Bug: Intermittent browser/components/preferences/tests/browser_change_app_handler.js | single tracking bug
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2024-11-08 00:59:58+00:00
Resolved: 2024-12-30 12:08:05+00:00

**Filed by:** nfay [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=481702822&repo=mozilla-central
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/LVRMim3pQrKVU9Umd5lrUQ/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2024-11-07T23:49:35.211Z] 23:49:35     INFO - TEST-START | browser/components/preferences/tests/browser_change_app_handler.js
[task 2024-11-07T23:49:35.213Z] 23:49:35     INFO - Entering test bound 
[task 2024-11-07T23:49:35.232Z] 23:49:35     INFO - TEST-PASS | browser/components/preferences/tests/browser_change_app_handler.js | Should have at least one known handler - 
[task 2024-11-07T23:49:35.382Z] 23:49:35     INFO - GECKO(8784) | console.error: "Failed to open Windows registry" ({})
[task 2024-11-07T23:49:35.668Z] 23:49:35     INFO - TEST-PASS | browser/components/preferences/tests/browser_change_app_handler.js | General pane was selected - 
[task 2024-11-07T23:49:35.670Z] 23:49:35     INFO - TEST-INFO | started process screenshot
[task 2024-11-07T23:49:35.761Z] 23:49:35     INFO - TEST-INFO | screenshot: exit 0
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_change_app_handler.js | handlersView is present - 
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - Stack trace:
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - chrome://mochikit/content/browser-test.js:test_ok:1599
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_change_app_handler.js:null:41
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - chrome://mochikit/content/browser-test.js:handleTask:1147
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1219
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1360
[task 2024-11-07T23:49:35.763Z] 23:49:35     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1136
[task 2024-11-07T23:49:35.764Z] 23:49:35     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2024-11-07T23:49:35.764Z] 23:49:35     INFO - Not taking screenshot here: see the one that was previously logged
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_change_app_handler.js | Uncaught exception in test bound  - at chrome://mochitests/content/browser/browser/components/preferences/tests/browser_change_app_handler.js:42 - TypeError: can't access property "scrollIntoView", ourItem is null
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - Stack trace:
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - @chrome://mochitests/content/browser/browser/components/preferences/tests/browser_change_app_handler.js:42:3
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - async*handleTask@chrome://mochikit/content/browser-test.js:1147:26
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - _runTaskBasedTest@chrome://mochikit/content/browser-test.js:1219:18
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:1360:14
[task 2024-11-07T23:49:35.765Z] 23:49:35     INFO - nextTest/<@chrome://mochikit/content/browser-test.js:1136:14
[task 2024-11-07T23:49:35.766Z] 23:49:35     INFO - SimpleTest.waitForFocus/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:1058:13
[task 2024-11-07T23:49:35.766Z] 23:49:35     INFO - Leaving test bound 
[task 2024-11-07T23:49:36.260Z] 23:49:36     INFO - GECKO(8784) | MEMORY STAT | vsize 2112790MB | vsizeMaxContiguous 64992498MB | residentFast 640MB | heapAllocated 390MB
[task 2024-11-07T23:49:36.261Z] 23:49:36     INFO - TEST-OK | browser/components/preferences/tests/browser_change_app_handler.js | took 1049ms
[task 2024-11-07T23:49:36.261Z] 23:49:36     INFO - Not taking screenshot here: see the one that was previously logged
[task 2024-11-07T23:49:36.262Z] 23:49:36     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_change_app_handler.js | Found an unexpected tab at the end of test run: about:preferences#general - 
[task 2024-11-07T23:49:36.292Z] 23:49:36     INFO - checking window state
[task 2024-11-07T23:49:36.304Z] 23:49:36     INFO - TEST-START | browser/components/preferences/tests/browser_checkspelling.js
```