On Wed, Apr 07, 2021 at 08:14:10 +0000, Mathieu Tarral wrote: > 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 This is reported when we fail to set an error message > > I checked /var/log/libvirt/libxl/libxl-driver.log, but the log file is empty. Please try enabling full debug logging, it may at least show what the last thing we were doing is. https://www.libvirt.org/kbase/debuglogs.html#persistent-setting