From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934150Ab3CMTBq (ORCPT ); Wed, 13 Mar 2013 15:01:46 -0400 Received: from li9-11.members.linode.com ([67.18.176.11]:53193 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933043Ab3CMTBp (ORCPT ); Wed, 13 Mar 2013 15:01:45 -0400 Date: Wed, 13 Mar 2013 15:01:41 -0400 From: "Theodore Ts'o" To: Josh Triplett Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Andreas Dilger Subject: Re: NULL pointer dereference in ext4_superblock_csum_set with mounted filesystem Message-ID: <20130313190141.GF5604@thunk.org> Mail-Followup-To: Theodore Ts'o , Josh Triplett , linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Andreas Dilger References: <20130313185911.GA1446@jtriplet-mobl1> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130313185911.GA1446@jtriplet-mobl1> User-Agent: Mutt/1.5.21 (2010-09-15) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 13, 2013 at 11:59:13AM -0700, Josh Triplett wrote: > I frequently test kernel changes by booting them with kvm's -kernel > option, with -hda pointing to my host system's root filesystem, and > -snapshot to prevent writing to (and likely corrupting) that root > filesystem. I tried this with a kernel built from git commit > 7c6baa304b841673d3a55ea4fcf9a5cbf7a1674b, with a stock x86-64 "make > defconfig", and got a kernel panic: Can you send me the output of "dumpe2fs -h" on your host system's root file system? Thanks, - Ted