The bluetooth_TurnOnOffUI test fails with the following reason :

"Unhandled WebDriverException: Message: chrome not reachable"

Log trace : 

08/25 17:30:48.119 WARNI|              test:0606| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 806, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled WebDriverException: Message: chrome not reachable
  (Session info: chrome=70.0.3530.0)
  (Driver info: chromedriver=2.41,platform=Linux 11003.0.0 x86_64)

Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 800, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 464, in execute
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 371, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/bluetooth_TurnOnOffUI/bluetooth_TurnOnOffUI.py", line 142, in run_once
    self.turn_off_bluetooth(bt_page)
  File "/usr/local/autotest/common_lib/cros/chromedriver.py", line 111, in __exit__
    self.driver.close()
  File "/usr/local/lib64/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 510, in close
    self.execute(Command.CLOSE)
  File "/usr/local/lib64/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 236, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib64/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 192, in check_response
    raise exception_class(message, screen, stacktrace)
WebDriverException: Message: chrome not reachable
  (Session info: chrome=70.0.3530.0)
  (Driver info: chromedriver=2.41,platform=Linux 11003.0.0 x86_64)


08/25 17:30:49.257 ERROR|    graphics_utils:0519| Command <screenshot "/usr/local/autotest/results/default/bluetooth_TurnOnOffUI.UI/debug/chrome-0.png"> failed, rc=1, Command returned non-zero exit status
* Command: 
    screenshot "/usr/local/autotest/results/default/bluetooth_TurnOnOffUI.UI/
    debug/chrome-0.png"
Exit status: 1
Duration: 0.215208053589

stderr:
[0825/173049:ERROR:main.cc(100)] CRTC not found. Is the screen on?

Failure link :

https://stainless.corp.google.com/search?exclude_retried=true&first_date=2018-08-17&master_builder_name=&builder_name_number=&shard=&exclude_acts=true&builder_name=&master_builder_name_number=&owner=&retry=&exclude_cts=true&exclude_non_production=false&hostname=&board=&test=%5Ebluetooth_TurnOnOffUI%24&suite=bluetooth_qualification%7Cbluetooth_chameleon%7Cbluetooth_sanity%7Cbluetooth_stress&build=%5ER70%5C-11003%5C.0%5C.0%24&status=FAIL&status=ERROR&status=ABORT&reason=&waterfall=&exclude_not_run=false&last_date=2018-08-27&exclude_non_release=true&exclude_au=true&model=&view=list