Not able to create the snapshot of dpdk based instance

Issue

• Not able to create the snapshot of dpdk based instance.
• Snapshot command on dpdk based instance didn't throw any error on terminal but snapshot is not created.
• Snapshot of dpdk based instance is getting failed with following call trace in compute node /var/log/nova/nova-compute.log log file

2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server [req-f815e4d0-1555-459d-9e33-6a591e003e6a fb779c2a36a34a95b04571ecad682431 b08633e159af4c8c8757fb31e7ed41e4 - - -] Exception during message handling
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 150, in dispatch
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 121, in _do_dispatch
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 75, in wrapped
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     self.force_reraise()
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 66, in wrapped
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 188, in decorated_function
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     LOG.warning(msg, e, instance=instance)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     self.force_reraise()
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 157, in decorated_function
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 216, in decorated_function
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     self.force_reraise()
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 204, in decorated_function
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 242, in decorated_function
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     instance=instance)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     self.force_reraise()
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 232, in decorated_function
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     *args, **kwargs)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 3038, in snapshot_instance
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     task_states.IMAGE_SNAPSHOT)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 3068, in _snapshot_instance
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     update_task_state)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1470, in snapshot
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     instance)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1563, in _prepare_domain_for_snapshot
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     self.suspend(context, instance)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2445, in suspend
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     guest.save_memory_state()
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line 425, in save_memory_state
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     self._domain.managedSave(0)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in doit
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     result = proxy_call(self._autowrap, f, *args, **kwargs)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in proxy_call
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     rv = execute(f, *args, **kwargs)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in execute
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     six.reraise(c, e, tb)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in tworker
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     rv = meth(*args, **kwargs)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1417, in managedSave
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server     if ret == -1: raise libvirtError ('virDomainManagedSave() failed', dom=self)
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server libvirtError: internal error: unable to execute QEMU command 'migrate': Migration disabled: vhost-user backend lacks VHOST_USER_PROTOCOL_F_LOG_SHMFD feature.
2017-03-28 08:53:34.075 49980 ERROR oslo_messaging.rpc.server