Filed by: aciure [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=252013439&repo=autoland
Full log: https://queue.taskcluster.net/v1/task/Ih7vAO41SUKUaAKn8BwuMw/runs/0/artifacts/public/logs/live_backing.log

07:22:28 INFO - TEST-PASS | gfx/layers/apz/test/mochitest/browser_test_group_fission.js | http://mochi.test:8888/browser/gfx/layers/apz/test/mochitest/helper_fission_basic.html | Basic content fission test works -
07:22:28 INFO - Buffered messages logged at 07:21:47
07:22:28 INFO - TEST-PASS | gfx/layers/apz/test/mochitest/browser_test_group_fission.js | http://mochi.test:8888/browser/gfx/layers/apz/test/mochitest/helper_fission_transforms.html | code_for_oopif_to_run successfully installed -
07:22:28 INFO - Buffered messages finished
07:22:28 INFO - TEST-UNEXPECTED-FAIL | gfx/layers/apz/test/mochitest/browser_test_group_fission.js | Test timed out -
07:22:28 INFO - GECKO(3616) | MEMORY STAT vsizeMaxContiguous not supported in this build configuration.
07:22:28 INFO - GECKO(3616) | MEMORY STAT | vsize 5483MB | residentFast 327MB | heapAllocated 99MB
07:22:28 INFO - TEST-OK | gfx/layers/apz/test/mochitest/browser_test_group_fission.js | took 45029ms
07:22:28 INFO - checking window state
07:22:28 INFO - Not taking screenshot here: see the one that was previously logged
07:22:28 INFO - TEST-UNEXPECTED-FAIL | gfx/layers/apz/test/mochitest/browser_test_group_fission.js | Found a browser window after previous test timed out -
07:22:28 INFO - GECKO(3616) | must wait for focus
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3619
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3618
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3621
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3617
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3620
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3626
07:22:30 INFO - GECKO(3616) | Completed ShutdownLeaks collections in process 3616

Parking with me for now. Depending on how frequent it is I might make the subtest WR-only again.

Should be fixed by 1559565

Retroactively moving fixed bugs whose summaries mention "Fission" (or other Fission-related keywords) but are not assigned to a Fission Milestone to an appropriate Fission Milestone.

This will generate a lot of bugmail, so you can filter your bugmail for the following UUID and delete them en masse:

0ee3c76a-bc79-4eb2-8d12-05dc0b68e732