From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54565) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFhDi-0002qF-O5 for qemu-devel@nongnu.org; Thu, 16 Jul 2015 07:20:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZFhDd-0004Ma-CE for qemu-devel@nongnu.org; Thu, 16 Jul 2015 07:20:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42861) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFhDd-0004MS-0a for qemu-devel@nongnu.org; Thu, 16 Jul 2015 07:20:49 -0400 References: <556DBF87.2020908@de.ibm.com> <20150609022832.GA12817@cpc-pc.redhat.com> <5576AB52.8090708@de.ibm.com> <20150610021224.GE10873@ad.nay.redhat.com> <557800E0.5020202@de.ibm.com> <20150610093408.GC11648@ad.nay.redhat.com> <55A78F87.9030805@de.ibm.com> From: Paolo Bonzini Message-ID: <55A7938A.8000101@redhat.com> Date: Thu, 16 Jul 2015 13:20:42 +0200 MIME-Version: 1.0 In-Reply-To: <55A78F87.9030805@de.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] "iothread: release iothread around aio_poll" causes random hangs at startup List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Christian Borntraeger , Fam Zheng Cc: Kevin Wolf , qemu-devel , Stefan Hajnoczi On 16/07/2015 13:03, Christian Borntraeger wrote: > For what its worth, I can no longer reproduce the issue on > current master + cherry-pick of a0710f7995f (iothread: release iothread around aio_poll) > > bisect tells me that > > commit 53ec73e264f481b79b52efcadc9ceb8f8996975c > Author: Fam Zheng > AuthorDate: Fri May 29 18:53:14 2015 +0800 > Commit: Stefan Hajnoczi > CommitDate: Tue Jul 7 14:27:14 2015 +0100 > > block: Use bdrv_drain to replace uncessary bdrv_drain_all > > made the problem will blk-null go away. I still dont understand why. It could be related to the AioContext problem that I'm fixing these days, too. Good news, we'll requeue the patch for 2.5. Paolo