Guest seems to be unresponsive. Last heartbeat received 4 seconds ago

virtualhuman · Post by **virtualhuman** » 14. Feb 2026, 17:46

I've got 20+ VMs using various AlmaLinux, Rocky, Fedora and Oracle Linux distros.

They randomly freeze and become unresponsive

All I see is the following in the logs:

02:36:54.792761 VMMDev: vmmDevHeartbeatFlatlinedTimer: Guest seems to be unresponsive. Last heartbeat received 4 seconds ago

Is there anything I can do about this situation?

Thank you.

PS:
I also have some Windows 11 VMs. Another interesting bug, the Windows 11 VMs only boot if they are started before the Linux VMs. If I start any of the Linux VMs first, then none of the Windows 11 VMs boot... weird.