Filed by: nbeleuzu [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=313428086&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/e0hmK3L9SeeFiUDq-fOysA/runs/0/artifacts/public/logs/live_backing.log

[task 2020-08-19T11:17:12.237Z] 11:17:12 INFO - Application command: /builds/worker/workspace/build/application/firefox/firefox -no-remote -marionette -profile /builds/worker/workspace/build/tmpA0cM3D.mozrunner
[task 2020-08-19T11:17:12.341Z] 11:17:12 ERROR - Process killed after 120s because no connection to Marionette server could be established. Check gecko.log for errors
[task 2020-08-19T11:17:12.341Z] 11:17:12 ERROR - Traceback (most recent call last):
[task 2020-08-19T11:17:12.341Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.341Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_harness/runtests.py", line 91, in cli
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - failed = harness_instance.run()
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_harness/runtests.py", line 71, in run
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - runner.run_tests(tests)
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_harness/runner/base.py", line 850, in run_tests
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - self.marionette = self.driverclass(**self._build_kwargs())
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_driver/marionette.py", line 465, in init
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - self.start_binary(self.startup_timeout)
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_driver/marionette.py", line 493, in start_binary
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - reraise(IOError, IOError(msg.format(timeout)), sys.exc_info()[2])
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_driver/marionette.py", line 485, in start_binary
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - self.raise_for_port(timeout=timeout)
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.342Z] 11:17:12 ERROR - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/marionette_driver/marionette.py", line 573, in raise_for_port
[task 2020-08-19T11:17:12.343Z] 11:17:12 ERROR - self.host, self.port))
[task 2020-08-19T11:17:12.343Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.343Z] 11:17:12 ERROR - IOError: Process killed after 120s because no connection to Marionette server could be established. Check gecko.log for errors
[task 2020-08-19T11:17:12.343Z] 11:17:12 ERROR -
[task 2020-08-19T11:17:12.385Z] 11:17:12 ERROR - Return code: 1
[task 2020-08-19T11:17:12.386Z] 11:17:12 ERROR - No checks run.
[task 2020-08-19T11:17:12.386Z] 11:17:12 ERROR - No suite end message was emitted by this harness.
[task 2020-08-19T11:17:12.386Z] 11:17:12 ERROR - # TBPL FAILURE #
[task 2020-08-19T11:17:12.386Z] 11:17:12 WARNING - setting return code to 2

Same as bug 1659965.