2013-10-31 22:53:55,624.624 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support connection events: Requested operation is not valid: A close callback is already registered
2013-10-31 22:53:55,626.626 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support events: adding cb to list
2013-10-31 22:53:55,627.627 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support connection events: Requested operation is not valid: A close callback is already registered
2013-10-31 22:53:55,629.629 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support events: adding cb to list
2013-10-31 22:53:55,630.630 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support connection events: Requested operation is not valid: A close callback is already registered
2013-10-31 22:53:55,633.633 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support events: adding cb to list
2013-10-31 22:53:55,634.634 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support connection events: Requested operation is not valid: A close callback is already registered
2013-10-31 22:53:55,636.636 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support events: adding cb to list
2013-10-31 22:53:55,637.637 28874 WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support connection events: Requested operation is not valid: A close callback is already registered
This no longer seems to be a problem, I've checked logs on both ubuntu and fedora and couldn't find these entries.
Closing this bug, please reopen if your still seeing the issue.