linux-ext4 - Re: torrent hash failures since 3.9.0-rc1

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Date:	Mon, 11 Mar 2013 23:30:54 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Dave Jones <davej@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: torrent hash failures since 3.9.0-rc1

On Tue, Mar 12, 2013 at 11:00:58AM +0800, Zheng Liu wrote:
> 
> Thanks for reporting this problem.  My deepest apologies.
> 
> As Ted suggested, could you please try to use ext4 git tree?  I want to
> make sure whether this bug has been fixed by my lastest patch series or
> not.

It's definitely worth a try to compile the master branch of the ext4
tree and see if it reproduces or not.

However, I suspect the problem will still be there.  Based on the
commit which Markus has identified, I'm guessing it's a race between
the extents_status shrinker and writing into uninitialized region of
the file (since apprently compiling rtorrent with
--with-posix-fallocate is required).

Markus, how much memory do you have in your system?  That may be the
other reason why I haven't been able to reproduce it to date; I had a
lot of free memory when I tried to reproduce the problem, so the slab
shrinker didn't engage.

Regards,

						- Ted
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