From: Stefan Priebe - Profihost AG Subject: Re: ext4 hung tasks in linux-stable 3.0.41 Date: Fri, 31 Aug 2012 11:51:48 +0200 Message-ID: <50408934.9070305@profihost.ag> References: <50406B29.1090403@profihost.ag> <20120831092859.GB19786@quack.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: stable@vger.kernel.org, Greg KH , Theodore Tso , adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org To: Jan Kara Return-path: Received: from mail.profihost.ag ([85.158.179.208]:50146 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752005Ab2HaJvu (ORCPT ); Fri, 31 Aug 2012 05:51:50 -0400 In-Reply-To: <20120831092859.GB19786@quack.suse.cz> Sender: linux-ext4-owner@vger.kernel.org List-ID: Am 31.08.2012 11:28, schrieb Jan Kara: > Hello, > > On Fri 31-08-12 09:43:37, Stefan Priebe - Profihost AG wrote: >> i'm expected every night a hang of my rsync backup process, doing a >> backup to an ext4 filesystem. Always throwing Call traces. >> >> The hung task messages are really long so i posted it to pastebin: >> http://pastebin.com/raw.php?i=9v7HEvjA >> >> Used kernel: vanilla 3.0.41 >> >> Is this problem known? Or is there a fix for 3.0.X available? > From a quick look, processes are waiting for IO so it may be that your > disk is just loaded... Did it start happening after some change? Or do you > experience unexpectedly low performance? The main disk is XFS. The backup disk is ext4. The backup disk is doing nothing else than this SINGLE rsync task / process. So the only I/O is rsync itself. So i don't expect low performance as the main disk is XFS ;-) Greets, Stefan