From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39098) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WiQm9-0006hv-F6 for qemu-devel@nongnu.org; Thu, 08 May 2014 12:02:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WiQm3-00043s-9h for qemu-devel@nongnu.org; Thu, 08 May 2014 12:02:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:62221) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WiQm3-00043n-2U for qemu-devel@nongnu.org; Thu, 08 May 2014 12:02:19 -0400 Message-ID: <536BAA86.2090109@redhat.com> Date: Thu, 08 May 2014 18:02:14 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <53693FA4.3000306@windriver.com> <5369D504.2070101@redhat.com> <536AB2EE.6010504@windriver.com> <20140508130231.GA24978@grmbl.mre> <536B8332.9070705@redhat.com> <20140508133052.GA25602@grmbl.mre> <536B9524.8070307@windriver.com> <536B95E3.3010808@redhat.com> <536BA95C.8070306@windriver.com> In-Reply-To: <536BA95C.8070306@windriver.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] virtio-serial-pci very expensive during live migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Chris Friesen , Amit Shah Cc: qemu-devel@nongnu.org, armbru@redhat.com Il 08/05/2014 17:57, Chris Friesen ha scritto: >>> >>> The fact remains that qemu crashes when I apply the patch. I also tried >>> patching it as below in virtio_pci_vmstate_change(). That would allow >>> the VM to boot, but it would crash when I tried to do a live migration. >> >> Can you give us your command line and a backtrace? > > For the backtrace, you mean with a core file? Or is there a better way? You can attach gdb to the qemu process, and run "thread apply all bt" when QEMU crashes. Paolo