From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.profihost.ag ([85.158.179.208]:39452 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751587Ab2FYRim (ORCPT ); Mon, 25 Jun 2012 13:38:42 -0400 Message-ID: <4FE8A21E.7050104@profihost.ag> Date: Mon, 25 Jun 2012 19:38:38 +0200 From: Stefan Priebe MIME-Version: 1.0 To: Josef Bacik CC: "linux-btrfs@vger.kernel.org" Subject: Re: btrfs deadlock in 3.5-rc3 References: <4FE58366.8000302@profihost.ag> <4FE862D7.3060005@fusionio.com> <4FE870DF.90308@profihost.ag> <20120625142048.GB7404@localhost.localdomain> <4FE8796E.9030300@profihost.ag> <20120625144807.GC7404@localhost.localdomain> In-Reply-To: <20120625144807.GC7404@localhost.localdomain> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Am 25.06.2012 16:48, schrieb Josef Bacik: > On Mon, Jun 25, 2012 at 08:45:02AM -0600, Stefan Priebe - Profihost AG wrote: >>> >>> Thats weird, sysrq+w should have a bunch of stacktraces but it's empty, so >>> unless theres a bug theres nothing blocked. Is the box actually hung or is it >>> just taking forever? Maybe try sysrq+w again to see if the one you pasted was >>> just a fluke? Thanks, >> >> This one looks better: >> http://pastebin.com/raw.php?i=R4pztDRt >> > > Ok looks like you have discard turned on. Yes > Can you turn that off and see if you > can still reproduce the deadlock? If so sysrq+w again, if not then I know where > to look ;). Thanks, without discard i can't reproduce but random write speed with ceph without discard is a LOT slower (around 8000 iops/s instead of 13000iops/s). So i don't know if it is discard or if i'm just not able to trigger it. Thanks! Stefan