Bug: Intermittent browser/components/preferences/tests/browser_proxy_backup.js | single tracking bug
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-09-04 21:09:57+00:00
Resolved: 2022-12-13 17:01:03+00:00

**Filed by:** abutkovits [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=389432746&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/UI_PvkRXTDiAo273KCGzzA/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-09-04T19:36:23.638Z] 19:36:23     INFO - TEST-START | browser/components/preferences/tests/browser_proxy_backup.js
[task 2022-09-04T19:38:03.871Z] 19:38:03     INFO - TEST-INFO | started process screenshot
[task 2022-09-04T19:38:03.939Z] 19:38:03     INFO - TEST-INFO | screenshot: exit 0
[task 2022-09-04T19:38:03.940Z] 19:38:03     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_proxy_backup.js | Test timed out - 
[task 2022-09-04T19:38:03.969Z] 19:38:03     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | about:preferences loaded - 
[task 2022-09-04T19:38:04.183Z] 19:38:04     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | Check the proper URL is loaded - 
[task 2022-09-04T19:38:04.184Z] 19:38:04     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | Element should not be null, when checking visibility - 
[task 2022-09-04T19:38:04.185Z] 19:38:04     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | Overlay is visible - 
[task 2022-09-04T19:38:04.186Z] 19:38:04     INFO - found chrome://browser/skin/preferences/preferences.css
[task 2022-09-04T19:38:04.186Z] 19:38:04     INFO - found chrome://global/skin/in-content/common.css
[task 2022-09-04T19:38:04.186Z] 19:38:04     INFO - found chrome://browser/skin/preferences/dialog.css
[task 2022-09-04T19:38:04.187Z] 19:38:04     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | All expectedStyleSheetURLs should have been found - 
[task 2022-09-04T19:38:04.217Z] 19:38:04     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | connection window opened - 
[task 2022-09-04T19:38:04.230Z] 19:38:04     INFO - TEST-PASS | browser/components/preferences/tests/browser_proxy_backup.js | connection window closed - 
[task 2022-09-04T19:38:04.234Z] 19:38:04     INFO - GECKO(4512) | JavaScript error: chrome://mochitests/content/browser/browser/components/preferences/tests/browser_proxy_backup.js, line 71: NS_ERROR_UNEXPECTED: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]
[task 2022-09-04T19:38:04.235Z] 19:38:04     INFO - Console message: [JavaScript Error: "NS_ERROR_UNEXPECTED: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]" {file: "chrome://mochitests/content/browser/browser/components/preferences/tests/browser_proxy_backup.js" line: 71}]
[task 2022-09-04T19:38:04.547Z] 19:38:04     INFO - GECKO(4512) | [GFX1-]: wr_renderer_render: OutOfMemory
[task 2022-09-04T19:38:04.548Z] 19:38:04     INFO - GECKO(4512) | [GFX1-]: Handling webrender error 2
[task 2022-09-04T19:38:09.378Z] 19:38:09     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-09-04T19:38:09.379Z] 19:38:09     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_proxy_backup.js | waiting for vsync to be disabled - timed out after 50 tries. - false == true - JS frame :: chrome://mochikit/content/browser-test.js :: ensureVsyncDisabled :: line 575
[task 2022-09-04T19:38:09.379Z] 19:38:09     INFO - Stack trace:
[task 2022-09-04T19:38:09.379Z] 19:38:09     INFO - chrome://mochikit/content/browser-test.js:ensureVsyncDisabled:575
[task 2022-09-04T19:38:09.380Z] 19:38:09     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-09-04T19:38:09.381Z] 19:38:09     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_proxy_backup.js | vsync remained enabled at the end of the test. Is there an animation still running? Consider talking to the performance team for tips to solve this. - false == true - JS frame :: chrome://mochikit/content/browser-test.js :: ensureVsyncDisabled :: line 576
[task 2022-09-04T19:38:09.381Z] 19:38:09     INFO - Stack trace:
[task 2022-09-04T19:38:09.381Z] 19:38:09     INFO - chrome://mochikit/content/browser-test.js:ensureVsyncDisabled:576
[task 2022-09-04T19:38:09.407Z] 19:38:09     INFO - GECKO(4512) | MEMORY STAT | vsize 1708MB | vsizeMaxContiguous 55MB | residentFast 790MB | heapAllocated 568MB
[task 2022-09-04T19:38:09.408Z] 19:38:09     INFO - TEST-OK | browser/components/preferences/tests/browser_proxy_backup.js | took 105796ms
[task 2022-09-04T19:38:09.409Z] 19:38:09     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-09-04T19:38:09.409Z] 19:38:09     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_proxy_backup.js | Found a tab after previous test timed out: about:preferences - 
[task 2022-09-04T19:38:09.446Z] 19:38:09     INFO - checking window state
[task 2022-09-04T19:38:09.456Z] 19:38:09     INFO - TEST-START | browser/components/preferences/tests/browser_sanitizeOnShutdown_prefLocked.js
```