Tried to run this test in the chell device with 10718.50.0 manually, could not reproduce the issue.


Noticed that the failures started since R68-10625.0.0 on Chell: chromeos15-row1-rack11-host4.


Logs@
https://stainless.corp.google.com/search?view=matrix&row=test&col=build&first_date=2018-04-01&last_date=2018-07-16&test=network_WiFi_SuspendStress&hostname=chromeos15-row1-rack11-host4&status=GOOD&status=FAIL&status=ERROR&status=ABORT&exclude_cts=true&exclude_not_run=false&exclude_non_release=true&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false


Sample failure:

05/02 04:11:48.195 WARNI|              test:0637| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 631, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 837, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled error: [Errno 111] Connection refused
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 831, in _call_test_function
    return func(*args, **Suspecting the following change caused the issue:
https://crosland.corp.google.com/cl?q=4d822b48b0f9d549e661fb789021ac182437b818dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 495, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 362, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 400, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/network_WiFi_SuspendStress/network_WiFi_SuspendStress.py", line 147, in run_once
    stressor.wait()
  File "/usr/local/autotest/server/cros/stress.py", line 209, in wait
    self.reraise()
  File "/usr/local/autotest/server/cros/stress.py", line 61, in run
    self._loop_stressor()
  File "/usr/local/autotest/server/cros/stress.py", line 183, in _loop_stressor
    self.stressor()
  File "/usr/local/autotest/server/site_tests/network_WiFi_SuspendStress/network_WiFi_SuspendStress.py", line 103, in powerd_non_servo_wifi_suspend
    self.stress_wifi_suspend(try_servo=False)
  File "/usr/local/autotest/server/site_tests/network_WiFi_SuspendStress/network_WiFi_SuspendStress.py", line 88, in stress_wifi_suspend
    self.context.client.do_suspend(_DELAY)
  File "/usr/local/autotest/server/cros/network/wifi_client.py", line 734, in do_suspend
    self._shill_proxy.do_suspend(seconds)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1233, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1587, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.7/xmlrpclib.py", line 1273, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1301, in single_request
    self.send_content(h, request_body)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1448, in send_content
    connection.endheaders(request_body)
  File "/usr/lib/python2.7/httplib.py", line 1013, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python2.7/httplib.py", line 864, in _send_output
    self.send(msg)
  File "/usr/lib/python2.7/httplib.py", line 826, in send
    self.connect()
  File "/usr/lib/python2.7/httplib.py", line 807, in connect
    self.timeout, self.source_address)
  File "/usr/lib/python2.7/socket.py", line 571, in create_connection
    raise err
error: [Errno 111] Connection refused



Updated the lab device(chromeos15-row1-rack11-host4) firmware to 10718.215.0 since it had old firmware, and scheduled the suspendstress tests, it still fails with the same error.



Suspecting the following change caused the issue:
https://crosland.corp.google.com/cl?q=4d822b48b0f9d549e661fb789021ac182437b818



Will downgrade to last known working image ( R68- 10607.0.0) and try to rerun the tests.