From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59383) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFhTX-0001Ge-RE for qemu-devel@nongnu.org; Thu, 16 Jul 2015 07:37:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZFhTS-0003Il-KC for qemu-devel@nongnu.org; Thu, 16 Jul 2015 07:37:15 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34138) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZFhTS-0003Hz-EU for qemu-devel@nongnu.org; Thu, 16 Jul 2015 07:37:10 -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> <55A7938A.8000101@redhat.com> <55A79463.5070704@de.ibm.com> From: Paolo Bonzini Message-ID: <55A79760.8060202@redhat.com> Date: Thu, 16 Jul 2015 13:37:04 +0200 MIME-Version: 1.0 In-Reply-To: <55A79463.5070704@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 13:24, Christian Borntraeger wrote: > The interesting part is that this problem required 2 or more disk > (and we replace drain_all with single drains) so it somewhat sounds > plausible. Yes, indeed. It is very plausible. I wanted to reproduce it these days, so thanks for saving me a lot of time! I'll test your exact setup (master + AioContext fix + cherry-pick of a0710f7995f + revert of 53ec73e26). Thanks, Paolo