KVM freezes after live migration (AMD 4184 -> 4234)

[Kilian Ries]

Hi,

i have two host systems with different CPU types:

Host A:
AMD Opteron(tm) Processor 4234

Host B:
AMD Opteron(tm) Processor 4184

Live migration from B -> A works as expected, migration from A -> B always ends in a freezed KVM. If the KVM is frozen, VNC output is still present, however, you can't type anything. CPU usage is always at 100% for one core (so if i set two cores, one is at 100% the other one at 0% usage).

My command to launch the KVM is the following:

/usr/bin/kvm -id 104 -chardev socket,id=qmp,path=/var/run/qemu-server/104.qmp,server,nowait -mon chardev=qmp,mode=control -pidfile /var/run/qemu-server/104.pid -daemonize -smbios type=1,uuid=26dd83a9-b9bd-4641-8016-c55f255f1bdf -name kilian-test -smp 1,sockets=1,cores=1,maxcpus=1 -nodefaults -boot menu=on,strict=on,reboot-timeout=1000 -vga cirrus -vnc unix:/var/run/qemu-server/104.vnc,x509,password -cpu kvm64,+lahf_lm,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,enforce -m 512 -object memory-backend-ram,id=ram-node0,size=512M -numa node,nodeid=0,cpus=0,memdev=ram-node0 -k de -device pci-bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f -device pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e -device piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device usb-tablet,id=tablet,bus=uhci.0,port=1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi initiator-name=iqn.1993-08.org.debian:01:5ca1e9d334b2 -drive file=/mnt/pve/nfs_synology/images/104/vm-104-disk-2.qcow2,if=none,id=drive-virtio0,format=qcow2,cache=none,aio=native,detect-zeroes=on -device virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100 -netdev type=tap,id=net0,ifname=tap104i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on -device virtio-net-pci,mac=66:33:31:36:35:36,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300

KVM / QEMU version: QEMU emulator version 2.5.1.1

I have tried to set different CPU types, but no one works (qemu64, vm64, Opteron_G1, ...).

I have found an email from 2014 where another user reports exactly the same problem:

http://lists.gnu.org/archive/html/qemu-discuss/2014-02/msg00002.html

Greets
Kilian

[Kilian Ries (7-mair-g)]

Found another post from a user in the proxmox forum which has a similar problem (only difference are the CPUs in use):

https://forum.proxmox.com/threads/vm-freezeing-with-vcpu-at-100-when-doing-livemigration.25987/

[Thomas Huth (th-huth)]

Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays?

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]