The failures seem to be all in different tests. Not sure what can be done here from the sheriffs' side.

kbr, any ideas?

These two failures:

WebglConformance_conformance_misc_type_conversion_test
https://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_ng/builds/392534
https://chromium-swarm.appspot.com/task?id=347b1e2f1590d710&refresh=10&show_raw=1

and:

WebglConformance_conformance_extensions_angle_instanced_arrays_out_of_bounds
https://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_ng/builds/392366
https://chromium-swarm.appspot.com/task?id=347a8641a5e0c510&refresh=10&show_raw=1

were timeouts while Telemetry was talking to the browser via DevTools. There was no minidump. Maybe the renderer process hung? No evidence of what went wrong.

-----
Traceback (most recent call last):
  _RunGpuTest at content/test/gpu/gpu_tests/gpu_integration_test.py:73
    self.RunActualGpuTest(url, *args)
  RunActualGpuTest at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:203
    getattr(self, test_name)(test_path, *args[1:])
  _RunConformanceTest at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:217
    self._CheckTestCompletion()
  _CheckTestCompletion at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:212
    if not self._DidWebGLTestSucceed(self.tab):
  _DidWebGLTestSucceed at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:332
    return tab.EvaluateJavaScript2('webglTestHarness._allTestSucceeded')
  traced_function at third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  EvaluateJavaScript2 at third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py:199
    return self.EvaluateJavaScript(*args, **kwargs)
  traced_function at third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  EvaluateJavaScript at third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py:167
    return self._inspector_backend.EvaluateJavaScript(*args, **kwargs)
  traced_function at third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  inner at third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:40
    inspector_backend._ConvertExceptionFromInspectorWebsocket(e)
  traced_function at third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  inner at third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:37
    return func(inspector_backend, *args, **kwargs)
  EvaluateJavaScript at third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:244
    return self._runtime.Evaluate(expression, context_id, timeout)
  Evaluate at third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_runtime.py:45
    res = self._inspector_websocket.SyncRequest(request, timeout)
  SyncRequest at third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_websocket.py:110
    res = self._Receive(timeout)
  _Receive at third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_websocket.py:149
    data = self._socket.recv()
  recv at third_party/catapult/telemetry/third_party/websocket-client/websocket/_core.py:293
    opcode, data = self.recv_data()
  recv_data at third_party/catapult/telemetry/third_party/websocket-client/websocket/_core.py:310
    opcode, frame = self.recv_data_frame(control_frame)
  recv_data_frame at third_party/catapult/telemetry/third_party/websocket-client/websocket/_core.py:323
    frame = self.recv_frame()
  recv_frame at third_party/catapult/telemetry/third_party/websocket-client/websocket/_core.py:357
    return self.frame_buffer.recv_frame()
  recv_frame at third_party/catapult/telemetry/third_party/websocket-client/websocket/_abnf.py:336
    self.recv_header()
  recv_header at third_party/catapult/telemetry/third_party/websocket-client/websocket/_abnf.py:286
    header = self.recv_strict(2)
  recv_strict at third_party/catapult/telemetry/third_party/websocket-client/websocket/_abnf.py:371
    bytes_ = self.recv(min(16384, shortage))
  _recv at third_party/catapult/telemetry/third_party/websocket-client/websocket/_core.py:427
    return recv(self.sock, bufsize)
  recv at third_party/catapult/telemetry/third_party/websocket-client/websocket/_socket.py:83
    raise WebSocketTimeoutException(message)
TimeoutException: 
********************************************************************************
(/b/s/w/ir_HOk29/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:489 _ConvertExceptionFromInspectorWebsocket) The app is probably crashed:

Found Minidump: False
Stack Trace:
********************************************************************************
	No crash dump found.
********************************************************************************
-----

WebglConformance_conformance_glsl_misc_shader_with_non_reserved_words
https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng/builds/387119

This was  Issue 649485 .

Note: if a pattern emerges regarding hangs then we'll mark tests flaky. Until then we'll monitor chromium-try-flakes.

It could be https://github.com/catapult-project/catapult/issues/3218

As per offline conversation with kbr@: I'll check in if there are more flakes by end of day, and I'll remove the Sheriff label if not.

It's approaching end of day for me and there are no new flake reports, so I'm removing the sheriff label.

Thanks Fady for checking. I think this round of flakes is understood, and there's no widespread issue ongoing. Let's close this as WontFix, expecting chromium-try-flakes to file a new bug if it reoccurs.