From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60256) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b9woS-000628-Vw for qemu-devel@nongnu.org; Mon, 06 Jun 2016 11:51:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b9woO-00008Z-My for qemu-devel@nongnu.org; Mon, 06 Jun 2016 11:51:36 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:46673 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b9woO-00008C-Cc for qemu-devel@nongnu.org; Mon, 06 Jun 2016 11:51:32 -0400 References: <57557B7B.2070301@kamp.de> From: Peter Lieven Message-ID: <57559C00.6010009@kamp.de> Date: Mon, 6 Jun 2016 17:51:28 +0200 MIME-Version: 1.0 In-Reply-To: <57557B7B.2070301@kamp.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Broken live Migration in Qemu 2.5.1.1? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "qemu-devel@nongnu.org" , qemu-stable@nongnu.org Am 06.06.2016 um 15:32 schrieb Peter Lieven: > Hi, > > during internal testing of Qemu 2.5.1.1 I found a vServer running Ubuntu 12.04 (kernel 3.13) and a slave SQL server to > stop replicating from the master. This seems to be reproducible. It is possible to continue replication when issuing a slave stop / slave start. > There is no error visible on the vServer. > > Has anyone a fix in mind that could be related to such an issue? > > Host kernel in Linux 4.4, Guest kernel 3.13. Guest driver is virtio-blk via iSCSI. Emulated vCPU is Westmere. After a lot of testing I found out that obviously thats no block driver problem, but a regression in the virtio-net or the network stack. qemu_announce_self() is generating packets for all NICs, but it seems they are no longer emitted. This worked at least in qemu-2.2.0 with the same guest kernel and host kernel. I will continue debugging tomorrow why this happens. Peter