From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753065AbcHQUCn (ORCPT ); Wed, 17 Aug 2016 16:02:43 -0400 Received: from mail.sig21.net ([80.244.240.74]:33244 "EHLO mail.sig21.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752406AbcHQUCm (ORCPT ); Wed, 17 Aug 2016 16:02:42 -0400 Date: Wed, 17 Aug 2016 22:02:32 +0200 From: Johannes Stezenbach To: "Darrick J. Wong" Cc: =?iso-8859-1?B?VPZy9ms=?= Edwin , linux-kernel@vger.kernel.org, tytso@mit.edu, linux-ext4@vger.kernel.org Subject: Re: 4.7.0-rc7 ext4 error in dx_probe Message-ID: <20160817200232.cd5ehiwbwbnggddo@sig21.net> References: <20160718141723.GA8809@sig21.net> <7849bcd2-142d-0a12-0a04-7d0c3b6d788f@etorok.net> <20160805103544.kbt7znbzypvi5ofx@sig21.net> <20160805170228.GA19960@birch.djwong.org> <20160805181136.mcjnnvuo5m6kpxzb@sig21.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160805181136.mcjnnvuo5m6kpxzb@sig21.net> User-Agent: Mutt/1.6.2-neo (2016-07-23) X-Spam-21-Score: -2.9 (--) X-Spam-21-Report: No, score=-2.9 required=8.0 tests=ALL_TRUSTED=-1,BAYES_00=-1.9 autolearn=ham autolearn_force=no Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 05, 2016 at 08:11:36PM +0200, Johannes Stezenbach wrote: > On Fri, Aug 05, 2016 at 10:02:28AM -0700, Darrick J. Wong wrote: > > > > When you're back on 4.7, can you apply this patch[1] to see if it fixes > > the problem? I speculate that the new parallel dir lookup code enables > > multiple threads to be verifying the same directory block buffer at the > > same time. > > > > [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/fs/ext4/inode.c?id=b47820edd1634dc1208f9212b7ecfb4230610a23 > > I added the patch, rebuilt and rebooted. It will take some time > before I'll report back since the issue is so hard to reproduce. FWIW, so far the issue didn't appear again after I applied the patch to 4.7.0, and I stressed it a bit with repo syncs, AOSP builds, rsync backups etc. Johannes