Comment 2 for bug 1800447

Andrey,

Let me complete the stack trace:

Task is:
---
  KeystoneBasic.authenticate_user_and_validate_token:
    -
      runner:
        type: "constant_for_duration"
        duration: 100
        concurrency: 1

Task syntax is correct :)
Running Rally version 1.1.0
--------------------------------------------------------------------------------
Task 644fde0c-82a4-46e0-9d7d-c2082bd71f8f: started
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Running Task... This can take a while...

To track task status use:

        rally task status
        or
        rally task detailed

Using task: 644fde0c-82a4-46e0-9d7d-c2082bd71f8f
2018-10-29 15:41:36.320 1 INFO rally.task.context [-] Task 644fde0c-82a4-46e0-9d7d-c2082bd71f8f | Context admin_cleanup@openstack cleanup() started
2018-10-29 15:41:39.914 1 INFO rally.task.context [-] Task 644fde0c-82a4-46e0-9d7d-c2082bd71f8f | Context admin_cleanup@openstack cleanup() finished in 3.59 sec
2018-10-29 15:41:39.914 1 INFO rally.task.context [-] Task 644fde0c-82a4-46e0-9d7d-c2082bd71f8f | Context users@openstack cleanup() started
2018-10-29 15:41:43.476 1 INFO rally.task.context [-] Task 644fde0c-82a4-46e0-9d7d-c2082bd71f8f | Context users@openstack cleanup() finished in 3.56 sec
2018-10-29 15:41:43.891 1 INFO rally.task.engine [-] Load duration is: 0.0
2018-10-29 15:41:43.891 1 INFO rally.task.engine [-] Full runner duration is: 0.0
2018-10-29 15:41:43.892 1 INFO rally.task.engine [-] Full duration is: 9.6213
2018-10-29 15:41:43.903 1 ERROR rally.task.engine [-] Unexpected exception during the workload execution: TypeError: 'NoneType' object is not callable
2018-10-29 15:41:43.903 1 ERROR rally.task.engine Traceback (most recent call last):
2018-10-29 15:41:43.903 1 ERROR rally.task.engine File "/usr/local/lib/python2.7/dist-packages/rally/task/engine.py", line 509, in _run_workload
2018-10-29 15:41:43.903 1 ERROR rally.task.engine workload["args"])
2018-10-29 15:41:43.903 1 ERROR rally.task.engine File "/usr/local/lib/python2.7/dist-packages/rally/task/runner.py", line 168, in run
2018-10-29 15:41:43.903 1 ERROR rally.task.engine self._run_scenario(scenario_plugin, "run", context, args)
2018-10-29 15:41:43.903 1 ERROR rally.task.engine File "/usr/local/lib/python2.7/dist-packages/rally/plugins/common/runners/constant.py", line 335, in _run_scenario
2018-10-29 15:41:43.903 1 ERROR rally.task.engine result = iter_result.next(timeout)
2018-10-29 15:41:43.903 1 ERROR rally.task.engine File "/usr/lib/python2.7/multiprocessing/pool.py", line 668, in next
2018-10-29 15:41:43.903 1 ERROR rally.task.engine raise value
2018-10-29 15:41:43.903 1 ERROR rally.task.engine TypeError: 'NoneType' object is not callable
2018-10-29 15:41:43.903 1 ERROR rally.task.engine
2018-10-29 15:41:43.926 1 INFO rally.task.engine [-] Task 644fde0c-82a4-46e0-9d7d-c2082bd71f8f | Completed: Running task.