero-length
extent entry), and (2) the kernel was not noticing until an assertion
check using BUG_ON, instead of flagging this as a file systme error.

The fixes for both of these problems, in the kernel and in e2fsprogs,
are here:

    http://article.gmane.org/gmane.comp.file-systems.ext4/31359
    http://article.gmane.org/gmane.comp.file-systems.ext4/31360

Best regards,

						- Ted