heat stack failed to create due to "DBReferenceError (IntegrityError)"

heat stack failed to create due to "DBReferenceError (IntegrityError)" when do heat stress tess in scalability testbed.
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/rally/task/runner.py", line 64, in _run_scenario_once method_name)(**kwargs) or scenario_output
File "/root/.rally/plugins/scenario/stack_seeding.py", line 15, in populate_stacks self._create_stack(template_path, parameters, files, environment)
File "/usr/local/lib/python2.7/dist-packages/rally/task/atomic.py", line 84, in func_atomic_actions f = func(self, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rally/plugins/openstack/scenarios/heat/utils.py", line 143, in _create_stack stack_id = self.clients("heat").stacks.create(**kw)["stack"]["id"]
File "/usr/local/lib/python2.7/dist-packages/heatclient/v1/stacks.py", line 136, in create data=kwargs, headers=headers)
File "/usr/local/lib/python2.7/dist-packages/heatclient/common/http.py", line 287, in post return self.client_request("POST", url, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/heatclient/common/http.py", line 277, in client_request resp, body = self.json_request(method, url, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/heatclient/common/http.py", line 266, in json_request resp = self._http_request(url, method, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/heatclient/common/http.py", line 221, in _http_request raise exc.from_response(resp) HTTPInternalServerError: ERROR: Remote error: DBReferenceError (IntegrityError) (1452, 'Cannot add or update a child row: a foreign key constraint fails (`heat`.`stack_lock`, CONSTRAINT `stack_lock_ibfk_1` FOREIGN KEY (`stack_id`) REFERENCES `stack` (`id`))') 'INSERT INTO stack_lock (created_at, updated_at, stack_id, engine_id) VALUES (%s, %s, %s, %s)' (datetime.datetime(2016, 1, 14, 11, 53, 37, 303071), None, 'accce34f-f938-4243-8b0f-23e3bc3f5db7', '18960d6f-cfac-4340-805a-0ad0c9aff4d9')