https://wmatrix.googleplex.com/testrun/unfiltered?test_ids=366136635 

https://wmatrix.googleplex.com/testrun/unfiltered?test_ids=366105962

10/19 04:08:52.301 DEBUG|    cros_interface:0067|  > stdout=[], stderr=[Traceback (most recent call last):
  File "/usr/local/autotest/bin/screenshot.py", line 21, in <module>
    image = crtcScreenshot(args.crtc)
  File "/usr/local/autotest/cros/graphics/drm.py", line 427, in crtcScreenshot
    "Unable to take screenshot. There may not be anything on the screen.")
RuntimeError: Unable to take screenshot. There may not be anything on the screen.
]
10/19 04:08:52.302 ERROR|           browser:0062| Failure while starting browser backend.
Traceback (most recent call last):
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 55, in __init__
    self._browser_backend.Start()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 157, in Start
    'Failed to restart browser in guest mode (pid %d).' % pid)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 274, in _RaiseOnLoginFailure
    raise exceptions.LoginException(error)
LoginException: Failed to restart browser in guest mode (pid 5670).
10/19 04:08:52.311 ERROR|            chrome:0182| Timed out logging in, tries=2, error=LoginException('Failed to restart browser in guest mode (pid 5670).',)
10/19 04:08:52.323 DEBUG|        base_utils:0185| Running 'logger "autotest finished iteration /usr/local/autotest/results/default/graphics_Idle/sysinfo/iteration.1"'
10/19 04:08:52.334 WARNI|              test:0606| Autotest caught exception when running test:
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 810, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled LoginException: Failed to restart browser in guest mode (pid 5670).
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 804, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 461, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 376, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/graphics_Idle/graphics_Idle.py", line 38, in run_once
    arc_mode=arc_mode):
  File "/usr/local/autotest/common_lib/cros/chrome.py", line 174, in __init__
    self._browser = browser_to_create.Create(finder_options)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_finder.py", line 50, in Create
    self._credentials_path)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_with_oobe.py", line 14, in __init__
    backend, platform_backend, credentials_path)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 55, in __init__
    self._browser_backend.Start()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 157, in Start
    'Failed to restart browser in guest mode (pid %d).' % pid)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 274, in _RaiseOnLoginFailure
    raise exceptions.LoginException(error)
LoginException: Failed to restart browser in guest mode (pid 5670).