linux-ext4 - Re: 2.6.18-mm2: ext3 BUG?

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Message-ID: <20061023104141.GB3162@atrey.karlin.mff.cuni.cz>
Date:	Mon, 23 Oct 2006 12:41:41 +0200
From:	Jan Kara <jack@...e.cz>
To:	Jan-Benedict Glaw <jbglaw@...-owl.de>
Cc:	Andrew Morton <akpm@...l.org>, Jiri Slaby <jirislaby@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sct@...hat.com, adilger@...sterfs.com, linux-ext4@...r.kernel.org
Subject: Re: 2.6.18-mm2: ext3 BUG?

  Hello,

> On Wed, 2006-10-11 12:42:02 +0200, Jan Kara <jack@...e.cz> wrote:
> > > On Sun, 2006-10-08 08:33:30 +0200, Jan-Benedict Glaw <jbglaw@...-owl.de> wrote:
> > > While I could reproduce it with a 200MB file, it seems I can't break
> > > it with a 10MB file.
> >   Hmm, I was running the test for several ours without any problem...
> > The kernel is 2.6.17.6, ext3 in ordered data mode, standard SATA disk. I'm
> > now running it again and trying my luck ;). What is your testing environment?
> 
> kolbe34-backup:/mnt# uname -a
  Thanks for info. This looks pretty similar to what I have (only that
I have Athlon).

> Still running Debian's 2.6.17-2-686, I'm now tracking down the file
> size when I start to see this type of corruption. Right now, it seems
> I never get it with a 16384 KB (16 MB) large file, but I get it with a
> 21504 KB (21 MB) file.
> 
> Is there something important that changes handling of file contents in
> the 16..21 MB range?
  Umm, I've checked and found nothing obvious. We already have to use
double-indirect block at 16MB, maybe reservation code does some
distiction. Could you mount the filesystem with -o 'noreservation' and
see whether you can still reproduce the problem? Also it may be useful
to find out, whether you see the failure also with some older kernels...

								Honza
> 
> dumpe2fs output at http://lug-owl.de/~jbglaw/ext3-dumpe2fs.txt for
> that filesystem.  I'll now run with a 18.5 MB file...
> 
> MfG, JBG
> 
> -- 
>       Jan-Benedict Glaw      jbglaw@...-owl.de              +49-172-7608481
>   Signature of:                           Wenn ich wach bin, träume ich.
>   the second  :


-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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