This is almost certainly the kernel bug mentioned in that Fedora BZ. There is however a workaround added in libvirt now for distros/users who can't fix their kernel https://www.redhat.com/archives/libvir- list/2017-September/msg00519.html
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1722702 Title: libvirt - vnc port selection regression with newer kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1722702/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs