[ovirt-devel] OST Failure: libvirtError: COMMAND_FAILED: INVALID_IPV: 'ipv6' is not a valid backend or is unavailable

Hi, One of the OST suite (hc-basic-suite-4.3) is failing with error: libvirtError: COMMAND_FAILED: INVALID_IPV: 'ipv6' is not a valid backend or is unavailable Full log: * Create network lago-hc-basic-suite-4-3-net-management: ERROR (in 0:00:11)*07:42:57* # Start nets: ERROR (in 0:00:11)*07:42:57* @ Start Prefix: ERROR (in 0:00:11)*07:42:57* Error occured, aborting*07:42:57* Traceback (most recent call last):*07:42:57* File "/usr/lib/python2.7/site-packages/lago/cmd.py", line 969, in main*07:42:57* cli_plugins[args.verb].do_run(args)*07:42:57* File "/usr/lib/python2.7/site-packages/lago/plugins/cli.py", line 184, in do_run*07:42:57* self._do_run(**vars(args))*07:42:57* File "/usr/lib/python2.7/site-packages/lago/utils.py", line 573, in wrapper*07:42:57* return func(*args, **kwargs)*07:42:57* File "/usr/lib/python2.7/site-packages/lago/utils.py", line 584, in wrapper*07:42:57* return func(*args, prefix=prefix, **kwargs)*07:42:57* File "/usr/lib/python2.7/site-packages/lago/cmd.py", line 271, in do_start*07:42:57* prefix.start(vm_names=vm_names)*07:42:57* File "/usr/lib/python2.7/site-packages/lago/sdk_utils.py", line 50, in wrapped*07:42:57* return func(*args, **kwargs)*07:42:57* File "/usr/lib/python2.7/site-packages/lago/prefix.py", line 1323, in start*07:42:57* self.virt_env.start(vm_names=vm_names)*07:42:57* File "/usr/lib/python2.7/site-packages/lago/virt.py", line 341, in start*07:42:57* net.start()*07:42:57* File "/usr/lib/python2.7/site-packages/lago/providers/libvirt/network.py", line 115, in start*07:42:57* net = self.libvirt_con.networkCreateXML(self._libvirt_xml())*07:42:57* File "/usr/lib64/python2.7/site-packages/libvirt.py", line 4216, in networkCreateXML*07:42:57* if ret is None:raise libvirtError('virNetworkCreateXML() failed', conn=self)*07:42:57* libvirtError: COMMAND_FAILED: INVALID_IPV: 'ipv6' is not a valid backend or is unavailable*07:42:57* + on_exit Any one has idea what could be the issue? -- Thanks, Gobinda