From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiri Slaby Subject: Re: BUG at scsi_lib.c:1108 [Was: mmotm 2009-11-24-16-47 uploaded] Date: Wed, 25 Nov 2009 21:22:57 +0100 Message-ID: <4B0D9221.2050103@gmail.com> References: <200911250111.nAP1BFg5030254@imap1.linux-foundation.org> <4B0D4949.4090109@gmail.com> <1259162399.2535.8.camel@mulgrave.site> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-bw0-f227.google.com ([209.85.218.227]:55455 "EHLO mail-bw0-f227.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753423AbZKYUX0 (ORCPT ); Wed, 25 Nov 2009 15:23:26 -0500 In-Reply-To: <1259162399.2535.8.camel@mulgrave.site> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, mm-commits@vger.kernel.org, linux-scsi@vger.kernel.org, Jens Axboe , neilb@suse.de On 11/25/2009 04:19 PM, James Bottomley wrote: > On Wed, 2009-11-25 at 16:12 +0100, Jiri Slaby wrote: >> On 11/25/2009 01:47 AM, akpm@linux-foundation.org wrote: >>> The mm-of-the-moment snapshot 2009-11-24-16-47 has been uploaded to >> >> Hi, I'm hitting the BUG below in the past two -mmotm's >> (2009-11-24-16-47, 2009-11-17-14-03): > > So this looks like some type of bug in the barrier code. What the BUG_ON > is saying is that something sent us a REQ_TYPE_FS (which should be a > filesystem read or write) with no attached data, so we can't process it. > > I've cc'd Jens to see what he thinks. > > Could you bisect this to find the offending commit? Hmm. I bisected it twice to commit 1bebedd653e1bb0440ebf40724c55791c21ad7cc Merge: a8d5ddf 62fa36a Author: Stephen Rothwell Date: Wed Nov 25 17:42:47 2009 +1100 Merge remote branch 'md/for-next' It doesn't make sense at all. How can empty merge cause a regression? And md/for-next doesn't produce the BUG. After the 1st bisection I did git checkout 1bebedd653e1bb0440ebf40724c55791c21ad7cc and built it. It crashed. Then I did git bisect start 1bebedd origin/stable where origin is next. And got back to the 1bebedd by bisection. -- js Faculty of Informatics, Masaryk University Suse Labs, Novell