Filed by: nbeleuzu [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=316498080&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/MKR9uXGsSJKECA92c0H5UQ/runs/0/artifacts/public/logs/live_backing.log

[task 2020-09-23T14:51:55.641Z] 14:51:55     INFO - TEST-START | /dom/events/scrolling/scrollend-event-for-user-scroll.html
[task 2020-09-23T14:51:55.660Z] 14:51:55     INFO - Setting pref dom.w3c_touch_events.legacy_apis.enabled (true)
[task 2020-09-23T14:51:55.679Z] 14:51:55     INFO - Setting pref privacy.reduceTimerPrecision (false)
[task 2020-09-23T14:51:56.155Z] 14:51:56     INFO - {'actions': [{u'type': u'none', u'id': u'0', u'actions': [{u'duration': 16, u'type': u'pause'}, {u'duration': 16, u'type': u'pause'}, {u'duration': 16, u'type': u'pause'}, {u'duration': 300, u'type': u'pause'}, {u'duration': 16, u'type': u'pause'}]}, {u'type': u'pointer', u'actions': [{u'y': 150, u'x': 100, u'frame': {u'frame': u'window'}, u'type': u'pointerMove', u'origin': {'element-6066-11e4-a52e-4f735466cecf': u'9aedd46d-550b-44ba-a8bd-f69d512b17e4', 'chromeelement-9fc5-4b51-a3c8-01716eedeb04': u'9aedd46d-550b-44ba-a8bd-f69d512b17e4'}}, {u'button': 0, u'type': u'pointerDown'}, {u'y': 190, u'x': 100, u'frame': {u'frame': u'window'}, u'type': u'pointerMove', u'origin': {'element-6066-11e4-a52e-4f735466cecf': u'9aedd46d-550b-44ba-a8bd-f69d512b17e4', 'chromeelement-9fc5-4b51-a3c8-01716eedeb04': u'9aedd46d-550b-44ba-a8bd-f69d512b17e4'}}, {u'y': 230, u'x': 100, u'frame': {u'frame': u'window'}, u'type': u'pointerMove', u'origin': {'element-6066-11e4-a52e-4f735466cecf': u'9aedd46d-550b-44ba-a8bd-f69d512b17e4', 'chromeelement-9fc5-4b51-a3c8-01716eedeb04': u'9aedd46d-550b-44ba-a8bd-f69d512b17e4'}}, {u'button': 0, u'type': u'pointerUp'}], u'parameters': {u'pointerType': u'mouse'}, u'id': u'pointer1'}]}
[task 2020-09-23T14:51:56.548Z] 14:51:56     INFO - PID 2324 | [Child 5884, Main Thread] WARNING: NS_ENSURE_TRUE(info) failed: file /builds/worker/checkouts/gecko/extensions/permissions/PermissionDelegateHandler.cpp, line 348
[task 2020-09-23T14:51:56.548Z] 14:51:56     INFO - PID 2324 | [Child 5884, Main Thread] WARNING: NS_ENSURE_TRUE(wc) failed: file /builds/worker/checkouts/gecko/extensions/permissions/PermissionDelegateHandler.cpp, line 344
[task 2020-09-23T14:51:56.558Z] 14:51:56     INFO - PID 2324 | [Child 8188, Main Thread] WARNING: NS_ENSURE_TRUE(info) failed: file /builds/worker/checkouts/gecko/extensions/permissions/PermissionDelegateHandler.cpp, line 348
[task 2020-09-23T14:52:26.160Z] 14:52:26     INFO - TEST-UNEXPECTED-TIMEOUT | /dom/events/scrolling/scrollend-event-for-user-scroll.html | expected ERROR
[task 2020-09-23T14:52:26.160Z] 14:52:26     INFO - TEST-INFO expected ERROR | took 30519ms```

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

New occurrence:
https://treeherder.mozilla.org/logviewer?job_id=336111959&repo=mozilla-central&lineNumber=9244

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

Recent failure log: https://treeherder.mozilla.org/logviewer?job_id=345509274&repo=mozilla-central&lineNumber=6113

This failed since bug 1719354 modified the test expectations.

https://hg.mozilla.org/mozilla-central/rev/8fe101d17fe7