From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755180AbZBONmu (ORCPT ); Sun, 15 Feb 2009 08:42:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753679AbZBONml (ORCPT ); Sun, 15 Feb 2009 08:42:41 -0500 Received: from mail-ausfall.charite.de ([193.175.70.131]:56293 "EHLO mail-ausfall.charite.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753867AbZBONml (ORCPT ); Sun, 15 Feb 2009 08:42:41 -0500 Date: Sun, 15 Feb 2009 14:42:35 +0100 From: Ralf Hildebrandt To: linux-kernel@vger.kernel.org Cc: Nick Piggin , Federico Cuello , Artem Bityutskiy Subject: Re: sync-Regression in 2.6.28.2? Message-ID: <20090215134235.GB15398@charite.de> Mail-Followup-To: linux-kernel@vger.kernel.org, Nick Piggin , Federico Cuello , Artem Bityutskiy References: <20090127093533.GB7037@charite.de> <200902051425.19552.nickpiggin@yahoo.com.au> <498AD368.2090000@lugmen.org.ar> <200902100045.44386.nickpiggin@yahoo.com.au> <20090209134958.GP27548@charite.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20090209134958.GP27548@charite.de> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ralf Hildebrandt : > > This patch seems good to me. If you would care to add a changelog and > > Signed-off-by: line, then we could get it merged? > > > > I am not too sure about this bug. I have reproduced a strange hang with > > ext4 (which does include sys_sync and write_cache_pages traces), and > > also turned up a lockdep report. Also, we haven't seen any reports of > > this problem on other filesystems. So it could be an ext4 bug. > > > > Your traces also have lots of tasks hung waiting for page lock. It is > > possible that wakeups get lost, which is fixed by this commit in > > mainline > > 777c6c5f1f6e757ae49ecca2ed72d6b1f523c007 > > > > Which might also be your bug. > > > > > > Any chance you can test this patch (as well as the existing patches > > you are using to fix write_cache_pages?). > > I could test 2.6.28.4 Still there in 2.6.28.5 :( -- Ralf Hildebrandt Ralf.Hildebrandt@charite.de Charite - Universitätsmedizin Berlin Tel. +49 (0)30-450 570-155 Geschäftsbereich IT | Abt. Netzwerk Fax. +49 (0)30-450 570-962 Hindenburgdamm 30 | 12200 Berlin