Libvirtd running as root tries to access oneadmin NFS mount: error: can't canonicalize path

I’ve checked our setup, the only difference (besides using ubuntu) is NFSv3 instead of NFSv4.
Since you use sec=sys, you could try if that makes a difference.
From the message quoted, it seems access to NFS is not an issue, the problem starts when the disk-image is accessed (disk.1) - is it possible to access/read the disk.1 file as oneadmin from a node over NFS ?