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Xen: libvirt.libvirtError: An error occurred, but the cause is unknown



Hi,

I'm facing a strange issue with libvirt and the Xen driver.

Whenever I try to define or start a domain, I always get this error:
"libvirt.libvirtError: An error occurred, but the cause is unknown" (in Python virt-manager interface)

Which is not very helpful.
Trying to use virsh directly leads to the same error message:

virsh # start win10_xen
error: Failed to start domain win10_xen
error: An error occurred, but the cause is unknown

I checked /var/log/libvirt/libxl/libxl-driver.log, but the log file is empty.

However, using the xl toolstack directly to start a new domain works fine,
so the issue doesn't seem to come from Xen.

My environment:
- Ubuntu 20.04 LTS
- xen-hypervisor-4.11-amd64 (4.11.3+24-g14b62ab3e5-1ubuntu2)
- libvirt0 (6.0.0-0ubuntu8.8)

I really like libvirt and virt-manager to manage my VMs.

Any clue how I could dig deeper and find the root cause ?

Thanks.


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