From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Richard W.M. Jones" Subject: Re: Latest kernel NULL pointer deref when running mke2fs Date: Sun, 9 Feb 2014 18:47:32 +0000 Message-ID: <20140209184732.GB7373@redhat.com> References: <20140204160910.GA7373@redhat.com> <52F11D9E.9020601@fb.com> <20140204173155.GV1346@redhat.com> <52F12817.1040003@fb.com> <20140205122120.GW1346@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Linux FS Devel , axboe@fb.com, kmo@daterainc.com, neilb@suse.de To: Chris Mason Return-path: Received: from mx1.redhat.com ([209.132.183.28]:20863 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751523AbaBISrm (ORCPT ); Sun, 9 Feb 2014 13:47:42 -0500 Content-Disposition: inline In-Reply-To: <20140205122120.GW1346@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Wed, Feb 05, 2014 at 12:21:20PM +0000, Richard W.M. Jones wrote: > On Tue 04 Feb 2014 12:31:56 PM EST, Richard W.M. Jones wrote: > >https://lkml.org/lkml/2014/2/4/107 > > Sorry about the delay. I ran into a different kernel bug which > needed fixing first. > > The patch above *does not* fix this issue. To follow up here, it's actually an MD problem. The following userspace commands are enough to trigger the NULL pointer deref: mdadm --create --run test --level raid1 --raid-devices 2 /dev/sda1 /dev/sdb1 wipefs -a --force /dev/md/test mke2fs -t ext4 -F /dev/md/test There's a full log attached to this comment: https://bugzilla.redhat.com/show_bug.cgi?id=1061339#c8 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#)