From: Theodore Ts'o Subject: Re: ext4: journal has aborted Date: Mon, 7 Jul 2014 18:56:19 -0400 Message-ID: <20140707225619.GD8254@thunk.org> References: <20140703161551.5fd13245@archvile> <87tx6yzdxz.fsf@openvz.org> <20140704114031.2915161a@archvile> <87r421zavi.fsf@openvz.org> <20140704132802.0d43b1fc@archvile> <20140704122022.GC10514@thunk.org> <20140704154559.026331ec@archvile> <20140704184539.GA11103@thunk.org> <20140707141701.2f9529af@archvile> <20140707155310.GB8254@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Dmitry Monakhov , Matteo Croce , "Darrick J. Wong" , linux-ext4@vger.kernel.org, Eric Whitney To: David Jander Return-path: Received: from imap.thunk.org ([74.207.234.97]:49827 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750976AbaGGW4Z (ORCPT ); Mon, 7 Jul 2014 18:56:25 -0400 Content-Disposition: inline In-Reply-To: <20140707155310.GB8254@thunk.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, Jul 07, 2014 at 11:53:10AM -0400, Theodore Ts'o wrote: > An update from today's ext4 concall. Eric Whitney can fairly reliably > reproduce this on his Panda board with 3.15, and definitely not on > 3.14. So at this point there seems to be at least some kind of 3.15 > regression going on here, regardless of whether it's in the eMMC > driver or the ext4 code. (It also means that the bug fix I found is > irrelevant for the purposes of working this issue, since that's a much > harder to hit, and that bug has been around long before 3.14.) > > The problem in terms of narrowing it down any further is that the > Pandaboard is running into RCU bugs which makes it hard to test the > early 3.15-rcX kernels..... In the hopes of making it easy to bisect, I've created a kernel branch which starts with 3.14, and then adds on all of the ext4-related commits since then. You can find it at: git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git test-mb_generate_buddy-failure https://git.kernel.org/cgit/linux/kernel/git/tytso/ext4.git/log/?h=test-mb_generate_buddy-failure Eric, can you see if you can repro the failure on your Panda Board? If you can, try doing a bisection search on these series: git bisect start git bisect good v3.14 git bisect bad test-mb_generate_buddy-failure Hopefully if it is caused by one of the commits in this series, we'll be able to pin point it this way. Thanks!! - Ted