Filed by: nerli [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=262945734&repo=autoland
Full log: https://queue.taskcluster.net/v1/task/OHd3f-UXQjKqLSU3Q7xbfQ/runs/0/artifacts/public/logs/live_backing.log

[task 2019-08-22T15:32:31.846Z] 15:32:31 INFO - TEST-START | /IndexedDB/bigint_value.htm
[task 2019-08-22T15:32:31.862Z] 15:32:31 INFO - Closing window 27
[task 2019-08-22T15:32:42.260Z] 15:32:42 INFO -
[task 2019-08-22T15:32:42.260Z] 15:32:42 INFO - TEST-PASS | /IndexedDB/bigint_value.htm | BigInts as values in IndexedDB - primitive BigInt
[task 2019-08-22T15:32:42.260Z] 15:32:42 INFO - TEST-UNEXPECTED-TIMEOUT | /IndexedDB/bigint_value.htm | BigInts as values in IndexedDB - BigInt object - Test timed out
[task 2019-08-22T15:32:42.261Z] 15:32:42 INFO -
[task 2019-08-22T15:32:42.261Z] 15:32:42 INFO - TEST-UNEXPECTED-TIMEOUT | /IndexedDB/bigint_value.htm | BigInts as values in IndexedDB - primitive BigInt inside object - Test timed out
[task 2019-08-22T15:32:42.261Z] 15:32:42 INFO -
[task 2019-08-22T15:32:42.262Z] 15:32:42 INFO - TEST-UNEXPECTED-TIMEOUT | /IndexedDB/bigint_value.htm | BigInts as values in IndexedDB - BigInt object inside object - Test timed out
[task 2019-08-22T15:32:42.262Z] 15:32:42 INFO - TEST-UNEXPECTED-TIMEOUT | /IndexedDB/bigint_value.htm | expected OK
[task 2019-08-22T15:32:42.262Z] 15:32:42 INFO - TEST-INFO took 10414ms
[task 2019-08-22T15:32:42.279Z] 15:32:42 INFO - PID 1564 | 1566487962273 Marionette INFO Stopped listening on port 59428
[task 2019-08-22T15:32:43.178Z] 15:32:43 INFO - Browser exited with return code 0
[task 2019-08-22T15:32:43.178Z] 15:32:43 INFO - PROCESS LEAKS None
[task 2019-08-22T15:32:43.179Z] 15:32:43 INFO - Closing logging queue
[task 2019-08-22T15:32:43.180Z] 15:32:43 INFO - queue closed
[task 2019-08-22T15:32:43.201Z] 15:32:43 INFO - Setting up ssl
[task 2019-08-22T15:32:43.237Z] 15:32:43 INFO - certutil |
[task 2019-08-22T15:32:43.257Z] 15:32:43 INFO - certutil |
[task 2019-08-22T15:32:43.274Z] 15:32:43 INFO - certutil |
[task 2019-08-22T15:32:43.274Z] 15:32:43 INFO - Certificate Nickname Trust Attributes
[task 2019-08-22T15:32:43.274Z] 15:32:43 INFO - SSL,S/MIME,JAR/XPI
[task 2019-08-22T15:32:43.274Z] 15:32:43 INFO -
[task 2019-08-22T15:32:43.275Z] 15:32:43 INFO - web-platform-tests CT,,
[task 2019-08-22T15:32:43.275Z] 15:32:43 INFO -
[task 2019-08-22T15:32:43.290Z] 15:32:43 INFO - Application command: /builds/worker/workspace/build/application/firefox/firefox --marionette about:blank -profile /tmp/tmpj4vtm2.mozrunner
[task 2019-08-22T15:32:43.294Z] 15:32:43 INFO - Starting runner
[task 2019-08-22T15:32:43.863Z] 15:32:43 INFO - PID 1814 | 1566487963855 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: mozillaAddons
[task 2019-08-22T15:32:43.866Z] 15:32:43 INFO - PID 1814 | 1566487963855 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: telemetry
[task 2019-08-22T15:32:43.866Z] 15:32:43 INFO - PID 1814 | 1566487963855 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: resource://pdf.js/
[task 2019-08-22T15:32:43.866Z] 15:32:43 INFO - PID 1814 | 1566487963855 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: about:reader*
[task 2019-08-22T15:32:46.035Z] 15:32:46 INFO - PID 1814 | GLib-GIO-Message: Using the 'memory' GSettings backend. Your settings will not be saved or shared with other applications.
[task 2019-08-22T15:32:47.102Z] 15:32:47 INFO - PID 1814 | 1566487967090 Marionette INFO Listening on port 59428

This seems to be a regression of Bug1563023.

Jan, could you please check this?

Looking.

It looks more like bug 1575055 I think.

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup