From: Cryptooctoploid Subject: Re: data corruption with ext4 (from 2.6.27.4) exposed by rtorrent Date: Mon, 3 Nov 2008 16:34:10 +0100 Message-ID: <319012f0811030734s6d14b2b3t13c32a41ac48e852@mail.gmail.com> References: <3d3ce57e0811030442o377cf2bet212eefba79d714bb@mail.gmail.com> <20081103134008.GE29102@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "Roc Valles" , linux-ext4@vger.kernel.org To: "Theodore Tso" Return-path: Received: from yw-out-2324.google.com ([74.125.46.28]:46764 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754033AbYKCPeM (ORCPT ); Mon, 3 Nov 2008 10:34:12 -0500 Received: by yw-out-2324.google.com with SMTP id 9so977791ywe.1 for ; Mon, 03 Nov 2008 07:34:10 -0800 (PST) In-Reply-To: <20081103134008.GE29102@mit.edu> Content-Disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, Nov 3, 2008 at 2:40 PM, Theodore Tso wrote: > On Mon, Nov 03, 2008 at 12:42:11PM +0000, Roc Valles wrote: >> Some person already reported this. I'm having the same problem. >> http://marc.info/?l=linux-ext4&m=122557056518246&w=2 >> >> rtorrent is a bittorrent client that makes heavy use of mmap instead >> of read/write to avoid needless duplication of data. It has exposed >> other bugs in the past (mmap bug in 2.6.19). >> http://libtorrent.rakshasa.no >> Downloading a big torrent (>2GB) with rtorrent triggers it more times >> than not. The bigger the torrent, the higher the likeliness of >> failure. When the torrent is finished, if a hash check is forced by >> pressing control-r on the torrent, some blocks will fail. I have set up a debug torrent at: http://www.demonoid.com/files/details/1676328/?rel=1225725960 It contains four identical files that were generated with: dd if=/dev/zero of=zero.test0 count=1M My upload speed is limited (512 kbit/s), but I hope this may help.