From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754111Ab0CWDQ4 (ORCPT ); Mon, 22 Mar 2010 23:16:56 -0400 Received: from cantor2.suse.de ([195.135.220.15]:43539 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753560Ab0CWDQz (ORCPT ); Mon, 22 Mar 2010 23:16:55 -0400 Date: Tue, 23 Mar 2010 14:16:46 +1100 From: Neil Brown To: jin zhencheng Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: BUG:write data to degrade raid5 Message-ID: <20100323141646.2cfa68a3@notabene.brown> In-Reply-To: References: X-Mailer: Claws Mail 3.7.5 (GTK+ 2.18.7; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 19 Mar 2010 18:29:28 +0800 jin zhencheng wrote: > hi; > > i use kernel is 2.6.26.2 > > what i do as follow: > > 1, I create a raid5: > mdadm -C /dev/md5 -l 5 -n 4 /dev/sda /dev/sdb /dev/sdc /dev/sdd > --metadata=1.0 --assume-clean > > 2, dd if=/dev/zero of=/dev/md5 bs=1M & > > write data to this raid5 > > 3, mdadm --manage /dev/md5 -f /dev/sda > > 4 mdadm --manage /dev/md5 -f /dev/sdb > > if i faild 2 disks ,then the OS kernel display OOP error and kernel down > > > do somebody know why ? > > Is MD/RAID5 bug ? Certainly this is a bug. 2.6.26 is quite old now - it is possible that the bug has already been fixed. If you are able to post the oops message - possibly use a digital camera to get a photograph - then I can probably explain what is happening and whether it has been fixed. Thanks, NeilBrown