linux-kernel - Re: torrent hash failures since 3.9.0-rc1

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Message-ID: <20130311211833.GC15478@thunk.org>
Date:	Mon, 11 Mar 2013 17:18:33 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Dave Jones <davej@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: torrent hash failures since 3.9.0-rc1

On Mon, Mar 11, 2013 at 09:46:25PM +0100, Markus Trippelsdorf wrote:
> > BTW, I'm currently running 3.9-rc2 with some additional fixes from the
> > ext4 dev branch, and I'm not able to reproduce the problem using
> > rtorrent on my laptop.  How reliably is it reproducing for you?  Are
> > you seeing the problem every time you try this?
> 
> Yes, it's 100% reproducible for me. If I boot a 3.8 kernel the issue
> vanishes.

Would you be willing to try an experiment? 

Try pulling down the master branch from the ext4 git tree here:

git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git

This contains all of the ext4 changes which are in 3.9-rc1, based on
top of 3.8-rc3.  See if it reproduces there.  If it does, then it
would tend to confirm the hypothesis that the issue was introduced by
one of the ext4 patches that we merged during the 3.9-rc1 merge
window... and then, since if you can reproduce the problem, if you
could do a git bisect to find the guilty commit, that would really
greatly appreciated.

If you can't reproduce it from the ext4.git tree, then the problem is
probably caused by some other change that was introduced between 3.8
and 3.9-rc1.

Thanks in advance,

					- Ted
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