Also, after migration, the VM completely froze. I also tried to disable TSC completely for the guest, making it relying on HPET, which makes the VM really laggy and throws warnings about stuck IRQ events on the console, sometimes even a kernel panic caused by the NMI watchdog.
I stumbled across this report and tried to set a fixed TSC frequency for the guest (with different values), but no success so far. Qemu-system-x86_64: warning: TSC frequency mismatch between VM (2600083 kHz) and host (3207181 kHz), and TSC scaling unavailable The machine freezes and doesn't show any reaction to keyboard input (via VNC).Īlso, the following is logged on the target host: This seems to be a timing or interrupt related problem. Just a Live CD device via a virtual IDE controller. Virtual machines are configured to use a "SandyBridge" CPU model, as how it worked before with the older Ubuntu version.Īlso, my test guest has no hard drive, no audio device, no networking. Migration does not work, when migrating from 1->3 or 1->4, but still works in the opposite direction. I have multiple servers, but I just pick four of them to better compare: On 18.04 there were no problems with live-migration - this only started to happen on 22.04. Previously the servers ran on Ubuntu 18.04 and were reinstalled recently.
Tested guests were HVM machines running current Ubuntu or CentOS/Rocky Linux. When migrating VMs between some of these servers, the VM immediately freezes on the target system.
I have several servers (different ages) running on Ubuntu 22.04 with QEMU and libvirt.
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