Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752129Ab3JJE23 (ORCPT ); Thu, 10 Oct 2013 00:28:29 -0400 Received: from ipmail07.adl2.internode.on.net ([150.101.137.131]:23590 "EHLO ipmail07.adl2.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751543Ab3JJE21 (ORCPT ); Thu, 10 Oct 2013 00:28:27 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AggIADMsVlJ5LFuj/2dsb2JhbABZgweDSrkZhT+BHRd0giUBAQU6HCMQCAMYCSUPBSUDIROIBblNFo8vB4MfgQQDlCaDXJICgWaBUig Date: Thu, 10 Oct 2013 15:28:20 +1100 From: Dave Chinner To: Fengguang Wu Cc: Dave Chinner , linux-fsdevel@vger.kernel.org, Ben Myers , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, "ocfs2-devel@oss.oracle.com" Subject: Re: [XFS on bad superblock] BUG: unable to handle kernel NULL pointer dereference at 00000003 Message-ID: <20131010042820.GA5663@dastard> References: <20131009073910.GA387@localhost> <20131010005900.GE2025@devil.localdomain> <20131010011640.GA5726@localhost> <20131010014117.GA6017@localhost> <20131010031515.GT4446@dastard> <20131010032637.GA12725@localhost> <20131010033300.GA12952@localhost> <20131010033834.GA13141@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131010033834.GA13141@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1768 Lines: 57 On Thu, Oct 10, 2013 at 11:38:34AM +0800, Fengguang Wu wrote: > On Thu, Oct 10, 2013 at 11:33:00AM +0800, Fengguang Wu wrote: > > On Thu, Oct 10, 2013 at 11:26:37AM +0800, Fengguang Wu wrote: > > > Dave, > > > > > > > I note that you have CONFIG_SLUB=y, which means that the cache slabs > > > > are shared with objects of other types. That means that the memory > > > > corruption problem is likely to be caused by one of the other > > > > filesystems that is probing the block device(s), not XFS. > > > > > > Good to know that, it would easy to test then: just turn off every > > > other filesystems. I'll try it right away. > > > > Seems that we don't even need to do that. A dig through the oops > > database and I find stack dumps from other FS. > > > > This happens in the kernel with same kconfig and commit 3.12-rc1. > > Here is a summary of all FS with oops: > > 411 ocfs2_fill_super > 189 xfs_fs_fill_super > 86 jfs_fill_super > 50 isofs_fill_super > 33 fat_fill_super > 18 vfat_fill_super > 15 msdos_fill_super > 11 ext2_fill_super > 10 ext3_fill_super > 3 reiserfs_fill_super The order of probing on the original dmesg output you reported is: ext3 ext2 fatfs reiserfs gfs2 isofs ocfs2 which means that no XFS filesystem was mounted in the original bug report, and hence that further indicates that XFS is not responsible for the problem and that perhaps the original bisect was not reliable... Cheers, Dave. -- Dave Chinner david@fromorbit.com -- 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/