Date: Mon, 11 Mar 2013 20:17:53 +0100
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: torrent hash failures since 3.9.0-rc1
Message-ID: <20130311191753.GA439@x4>
References: <20130311171824.GA434@x4>
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On 2013.03.11 at 18:18 +0100, Markus Trippelsdorf wrote:
> I get hash failures on "completed" torrents since 3.9.0-rc1 (Linux 3.8
> seems to be fine). What happens is that the torrents apparently complete
> successfully. After reboot however the hash check fails and there are
> missing (or corrupted) chunks. I've tested this with two different
> clients (rtorrent and aria2c) and both are affected. So I think this
> might be a filesystem issue.
> 
> /dev/sda       ext4      1.4T  666G  640G  51% /var
> /dev/sda on /var type ext4 (rw,noatime,data=ordered)
> 
> I use ECC memory (and there is nothing in the logs).

To reproduce this issue just do the following:

 % wget http://torrents.linuxmint.com/torrents/linuxmint-12-gnome-cd-nocodecs-64bit.iso.torrent
 % rtorrent linuxmint-12-gnome-cd-nocodecs-64bit.iso.torrent
 (Wait until the torrent finishes)
 % sudo echo 3 > /proc/sys/vm/drop_caches
 (Rehash the torrent (Ctrl-R))
 The torrent doesn't rehash successfully and a few hunks are
 missing/corrupted and need to be downloaded again.

-- 
Markus
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