From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: reproducable osd crash Date: Thu, 21 Jun 2012 15:07:34 +0200 Message-ID: <4FE31C96.6050901@profihost.ag> References: <4FE319DF.3020106@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail.profihost.ag ([85.158.179.208]:37760 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759567Ab2FUNHh (ORCPT ); Thu, 21 Jun 2012 09:07:37 -0400 In-Reply-To: <4FE319DF.3020106@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: "ceph-devel@vger.kernel.org" When i start now the OSD again it seems to hang for forever. Load goes=20 up to 200 and I/O Waits rise vom 0% to 20%. Am 21.06.2012 14:55, schrieb Stefan Priebe - Profihost AG: > Hello list, > > i'm able to reproducably crash osd daemons. > > How i can reproduce: > > Kernel: 3.5.0-rc3 > Ceph: 0.47.3 > FS: btrfs > Journal: 2GB tmpfs per OSD > OSD: 3x servers with 4x Intel SSD OSDs each > 10GBE Network > rbd_cache_max_age: 2.0 > rbd_cache_size: 33554432 > > Disk is set to writeback. > > Start a KVM VM via PXE with the disk attached in writeback mode. > > Then run randwrite stress more than 2 time. Mostly OSD 22 in my case > crashes. > > # fio --filename=3D/dev/vda1 --direct=3D1 --rw=3Drandwrite --bs=3D4k = --size=3D200G > --numjobs=3D50 --runtime=3D90 --group_reporting --name=3Dfile1; fio > --filename=3D/dev/vda1 --direct=3D1 --rw=3Drandwrite --bs=3D4k --size= =3D200G > --numjobs=3D50 --runtime=3D90 --group_reporting --name=3Dfile1; fio > --filename=3D/dev/vda1 --direct=3D1 --rw=3Drandwrite --bs=3D4k --size= =3D200G > --numjobs=3D50 --runtime=3D90 --group_reporting --name=3Dfile1; halt > > Strangely exactly THIS OSD also has the most log entries: > 64K ceph-osd.20.log > 64K ceph-osd.21.log > 1,3M ceph-osd.22.log > 64K ceph-osd.23.log > > But all OSDs are set to debug osd =3D 20. > > dmesg shows: > ceph-osd[5381]: segfault at 3f592c000 ip 00007fa281d8eb23 sp > 00007fa27702d260 error 4 in libtcmalloc.so.0.0.0[7fa281d6a000+3d000] > > I uploaded the following files: > priebe_fio_randwrite_ceph-osd.21.log.bz2 =3D> OSD which was OK and di= dn't > crash > priebe_fio_randwrite_ceph-osd.22.log.bz2 =3D> Log from the crashed OS= D > =FCu > priebe_fio_randwrite_core.ssdstor001.27204.bz2 =3D> Core dump > priebe_fio_randwrite_ceph-osd.bz2 =3D> osd binary > > Stefan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html