Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757625AbXKKS3c (ORCPT ); Sun, 11 Nov 2007 13:29:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756725AbXKKS3M (ORCPT ); Sun, 11 Nov 2007 13:29:12 -0500 Received: from artax.karlin.mff.cuni.cz ([195.113.31.125]:45934 "EHLO artax.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756399AbXKKS3L (ORCPT ); Sun, 11 Nov 2007 13:29:11 -0500 Date: Sun, 11 Nov 2007 19:29:09 +0100 (CET) From: Mikulas Patocka To: Miklos Szeredi cc: a.p.zijlstra@chello.nl, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, wfg@mail.ustc.edu.cn Subject: Re: Temporary lockup on loopback block device In-Reply-To: Message-ID: References: <20071110145444.a6993df1.akpm@linux-foundation.org> <1194735752.5828.1.camel@lappy> X-Personality-Disorder: Schizoid MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 796 Lines: 25 > > Why are there over-limit dirty pages that no one is writing? > > Please do a sysrq-t, and cat /proc/vmstat during the hang. Those > will show us what exactly is happening. I did and I posted relevant information from my finding --- it looped in balance_dirty_pages. > I've seen this type of hang many times, and I agree with Peter, that > it's probably about loopback, and is fixed in 2.6.24-rc. On 2.6.23 it could happen even without loopback --- loopback just made it happen very often. 2.6.24 seems ok. Mikulas > Thanks, > Miklos > > - 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/