Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756224Ab2FFOsm (ORCPT ); Wed, 6 Jun 2012 10:48:42 -0400 Received: from mail-qa0-f49.google.com ([209.85.216.49]:34405 "EHLO mail-qa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753807Ab2FFOsk (ORCPT ); Wed, 6 Jun 2012 10:48:40 -0400 MIME-Version: 1.0 In-Reply-To: <1338992680.29947.YahooMailNeo@web122006.mail.ne1.yahoo.com> References: <1338992680.29947.YahooMailNeo@web122006.mail.ne1.yahoo.com> Date: Wed, 6 Jun 2012 22:48:38 +0800 Message-ID: Subject: Re: file corruption in loop device in 3.4.0 From: Ming Lei To: Bob Sullivan Cc: "linux-kernel@vger.kernel.org" Content-Type: multipart/mixed; boundary=e89a8fb202a0d02e1204c1cedcf6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15456 Lines: 225 --e89a8fb202a0d02e1204c1cedcf6 Content-Type: text/plain; charset=ISO-8859-1 On Wed, Jun 6, 2012 at 10:24 PM, Bob Sullivan wrote: > We have a EXT3 filesystem contained in a file > (a disk image mapped to a file using loop device). > Using diff, observed random differences between > files on the image and a backup copies of those files. > This problem is reproducible, > tried booting several times with 3.3.8 and 3.4.0. > No problems on 3.3.8. A bit different with me, no problems on 3.4, but have problems on 3.5-rc1. I can easily reproduce the problem, just kernel boot and mount rootfs(ext4), then reboot again and found there are many rootfs errors as below, see attachment for fsck check result. [ 22.451385] EXT4-fs error (device mmcblk0p2): ext4_mb_generate_buddy:741: group 2, 0 clusters in bitmap, 1 in gd [ 23.263092] JBD2: Spotted dirty metadata buffer (dev = mmcblk0p2, blocknr = 0). There's a risk of filesystem corruption in case of system crash. BTW: I use mmc card to store rootfs and test it on OMAP3 based beagle-xm board. 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