Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759267Ab1D2PhX (ORCPT ); Fri, 29 Apr 2011 11:37:23 -0400 Received: from cantor2.suse.de ([195.135.220.15]:36813 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750838Ab1D2PhV (ORCPT ); Fri, 29 Apr 2011 11:37:21 -0400 Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback related. From: James Bottomley To: sedat.dilek@gmail.com Cc: Chris Mason , linux-fsdevel , linux-mm , linux-kernel In-Reply-To: References: <1303920553.2583.7.camel@mulgrave.site> <1303921583-sup-4021@think> <1303923000.2583.8.camel@mulgrave.site> <1303923177-sup-2603@think> <1303924902.2583.13.camel@mulgrave.site> Content-Type: text/plain; charset="UTF-8" Date: Fri, 29 Apr 2011 10:37:16 -0500 Message-ID: <1304091436.2559.8.camel@mulgrave.site> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1359 Lines: 33 On Fri, 2011-04-29 at 12:23 +0200, Sedat Dilek wrote: > But as I see these RCU (CPU) stalls, the patch from [1] might be worth a try. > First, I have seen negative effects on my UP-system was when playing > with linux-next [2]. > It was not clear what the origin was and the the side-effects were > somehow "bizarre". > The issue could be easily reproduced by tar-ing the kernel build-dir > to an external USB-hdd. > The issue kept RCU and TIP folks really busy. > Before stepping 4 weeks in the dark, give it a try and let me know in > case of success. Well, it's highly unlikely because that's a 2.6.39 artifact and the bug showed up in 2.6.38 ... I tried it just in case with no effect, so we know it isn't the cause. > For the systemd/cgroups part of the discussion (yes, I followed this > thread in parallel): > The patch from [4] might be interesting (untested here). What makes you think that? This patch is about rcu problems in cgroup manipulation through the mounted cgroup control filesystems. The bug in question manifests when all of that is quiescent, so it's not likely to be related. James -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/