From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53017) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1am2Q4-00030e-TM for qemu-devel@nongnu.org; Fri, 01 Apr 2016 12:59:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1am2Pz-0003Tg-Tf for qemu-devel@nongnu.org; Fri, 01 Apr 2016 12:59:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39421) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1am2Pz-0003TN-O7 for qemu-devel@nongnu.org; Fri, 01 Apr 2016 12:59:31 -0400 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 552D1B5394 for ; Fri, 1 Apr 2016 16:59:30 +0000 (UTC) References: <20160331190307.GA3405@work-vm> <20160401100623.GE2242@work-vm> <20160401155457.GI2242@work-vm> From: Marcel Apfelbaum Message-ID: <56FEA8EC.4000601@redhat.com> Date: Fri, 1 Apr 2016 19:59:24 +0300 MIME-Version: 1.0 In-Reply-To: <20160401155457.GI2242@work-vm> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] q35 migration broken List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Dr. David Alan Gilbert" , jsnow@redhat.com, qemu-devel@nongnu.org On 04/01/2016 06:54 PM, Dr. David Alan Gilbert wrote: > * Dr. David Alan Gilbert (dgilbert@redhat.com) wrote: >> * Dr. David Alan Gilbert (dgilbert@redhat.com) wrote: >>> Hi, >>> I'm seeing a breakage on q35 migration on head (and possibly older >>> but certainly head; it's also on a 2.5.0 world I've got with a bunch >>> of patches but I've not tried a clean 2.5.0 yet). >>> >>> It looks like some type of interrupt screwup; with a virtio-net device >>> I get a: >>> BUG: soft lockup - CPU#0 stuck for 22s! >>> ... virtnet_config_changed_work >>> >>> but if I swap that out for an e1000 I get: >>> Disabling IRQ #22 >>> >>> and various timeouts on e1000 and cdrom (scsi). >>> The guest kind of limps along with an existing terminal scrolling dmesg -w output. >>> >>> This is an f23 guest on a rhel7.2-ish host; with the guest sitting an idle >>> (MATE) Gui. >> >> Also broken with 2.4.1 and 2.5.1 (with pc-q35-2.4 machine type); >> see a screen shot attached; note: >> a) The large count on irq 22 (enp2s1) on cpu1 >> b) The large count on virtio2-config on cpu1 >> c) The count of 'Deferred Error APIC interrupts'. > > OK, this seems to be the i82801b11-bridge; if I remove it from the config > it all works. > > My minimum config that fails so far is: > /opt/qemu-head/bin/qemu-system-x86_64 -nographic -machine pc-q35-2.6,accel=kvm,usb=off,vmport=off -cpu SandyBridge -m 4096 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 \ > -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \ > -drive id=image,file=/home/vms/f23-serial.qcow2,if=none,cache=none \ > -device virtio-blk-pci,scsi=off,bus=pci.1,addr=0x5,drive=image,id=virtio-disk0,bootindex=1 \ > $* > > if I flip the i82801b11-bridge for a pci-bridge then it works. Hi Dave, That's good news. I see we don't have a vmstate for this bridge, but we do have one for the regular pci-bridge. Maybe this is the problem? Thanks, Marcel > > Dave > > -- > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK >