[Webkit-unassigned] [Bug 230082] New: Running iOS layout tests sometimes fails with a utf-8 error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230082

            Bug ID: 230082
           Summary: Running iOS layout tests sometimes fails with a utf-8
                    error
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Running iOS layout tests sometimes fails with a script error:

run-webkit-tests --ios-simulator LayoutTests/imported/w3c/web-platform-tests/css/css-transforms

[This is with a local import of css-transforms WPT tests].

[116/790] imported/w3c/web-platform-tests/css/css-transforms/transform3d-backface-visibility-001.html passed                                  
UnicodeDecodeError raised: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte
Traceback (most recent call last):
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py", line 92, in main
    run_details = run(port, options, args, stderr)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py", line 494, in run
    run_details = manager.run(args)
  File "/Volumes/Data/Development/system/webkit/OpenSource/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/Development/system/webkit/OpenSource/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/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 566, in _run_tests
    return self._runner.run_tests(self._expectations[device_type], new_test_inputs, num_workers, retrying, device_type)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 175, in run_tests
    pool.do(
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 397, in do
    result = function(*args, **kwargs)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 76, in run_shard
    return Worker.instance.run_tests(shard)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 318, in run_tests
    Worker.instance.run_test(input, shard.name)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 346, in run_test
    result = self._run_test_with_or_without_timeout(test_input, test_timeout_sec, stop_when_done)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 403, in _run_test_with_or_without_timeout
    return self._run_test_in_this_thread(test_input, stop_when_done)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 489, in _run_test_in_this_thread
    return self._run_single_test(self._driver, test_input, stop_when_done)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 492, in _run_single_test
    return single_test_runner.run_single_test(
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 46, in run_single_test
    return runner.run()
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 118, in run
    return self._run_reftest()
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py", line 328, in _run_reftest
    reference_output = self._driver.run_test(DriverInput(reference_test_name, self._timeout, None, should_run_pixel_test=True), self._stop_when_done)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/port/driver.py", line 834, in run_test
    return self._driver.run_test(driver_input, stop_when_done)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/webkitpy/port/driver.py", line 246, in run_test
    text += string_utils.decode(out, target_type=str)
  File "/Volumes/Data/Development/system/webkit/OpenSource/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/string_utils.py", line 46, in decode
    return data.decode(encoding, errors=errors)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte
Stopping Web Platform Test server ...%

Python 2.7.16

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