'lago ovirt stop' fails due to running asynchronous tasks

[gbenhaim]

12:16:15 + cd /dev/shm/ost/deployment-basic-suite-master
12:16:15 + lago ovirt stop
12:16:15 @ Stopping oVirt environment:
12:16:15 # Stopping Engine VMs:
12:16:20 # Stopping Engine VMs: Success (in 0:00:05)
12:16:20 # Putting hosts in maintenance mode:
12:16:21 # Putting hosts in maintenance mode: ERROR (in 0:00:00)
12:16:21 @ Stopping oVirt environment: ERROR (in 0:00:06)
12:16:21 Error occured, aborting
12:16:21 Traceback (most recent call last):
12:16:21 File "/usr/lib/python2.7/site-packages/ovirtlago/cmd.py", line 360, in do_run
12:16:21 self.cli_plugins[args.ovirtverb].do_run(args)
12:16:21 File "/usr/lib/python2.7/site-packages/lago/plugins/cli.py", line 184, in do_run
12:16:21 self._do_run(**vars(args))
12:16:21 File "/usr/lib/python2.7/site-packages/lago/utils.py", line 501, in wrapper
12:16:21 return func(*args, **kwargs)
12:16:21 File "/usr/lib/python2.7/site-packages/lago/utils.py", line 512, in wrapper
12:16:21 return func(*args, prefix=prefix, **kwargs)
12:16:21 File "/usr/lib/python2.7/site-packages/ovirtlago/cmd.py", line 292, in do_ovirt_stop
12:16:21 prefix.virt_env.engine_vm().stop_all_hosts()
12:16:21 File "/usr/lib/python2.7/site-packages/ovirtlago/utils.py", line 145, in wrapped_func
12:16:21 return func(*args, **kwargs)
12:16:21 File "/usr/lib/python2.7/site-packages/ovirtlago/virt.py", line 390, in stop_all_hosts
12:16:21 host_service.deactivate()
12:16:21 File "/usr/lib64/python2.7/site-packages/ovirtsdk4/services.py", line 30877, in deactivate
12:16:21 return self._internal_action(action, 'deactivate', None, headers, query, wait)
12:16:21 File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 290, in _internal_action
12:16:21 return future.wait() if wait else future
12:16:21 File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 53, in wait
12:16:21 return self._code(response)
12:16:21 File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 287, in callback
12:16:21 self._check_fault(response)
12:16:21 File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 125, in _check_fault
12:16:21 self._raise_error(response, body.fault)
12:16:21 File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 109, in _raise_error
12:16:21 raise error
12:16:21 Error: Fault reason is "Operation Failed". Fault detail is "[Cannot switch Host to Maintenance mode. Host has asynchronous running tasks,
12:16:21 wait for operation to complete and retry.]". HTTP response code is 409.