Filed by: ctuns [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=377220009&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/NpgKZcdPS2OQ71D2OW8Omw/runs/0/artifacts/public/logs/live_backing.log

[task 2022-05-07T01:21:02.545Z] 01:21:02     INFO - TEST-PASS | browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about_default_promo.js | Focus promo is shown in a new tab - {} == true - 
[task 2022-05-07T01:21:02.546Z] 01:21:02     INFO - Buffered messages finished
[task 2022-05-07T01:21:02.546Z] 01:21:02     INFO - TEST-UNEXPECTED-FAIL | browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about_default_promo.js | Uncaught exception in test - AbortError: Actor 'SpecialPowers' destroyed before query 'EnsureFocus' was resolved
[task 2022-05-07T01:21:02.547Z] 01:21:02     INFO - GECKO(1582) | [Child 1742, Main Thread] WARNING: '!CanSend() || !mManager || !mManager->CanSend()', file /builds/worker/checkouts/gecko/dom/ipc/jsactor/JSWindowActorChild.cpp:44
[task 2022-05-07T01:21:02.549Z] 01:21:02     INFO - Leaving test bound test_remove_promo_from_prerendered_tab_if_blocked
[task 2022-05-07T01:21:02.550Z] 01:21:02     INFO - GECKO(1582) | MEMORY STAT | vsize 11974MB | residentFast 691MB | heapAllocated 367MB
[task 2022-05-07T01:21:02.551Z] 01:21:02     INFO - TEST-OK | browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about_default_promo.js | took 17730ms
[task 2022-05-07T01:21:02.552Z] 01:21:02     INFO - GECKO(1582) | [Child 1746: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 7f227841d000 == 1 [pid = 1746] [id = 3]
[task 2022-05-07T01:21:02.554Z] 01:21:02     INFO - GECKO(1582) | [Child 1746: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 2 (7f2293395bc0) [pid = 1746] [serial = 8] [outer = 0]
[task 2022-05-07T01:21:02.555Z] 01:21:02     INFO - GECKO(1582) | [Child 1746: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 3 (7f227841d400) [pid = 1746] [serial = 9] [outer = 7f2293395bc0]
[task 2022-05-07T01:21:02.605Z] 01:21:02     INFO - checking window state
[task 2022-05-07T01:21:02.610Z] 01:21:02     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-05-07T01:21:02.611Z] 01:21:02     INFO - TEST-UNEXPECTED-FAIL | browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about_default_promo.js | Found an unexpected browser window at the end of test run - 
[task 2022-05-07T01:21:02.613Z] 01:21:02     INFO - GECKO(1582) | must wait for focus
[task 2022-05-07T01:21:03.006Z] 01:21:03     INFO - GECKO(1582) | [Parent 1582, Compositor] WARNING: Possibly dropping task posted to updater thread: file /builds/worker/checkouts/gecko/gfx/layers/apz/src/APZUpdater.cpp:365
[task 2022-05-07T01:21:03.012Z] 01:21:03     INFO - TEST-START | browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about_nimbus.js