1672603 - Intermittent /streams/transferable/window.html | Unhandled rejection: assert_array_equals: there should be no ports in the event lengths differ, expected array [] length 0, got [object "[object MessagePort]"] length 1

Status: RESOLVED DUPLICATE of bug 1672079

(Core :: JavaScript Engine, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: apavel [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=319299061&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Id_j9VYgQ7OvTmtrOg5HAg/runs/0/artifacts/public/logs/live_backing.log

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[task 2020-10-21T21:35:43.817Z] 21:35:43     INFO - TEST-START | /streams/transferable/window.html
[task 2020-10-21T21:35:43.826Z] 21:35:43     INFO - Closing window 15032385539
[task 2020-10-21T21:35:43.905Z] 21:35:43     INFO - PID 1216 | JavaScript error: , line 0: uncaught exception: Object
[task 2020-10-21T21:35:43.905Z] 21:35:43     INFO - PID 1216 | JavaScript error: , line 0: uncaught exception: Object
[task 2020-10-21T21:35:43.944Z] 21:35:43     INFO - TEST-UNEXPECTED-ERROR | /streams/transferable/window.html | Unhandled rejection: assert_array_equals: there should be no ports in the event lengths differ, expected array [] length 0, got [object "[object MessagePort]"] length 1
[task 2020-10-21T21:35:43.944Z] 21:35:43     INFO - testMessage@http://web-platform.test:8000/streams/transferable/resources/helpers.js:36:24
[task 2020-10-21T21:35:43.944Z] 21:35:43     INFO - testMessageEvent/</<@http://web-platform.test:8000/streams/transferable/resources/helpers.js:44:19
[task 2020-10-21T21:35:43.944Z] 21:35:43     INFO - TEST-INFO took 125ms
[task 2020-10-21T21:35:43.954Z] 21:35:43     INFO - PID 1216 | 1603316143949	Marionette	INFO	Stopped listening on port 50339
[task 2020-10-21T21:35:44.375Z] 21:35:44     INFO - Browser exited with return code 0
[task 2020-10-21T21:35:44.375Z] 21:35:44     INFO - PROCESS LEAKS None
[task 2020-10-21T21:35:44.375Z] 21:35:44     INFO - Closing logging queue
[task 2020-10-21T21:35:44.375Z] 21:35:44     INFO - queue closed
[task 2020-10-21T21:35:44.438Z] 21:35:44     INFO - Application command: C:\Users\task_1603314501\build\application\firefox\firefox.exe -marionette about:blank --wait-for-browser -profile c:\users\task_1603314501\appdata\local\temp\tmpnylahs
[task 2020-10-21T21:35:44.443Z] 21:35:44     INFO - PID 4648 | Can't find symbol 'eglSwapBuffersWithDamageEXT'.
[task 2020-10-21T21:35:44.443Z] 21:35:44     INFO - PID 4648 | Can't find symbol 'eglSetDamageRegionKHR'.
[task 2020-10-21T21:35:44.443Z] 21:35:44     INFO - PID 4648 | console.warn: SearchSettings: "get: No settings file exists, new profile?" (new Error("", "(unknown module)"))
[task 2020-10-21T21:35:44.443Z] 21:35:44     INFO - PID 4648 | 1603316084255	Marionette	INFO	Listening on port 50357
[task 2020-10-21T21:35:44.443Z] 21:35:44     INFO - Starting runner```