From: Markus Trippelsdorf Subject: Re: torrent hash failures since 3.9.0-rc1 Date: Tue, 12 Mar 2013 00:12:27 +0100 Message-ID: <20130311231227.GA319@x4> References: <20130311171824.GA434@x4> <20130311191753.GA439@x4> <20130311194159.GB3579@redhat.com> <20130311201334.GA444@x4> <20130311203738.GB15478@thunk.org> <20130311204625.GA433@x4> <20130311211833.GC15478@thunk.org> <20130311213837.GA438@x4> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: Theodore Ts'o , Dave Jones , linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Zheng Liu Return-path: Content-Disposition: inline In-Reply-To: <20130311213837.GA438@x4> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On 2013.03.11 at 22:38 +0100, Markus Trippelsdorf wrote: > On 2013.03.11 at 17:18 -0400, Theodore Ts'o wrote: > > On Mon, Mar 11, 2013 at 09:46:25PM +0100, Markus Trippelsdorf wrote: > > > > BTW, I'm currently running 3.9-rc2 with some additional fixes from the > > > > ext4 dev branch, and I'm not able to reproduce the problem using > > > > rtorrent on my laptop. How reliably is it reproducing for you? Are > > > > you seeing the problem every time you try this? > > > > > > Yes, it's 100% reproducible for me. If I boot a 3.8 kernel the issue > > > vanishes. > > > > Would you be willing to try an experiment? > > > > Try pulling down the master branch from the ext4 git tree here: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git > > > > This contains all of the ext4 changes which are in 3.9-rc1, based on > > top of 3.8-rc3. See if it reproduces there. If it does, then it > > would tend to confirm the hypothesis that the issue was introduced by > > one of the ext4 patches that we merged during the 3.9-rc1 merge > > window... and then, since if you can reproduce the problem, if you > > could do a git bisect to find the guilty commit, that would really > > greatly appreciated. > > > > If you can't reproduce it from the ext4.git tree, then the problem is > > probably caused by some other change that was introduced between 3.8 > > and 3.9-rc1. > > I've started a full bisection from v3.8 to todays git tree. It will take > ~13 steps. However it's already late here in Germany. I will continue > the bisection tomorrow and report back. The issue started with: 74cd15cd02708c7188581f279f33a98b2ae8d322 is the first bad commit commit 74cd15cd02708c7188581f279f33a98b2ae8d322 Author: Zheng Liu Date: Mon Feb 18 00:32:55 2013 -0500 ext4: reclaim extents from extent status tree Please note that my local rtorrent version was configured with "--with-posix-fallocate". I'm not sure if distributions also enable this flag, but it could explain why Ted and Dave weren't able to reproduce the problem so far. -- Markus