From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josh Durgin Subject: Re: Latest bobtail branch still crashing KVM VMs in bh_write_commit() Date: Fri, 22 Mar 2013 10:11:32 -0700 Message-ID: <514C90C4.3050703@inktank.com> References: <514A13A8.7010002@profihost.ag> <514A189E.7070802@profihost.ag> <514A19D7.1040309@inktank.com> <514A1CF9.5040807@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-da0-f47.google.com ([209.85.210.47]:38138 "EHLO mail-da0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161033Ab3CVRLZ (ORCPT ); Fri, 22 Mar 2013 13:11:25 -0400 Received: by mail-da0-f47.google.com with SMTP id s35so2365879dak.6 for ; Fri, 22 Mar 2013 10:11:25 -0700 (PDT) In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Travis Rhoden Cc: Stefan Priebe , bcampbell@axcess-financial.com, ceph-devel I think I found the root cause based on your logs: http://tracker.ceph.com/issues/4531 Josh On 03/20/2013 02:47 PM, Travis Rhoden wrote: > Didn't take long to re-create with the detailed debugging (ms = 20). > I'm sending Josh a link to the gzip'd log off-list, I"m not sure if > the log will contain any CephX keys or anything like that. > > On Wed, Mar 20, 2013 at 4:39 PM, Travis Rhoden wrote: >> Thanks Josh. I will respond when I have something useful! >> >> On Wed, Mar 20, 2013 at 4:32 PM, Josh Durgin wrote: >>> On 03/20/2013 01:19 PM, Josh Durgin wrote: >>>> >>>> On 03/20/2013 01:14 PM, Stefan Priebe wrote: >>>>> >>>>> Hi, >>>>> >>>>>> In this case, they are format 2. And they are from cloned snapshots. >>>>>> Exactly like the following: >>>>>> >>>>>> # rbd ls -l -p volumes >>>>>> NAME SIZE >>>>>> PARENT FMT PROT LOCK >>>>>> volume-099a6d74-05bd-4f00-a12e-009d60629aa8 5120M >>>>>> images/b8bdda90-664b-4906-86d6-dd33735441f2@snap 2 >>>>>> >>>>>> I'm doing an OpenStack boot-from-volume setup. >>>>> >>>>> >>>>> OK i've never used cloned snapshots so maybe this is the reason. >>>>> >>>>>>> strange i've never seen this. Which qemu version? >>>>>> >>>>>> >>>>>> # qemu-x86_64 -version >>>>>> qemu-x86_64 version 1.0 (qemu-kvm-1.0), Copyright (c) 2003-2008 >>>>>> Fabrice Bellard >>>>>> >>>>>> that's coming from Ubuntu 12.04 apt repos. >>>>> >>>>> >>>>> maybe you should try qemu 1.4 there are a LOT of bugfixes. qemu-kvm does >>>>> not exist anymore it was merged into qemu with 1.3 or 1.4. >>>> >>>> >>>> This particular problem won't be solved by upgrading qemu. It's a ceph >>>> bug. Disabling caching would work around the issue. >>>> >>>> Travis, could you get a log from qemu of this happening with: >>>> >>>> debug ms = 20 >>>> debug objectcacher = 20 >>>> debug rbd = 20 >>>> log file = /path/writeable/by/qemu >>> >>> >>> If it doesn't reproduce with those settings, try changing debug ms to 1 >>> instead of 20. >>> >>> >>>> From those we can tell whether the issue is on the client side at least, >>>> and hopefully what's causing it. >>>> >>>> Thanks! >>>> Josh >>> >>> > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >