[Webkit-unassigned] [Bug 255873] New: REGRESSION: iOS layout tests intermittently failing with TypeError: 'NoneType' object is not subscriptable in _test_passes_fuzzy_matching

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255873

            Bug ID: 255873
           Summary: REGRESSION: iOS layout tests intermittently failing
                    with TypeError: 'NoneType' object is not subscriptable
                    in _test_passes_fuzzy_matching
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com

iOS layout tests on EWS appear to be intermittently failing with the following exception:

Traceback (most recent call last):
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py", line 92, in main
    run_details = run(port, options, args, stderr)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py", line 522, in run
    run_details = manager.run(args)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 413, in run
    temp_initial_results, temp_retry_results, temp_enabled_pixel_tests_in_retry = self._run_test_subset(test_inputs, device_type=device_type)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 487, in _run_test_subset
    initial_results = self._run_tests(test_inputs, self._options.repeat_each, self._options.iterations, int(self._options.child_processes), retrying=False, device_type=device_type)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 570, in _run_tests
    return self._runner.run_tests(self._expectations[device_type], new_test_inputs, num_workers, retrying, device_type)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 180, in run_tests
    pool.wait()
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 432, in wait
    self.queue.receive()(self)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 134, in __call__
    reraise(*self.exc_info)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/libraries/autoinstalled/python-3-arm64/six.py", line 702, in reraise
    raise value.with_traceback(tb)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 303, in main
    queue.send(_Result(value=task(None), id=task.id))
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 56, in __call__
    return self.function(*self.args, **self.kwargs)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 77, in run_shard
    return Worker.instance.run_tests(shard)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 319, in run_tests
    Worker.instance.run_test(input, shard.name)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 347, in run_test
    result = self._run_test_with_or_without_timeout(test_input, test_timeout_sec, stop_when_done)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 404, in _run_test_with_or_without_timeout
    return self._run_test_in_this_thread(test_input, stop_when_done)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 490, in _run_test_in_this_thread
    return self._run_single_test(self._driver, test_input, stop_when_done)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 493, in _run_single_test
    return single_test_runner.run_single_test(
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 48, in run_single_test
    return runner.run()
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 123, in run
    return self._run_reftest()
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 370, in _run_reftest
    test_result = self._compare_output_with_reference(reference_output, test_output, reference_filename, expectation == '!=')
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 476, in _compare_output_with_reference
    diff_result.passed = self._test_passes_fuzzy_matching(fuzzy_tolerance, diff_result.fuzzy_data)
  File "/Volumes/Data/worker/iOS-16-Simulator-WPT-WK2-Tests-EWS/build/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 431, in _test_passes_fuzzy_matching
    actualMaxDifference = fuzzy_result['max_difference']
TypeError: 'NoneType' object is not subscriptable (from worker/0)

https://ews-build.webkit.org/#/builders/39/builds/1913/steps/17/logs/stdio

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