[libvirt] an old bug reappear-TimeoutError

hi, i encounter an error of libvirt, which is reported in 2011. i intended to update the ticket(spice password) of vm. https://bugzilla.redhat.com/show_bug.cgi?id=676205 ---------log------------------ Thread-162::ERROR::2013-05-08 13:50:46,000::BindingXMLRPC::909::vdsm::(wrapper) libvirt error Traceback (most recent call last): File "/usr/share/vdsm/BindingXMLRPC.py", line 904, in wrapper res = f(*args, **kwargs) File "/usr/share/vdsm/BindingXMLRPC.py", line 213, in vmSetTicket return vm.setTicket(password, ttl, existingConnAction, params) File "/usr/share/vdsm/API.py", line 550, in setTicket return v.setTicket(password, ttl, existingConnAction, params) File "/usr/share/vdsm/libvirtvm.py", line 2245, in setTicket self._dom.updateDeviceFlags(graphics.toxml(), 0) File "/usr/share/vdsm/libvirtvm.py", line 524, in f raise toe TimeoutError: Timed out during operation: cannot acquire state change lock