Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753416Ab1DUHZ4 (ORCPT ); Thu, 21 Apr 2011 03:25:56 -0400 Received: from 0122700014.0.fullrate.dk ([95.166.99.235]:37635 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751318Ab1DUHZz convert rfc822-to-8bit (ORCPT ); Thu, 21 Apr 2011 03:25:55 -0400 References: <20110420125824.GA3507@tiehlicka.suse.cz> <4DAEDBEB.7060904@fusionio.com> <20110420132903.GA13554@tiehlicka.suse.cz> <4DAF18DF.9080205@fusionio.com> <20110421071642.GA3556@tiehlicka.suse.cz> In-Reply-To: <20110421071642.GA3556@tiehlicka.suse.cz> Mime-Version: 1.0 (iPad Mail 8G4) Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset=us-ascii Message-Id: <5F35AAD2-8277-44BD-86B6-B1D7B816071E@kernel.dk> Cc: Jens Axboe , Linus Torvalds , LKML X-Mailer: iPad Mail (8G4) From: Jens Axboe Subject: Re: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: cfq_insert_request+0x1d/0x3f5 Date: Thu, 21 Apr 2011 09:25:57 +0200 To: Michal Hocko Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1537 Lines: 40 On 21/04/2011, at 09.16, Michal Hocko wrote: > On Wed 20-04-11 19:33:19, Jens Axboe wrote: >> On 2011-04-20 15:29, Michal Hocko wrote: >>> On Wed 20-04-11 15:13:15, Jens Axboe wrote: >>>> On 2011-04-20 14:58, Michal Hocko wrote: > [...] >>>>> [ 31.207888] Oops: 0000 [#1] PREEMPT [ 31.208186] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/queue/scheduler >>>> >>>> Ahh hang on, this may be a good clue. Does your boot scripts change the >>>> IO scheduler? >>> >>> Good one... >>> Yes, I have: >>> echo deadline > /sys/block/sda/queue/scheduler >>> in /etc/rc.local >>> >>> I am able to boot after I remove it. This is the first time I have seen >>> "last sysfs file" being useful. >>> Still want me to test the patch from the other email? >> >> Is this a new addition to your system? IOW, how certain are you that >> this is a regression that occured between rc3 and rc4? > > No, I am setting the scheduler this way for quite some time. If I use it > rc4 explodes while rc3 boots just fine. I am wondering, can this be a > timing issue? I am able to set the scheduler after system settles down > after boot and kde starts. > > I am going to bisect, let's see if I can find anything. Thanks, that would be great! Jens -- 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/