Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755215AbYCQHXf (ORCPT ); Mon, 17 Mar 2008 03:23:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752140AbYCQHX3 (ORCPT ); Mon, 17 Mar 2008 03:23:29 -0400 Received: from brick.kernel.dk ([87.55.233.238]:18350 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751042AbYCQHX2 (ORCPT ); Mon, 17 Mar 2008 03:23:28 -0400 Date: Mon, 17 Mar 2008 08:23:25 +0100 From: Jens Axboe To: Bartlomiej Zolnierkiewicz Cc: Linus Torvalds , Anders Eriksson , "Rafael J. Wysocki" , Ingo Molnar , Linux Kernel Mailing List Subject: Re: Linux 2.6.25-rc4 Message-ID: <20080317072324.GX17940@kernel.dk> References: <200803161907.04581.bzolnier@gmail.com> <200803161926.36169.bzolnier@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200803161926.36169.bzolnier@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1166 Lines: 31 On Sun, Mar 16 2008, Bartlomiej Zolnierkiewicz wrote: > On Sunday 16 March 2008, Bartlomiej Zolnierkiewicz wrote: > > [...] > > > I think that we are looking into completely wrong direction... > > Alt-SysRq-T traces that Anders posted shows that the system hangs inside > block layer, if not clearing DRQ would be the case we should see system > getting stuck inside IDE (or at least IDE commands timing out)... The bisect ends up pointing at IDE bits everytime, plus it's io scheduler independent. So I don't think a generic issue is very likely. > I really do think that it is the same hang-in-block-layer issue that > Ingo managed to hit once (his system was using libata)... There's no data to back any such conclusion up, that would be extremely hand wavy (at best). Ingo hit a hang in one boot out of hundreds to thousands. Anders can reproduce easily, should be easy enough to narrow down. -- 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/