Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932960AbXAWK4a (ORCPT ); Tue, 23 Jan 2007 05:56:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932959AbXAWK4a (ORCPT ); Tue, 23 Jan 2007 05:56:30 -0500 Received: from lucidpixels.com ([75.144.35.66]:58618 "EHLO lucidpixels.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S932957AbXAWK43 (ORCPT ); Tue, 23 Jan 2007 05:56:29 -0500 Date: Tue, 23 Jan 2007 05:56:28 -0500 (EST) From: Justin Piszcz X-X-Sender: jpiszcz@p34.internal.lan To: Neil Brown cc: Chuck Ebbert , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, xfs@oss.sgi.com Subject: Re: Kernel 2.6.19.2 New RAID 5 Bug (oops when writing Samba -> RAID5) In-Reply-To: <17845.13256.284461.992275@notabene.brown> Message-ID: References: <45B5261B.1050104@redhat.com> <17845.13256.284461.992275@notabene.brown> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1563 Lines: 45 On Tue, 23 Jan 2007, Neil Brown wrote: > On Monday January 22, cebbert@redhat.com wrote: > > Justin Piszcz wrote: > > > My .config is attached, please let me know if any other information is > > > needed and please CC (lkml) as I am not on the list, thanks! > > > > > > Running Kernel 2.6.19.2 on a MD RAID5 volume. Copying files over Samba to > > > the RAID5 running XFS. > > > > > > Any idea what happened here? > .... > > > > > Without digging too deeply, I'd say you've hit the same bug Sami Farin > > and others > > have reported starting with 2.6.19: pages mapped with kmap_atomic() > > become unmapped > > during memcpy() or similar operations. Try disabling preempt -- that > > seems to be the > > common factor. > > That is exactly the conclusion I had just come to (a kmap_atomic page > must be being unmapped during memcpy). I wasn't aware that others had > reported it - thanks for that. > > Turning off CONFIG_PREEMPT certainly seems like a good idea. > > NeilBrown > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Is this a bug that can or will be fixed or should I disable pre-emption on critical and/or server machines? Justin. - 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/