Fedora coreos VM freezes after a few hours

Incus
1

Hi,

anyone experiencing random freezes with fedora coreos in an Incus VM running on an Incus OS host?

When installing fedorea coreos as a VM I get kenel panics and freezes after a few hours. It is independent of the Incus host, it happens on multiple different incus hotsts and different fedora kernels of the VMs (6.17.12 and 6.18.5). Even if it is just a plain installation without load. It makes no difference if qemu-guest-tools or incus agent is installed or not. VMs with debian or windows based VMs on the same host systems run without any problems.

sudo journalctl -xb inside the VM delivers:

x86 CPU feature dependency check failure: CPU0 has '18*32+31' enabled but '18*32+26' disabled.
[Firmware Bug]: TSC doesn't count with P0 frequency!

Unfortunately kdump does not log anything, the VM completely crashes / freezes.

Any ideas what could cause the crashes? Or any incus paramters I could try?

2

Looks like I am a step further to a solution:

Changing the cpu type in the config of the VM from host to qemu64 or EPYC-v4 seems to make things stable:

  raw.qemu: |
    -cpu EPYC-v4

Did not have a single crash since then.