Bug: Intermittent  browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after first search -
Status: RESOLVED
Priority: P5
Resolution: FIXED
Created: 2020-11-10 22:30:54+00:00
Resolved: 2022-04-07 16:49:16+00:00

**Filed by:** abutkovits [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=321341172&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/FK6ilFt3REmQDNOGweaebw/runs/0/artifacts/public/logs/live_backing.log
**Reftest URL:** https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/FK6ilFt3REmQDNOGweaebw/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

---
```
[task 2020-11-10T17:48:24.924Z] 17:48:24     INFO - TEST-START | browser/components/preferences/tests/browser_experimental_features_filter.js
[task 2020-11-10T17:48:25.257Z] 17:48:25     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0x110b10c00 == 11 [pid = 1667] [id = 21]
[task 2020-11-10T17:48:25.257Z] 17:48:25     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 27 (0x1096f4740) [pid = 1667] [serial = 50] [outer = 0x0]
[task 2020-11-10T17:48:25.257Z] 17:48:25     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 28 (0x110b14c00) [pid = 1667] [serial = 51] [outer = 0x1096f4740]
[task 2020-11-10T17:48:25.812Z] 17:48:25     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 27 (0x1235f83c0) [pid = 1667] [serial = 30] [outer = 0x0] [url = about:preferences?definitionsUrl=http%3A%2F%2Flocalhost%3A50566%2Fdefinitions.json#paneExperimental]
[task 2020-11-10T17:48:25.812Z] 17:48:25     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 26 (0x11e6273c0) [pid = 1667] [serial = 38] [outer = 0x0] [url = about:blank]
[task 2020-11-10T17:48:25.923Z] 17:48:25     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 27 (0x1568a3400) [pid = 1667] [serial = 52] [outer = 0x1096f4740]
[task 2020-11-10T17:48:27.705Z] 17:48:27     INFO - GECKO(1667) | [Parent 1667, Main Thread] WARNING: NS_ENSURE_SUCCESS(rv, rv) failed with result 0x80004005 (NS_ERROR_FAILURE): file /builds/worker/checkouts/gecko/dom/base/nsContentUtils.cpp:3779
[task 2020-11-10T17:48:27.738Z] 17:48:27     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0x122802400 == 12 [pid = 1667] [id = 22]
[task 2020-11-10T17:48:27.739Z] 17:48:27     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 28 (0x1235f8200) [pid = 1667] [serial = 53] [outer = 0x0]
[task 2020-11-10T17:48:27.968Z] 17:48:27     INFO - GECKO(1667) | [Parent 1667, Main Thread] WARNING: NS_ENSURE_TRUE(presShell) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4280
[task 2020-11-10T17:48:28.453Z] 17:48:28     INFO - GECKO(1667) | [Parent 1667: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 29 (0x1570bf400) [pid = 1667] [serial = 54] [outer = 0x1235f8200]
[task 2020-11-10T17:48:31.264Z] 17:48:31     INFO - GECKO(1667) | [Parent 1667, Main Thread] WARNING: NS_ENSURE_SUCCESS(rv, rv) failed with result 0x80040111 (NS_ERROR_NOT_AVAILABLE): file /builds/worker/checkouts/gecko/netwerk/cache/nsApplicationCacheService.cpp:180
[task 2020-11-10T17:48:31.381Z] 17:48:31     INFO - TEST-INFO | started process screencapture
[task 2020-11-10T17:48:31.464Z] 17:48:31     INFO - TEST-INFO | screencapture: exit 0
[task 2020-11-10T17:48:31.464Z] 17:48:31     INFO - Buffered messages logged at 17:48:24
[task 2020-11-10T17:48:31.465Z] 17:48:31     INFO - Entering test bound testFilterFeatures
[task 2020-11-10T17:48:31.465Z] 17:48:31     INFO - Buffered messages logged at 17:48:28
[task 2020-11-10T17:48:31.465Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA not initially hidden - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB not initially hidden - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC not initially hidden - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD not initially hidden - 
[task 2020-11-10T17:48:31.466Z] 17:48:31     INFO - Buffered messages logged at 17:48:31
[task 2020-11-10T17:48:31.467Z] 17:48:31     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2020-11-10T17:48:31.467Z] 17:48:31     INFO - Buffered messages finished
[task 2020-11-10T17:48:31.467Z] 17:48:31     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after first search - ```