linux-ext4 - Re: ext4_mb_generate_buddy and double-free errors

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Date:	Thu, 12 Mar 2009 20:22:13 -0700
From:	Frank Mayhar <fmayhar@...gle.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Curt Wohlgemuth <curtw@...gle.com>, mrubin <mrubin@...gle.com>
Subject: Re: ext4_mb_generate_buddy and double-free errors

On Thu, 2009-03-12 at 21:03 -0500, Eric Sandeen wrote:
> Frank Mayhar wrote:
> > We're seeing errors like:
> >   EXT4-fs error (device sda3): ext4_mb_generate_buddy: EXT4-fs: group 3049: 21020 blocks in bitmap, 21529 in gd
> > 
> > Usually after this the system is cleaned and in the process we see many
> > "mb_free_blocks: double-free of inode x's block y(bit z in group d)".
> > (In fact, we see exactly as many of these as the difference between the
> > group and computed count of free blocks.)
> > 
> > It looks like the bitmap itself is getting messed up somehow, at least
> > enough to make the free count disagree with the map itself.  Has anyone
> > else seen something like this?  Any pointers as to where to look for
> > potential culprits?
> 
> Which kernel, for starters?

It's our development kernel, 2.6.26 plus as many of the ext4/jbd2
patches as we can comfortably pull in.
-- 
Frank Mayhar <fmayhar@...gle.com>
Google, Inc.

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