Bug: Intermittent browser/modules/test/browser/browser_preloading_tab_moving.js | single tracking bug
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-07-20 06:21:06+00:00
Resolved: 2025-02-10 12:12:02+00:00

**Filed by:** bszekely [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=384856513&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Lv64sFDTQEyW7rLDzQ5zaw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-07-20T05:59:09.113Z] 05:59:09     INFO - TEST-START | browser/modules/test/browser/browser_preloading_tab_moving.js
[task 2022-07-20T05:59:09.121Z] 05:59:09     INFO - TEST-INFO | started process screenshot
[task 2022-07-20T05:59:09.255Z] 05:59:09     INFO - TEST-INFO | screenshot: exit 0
[task 2022-07-20T05:59:09.269Z] 05:59:09     INFO - Buffered messages logged at 05:59:09
[task 2022-07-20T05:59:09.269Z] 05:59:09     INFO - Entering test bound moving_works
[task 2022-07-20T05:59:09.270Z] 05:59:09     INFO - Buffered messages finished
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - TEST-UNEXPECTED-FAIL | browser/modules/test/browser/browser_preloading_tab_moving.js | Should have preloaded browser - Didn't expect null, but got it
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - Stack trace:
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:test_isnot:1448
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochitests/content/browser/browser/modules/test/browser/browser_preloading_tab_moving.js:moving_works:69
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:handleTask:988
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1060
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1195
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:977
[task 2022-07-20T05:59:09.271Z] 05:59:09     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1041
[task 2022-07-20T05:59:09.272Z] 05:59:09     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - TEST-UNEXPECTED-FAIL | browser/modules/test/browser/browser_preloading_tab_moving.js | Uncaught exception in test - at chrome://mochitests/content/browser/browser/modules/test/browser/browser_preloading_tab_moving.js:71 - TypeError: can't access property "permanentKey", gBrowser.preloadedBrowser is null
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - Stack trace:
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - moving_works@chrome://mochitests/content/browser/browser/modules/test/browser/browser_preloading_tab_moving.js:71:16
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - handleTask@chrome://mochikit/content/browser-test.js:988:26
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - _runTaskBasedTest@chrome://mochikit/content/browser-test.js:1060:18
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:1195:14
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - nextTest/<@chrome://mochikit/content/browser-test.js:977:14
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - SimpleTest.waitForFocus/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:1041:13
[task 2022-07-20T05:59:09.273Z] 05:59:09     INFO - Leaving test bound moving_works
[task 2022-07-20T05:59:09.274Z] 05:59:09     INFO - Entering test bound moving_shouldnt_move_across_private_state
[task 2022-07-20T05:59:09.274Z] 05:59:09     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-07-20T05:59:09.275Z] 05:59:09     INFO - TEST-UNEXPECTED-FAIL | browser/modules/test/browser/browser_preloading_tab_moving.js | Should have preloaded browser - Didn't expect null, but got it
[task 2022-07-20T05:59:09.275Z] 05:59:09     INFO - Stack trace:
[task 2022-07-20T05:59:09.275Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:test_isnot:1448
[task 2022-07-20T05:59:09.275Z] 05:59:09     INFO - chrome://mochitests/content/browser/browser/modules/test/browser/browser_preloading_tab_moving.js:moving_shouldnt_move_across_private_state:115
[task 2022-07-20T05:59:09.275Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:handleTask:988
[task 2022-07-20T05:59:09.275Z] 05:59:09     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1060
[task 2022-07-20T05:59:09.276Z] 05:59:09     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-07-20T05:59:09.277Z] 05:59:09     INFO - TEST-UNEXPECTED-FAIL | browser/modules/test/browser/browser_preloading_tab_moving.js | Uncaught exception in test - at chrome://mochitests/content/browser/browser/modules/test/browser/browser_preloading_tab_moving.js:117 - TypeError: can't access property "permanentKey", gBrowser.preloadedBrowser is null
[task 2022-07-20T05:59:09.277Z] 05:59:09     INFO - Stack trace:
[task 2022-07-20T05:59:09.277Z] 05:59:09     INFO - moving_shouldnt_move_across_private_state@chrome://mochitests/content/browser/browser/modules/test/browser/browser_preloading_tab_moving.js:117:16
[task 2022-07-20T05:59:09.277Z] 05:59:09     INFO - handleTask@chrome://mochikit/content/browser-test.js:988:26
[task 2022-07-20T05:59:09.277Z] 05:59:09     INFO - _runTaskBasedTest@chrome://mochikit/content/browser-test.js:1060:18
[task 2022-07-20T05:59:09.277Z] 05:59:09     INFO - Leaving test bound moving_shouldnt_move_across_private_state
[task 2022-07-20T05:59:09.278Z] 05:59:09     INFO - GECKO(4360) | MEMORY STAT | vsize 2112540MB | vsizeMaxContiguous 67381443MB | residentFast 357MB | heapAllocated 175MB
[task 2022-07-20T05:59:09.278Z] 05:59:09     INFO - TEST-OK | browser/modules/test/browser/browser_preloading_tab_moving.js | took 20ms
[task 2022-07-20T05:59:09.279Z] 05:59:09     INFO - checking window state
[task 2022-07-20T05:59:09.279Z] 05:59:09     INFO - GECKO(4360) | Completed ShutdownLeaks collections in process 5996
[task 2022-07-20T05:59:09.279Z] 05:59:09     INFO - TEST-START | Shutdown
```