Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934090AbYCFNzs (ORCPT ); Thu, 6 Mar 2008 08:55:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759029AbYCFNzi (ORCPT ); Thu, 6 Mar 2008 08:55:38 -0500 Received: from brick.kernel.dk ([87.55.233.238]:8748 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758818AbYCFNzh (ORCPT ); Thu, 6 Mar 2008 08:55:37 -0500 Date: Thu, 6 Mar 2008 14:55:33 +0100 From: Jens Axboe To: Bartlomiej Zolnierkiewicz Cc: Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , "Rafael J. Wysocki" , Anders Eriksson Subject: Re: Linux 2.6.25-rc4 Message-ID: <20080306135532.GG17940@kernel.dk> References: <200803061438.22205.bzolnier@gmail.com> <20080306133347.GA23495@elte.hu> <200803061506.19449.bzolnier@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200803061506.19449.bzolnier@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1716 Lines: 43 On Thu, Mar 06 2008, Bartlomiej Zolnierkiewicz wrote: > On Thursday 06 March 2008, Ingo Molnar wrote: > > > > * Bartlomiej Zolnierkiewicz wrote: > > > > > The problem looks very similar to the one recently reported by Anders: > > > > > > http://lkml.org/lkml/2008/2/22/239 > > > > > > "Trying out 2.6.25-rc2 smartd always causes my box to hang. I can > > > switch vt:s and the keyboard seems to work. > > > > > > Using sysrq-e I noticed a callpath open -> ext3 -> journals -> > > > sync_buffer -> io_scheduel -> generic_unplig_device. I'd guess the > > > open stems from smartd. Removing smartd from the startup, I'm now > > > using rc2 fine..." > > > > > > Initially we thought that it is an IDE regression but after some > > > testing and further investigation it seems that IDE changes just made > > > it more likely to occur (yesterday it turned out that the kernel with > > > the "guilty" IDE commit sometimes boots fine). The issue is easily > > > reproducible. > > > > > > PS We've already verified that it is not PREEMPT related or a compiler > > > bug. > > > > smartd is not active here though - and starting/restarting it doesnt > > provoke a hang. > > I was a bit unclear on this, the problem is easily reproducible but _only_ > on Anders' system (I couldn't reproduce it with smartd here either). What IO scheduler is Anders using (and does it have an impact, eg does it hang with deadline as well)? -- Jens Axboe -- 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/