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Date:	Thu, 6 Nov 2008 15:45:21 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Solofo.Ramangalahy@...l.net,
	Jindrich Makovicka <makovick@...il.com>,
	linux-ext4@...r.kernel.org
Subject: Re: data corruption with ext4 (from 2.6.27.4) exposed by rtorrent

On Wed, Nov 05, 2008 at 03:42:23PM -0500, Theodore Tso wrote:
> On Wed, Nov 05, 2008 at 09:21:00PM +0100, Solofo.Ramangalahy@...l.net wrote:
> > Solofo.Ramangalahy@...l.net writes:
> >  >  > The next question is whether the problem is more easily triggerred
> >  >  > when under memory pressure.
> >  > 
> >  > I was currently testing other kernels, but, right, I will retest with more memory.
> > 
> > with -m 2048 I do not observe the problem.
> > 
> > I should add that with 2.6.28-rc3 + ext4 patch queue, I am observing
> > what seems to be lockdep bug:
> > [   31.603020] BUG: key c9f315a8 not in .data!
> 
> Aneesh has some new patches in the ext4 patch queue that add new
> lockdep annotations.  I'm guessing there's a problem there.  Aneesh,
> can you look into this?  Solofo, can you send the .config you used
> in case it was unique to replicating the problem?

The patch aneesh-9-fix-lockdeep-recursive-locking-warning
should add the key in .data.  Do you have a stack trace ?
Can you find out which lock the lockdep is warning about

-aneesh
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