From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60376) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ai0BN-00026H-TG for qemu-devel@nongnu.org; Mon, 21 Mar 2016 09:47:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ai0BL-0003Dc-KQ for qemu-devel@nongnu.org; Mon, 21 Mar 2016 09:47:45 -0400 Received: from e37.co.us.ibm.com ([32.97.110.158]:56509) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ai0BL-0003CH-Cd for qemu-devel@nongnu.org; Mon, 21 Mar 2016 09:47:43 -0400 Received: from localhost by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 21 Mar 2016 07:47:38 -0600 References: <1458123018-18651-1-git-send-email-famz@redhat.com> <56E9355A.5070700@redhat.com> <56E93A22.1080102@de.ibm.com> <56E93ECE.10103@redhat.com> <56E9425C.8030201@de.ibm.com> <56E957AD.2050005@redhat.com> <56E961EA.4090908@de.ibm.com> <56EAA170.1000904@linux.vnet.ibm.com> <56EAA576.8020709@de.ibm.com> <56EAC706.2040006@redhat.com> <56EACA22.2020505@de.ibm.com> <56EACA64.9060402@de.ibm.com> <56EAD69B.10107@de.ibm.com> <56EC18A7.6070709@redhat.com> From: TU BO Message-ID: <56EFFB70.5050801@linux.vnet.ibm.com> Date: Mon, 21 Mar 2016 21:47:28 +0800 MIME-Version: 1.0 In-Reply-To: <56EC18A7.6070709@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini , Christian Borntraeger , Fam Zheng , qemu-devel@nongnu.org Cc: Kevin Wolf , cornelia.huck@de.ibm.com, qemu-block@nongnu.org, Stefan Hajnoczi , "Michael S. Tsirkin" On 16/3/18 下午11:03, Paolo Bonzini wrote: > > On 17/03/2016 17:08, Christian Borntraeger wrote: >> Good (or bad?) news is the assert also triggers on F23, it just seems >> to take longer. > I guess good news, because we can rule out the kernel (not that I > believed it was a kernel problem, but the thought is always there in > the background...). > > The interaction between ioeventfd and dataplane is too complicated. I > think if we get rid of the start/stop ioeventfd calls (just set up the > ioeventfd as soon as possible and then only set/clear the handlers) > things would be much simpler. > > I'll see if I can produce something based on Conny's patches, which are > already a start. Today I had a short day so I couldn't play with the > bug; out of curiosity, does the bug reproduce with her work + patch 4 > from this series + the reentrancy assertion? I did NOT see crash with qemu master + "[PATCH RFC 0/6] virtio: refactor host notifiers" from Conny + patch 4 + assertion. thx > > Paolo >