Bug: Intermittent browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:11, x2:230, y1:12, y2:47, w:220, h:36}), window width: 1280 -
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-03-14 12:22:01+00:00
Resolved: 2022-04-12 17:09:34+00:00

**Filed by:** ctuns [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=370952569&repo=mozilla-central
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/f7j4tT_7RyKuki1miI6Djw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-03-14T11:38:27.431Z] 11:38:27     INFO - TEST-PASS | browser/base/content/test/performance/browser_tabopen.js | 0 unexpected reflows - true == true - 
[task 2022-03-14T11:38:27.432Z] 11:38:27     INFO - comparing 4 frames
[task 2022-03-14T11:38:27.432Z] 11:38:27     INFO - Buffered messages finished
[task 2022-03-14T11:38:27.433Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:11, x2:230, y1:12, y2:47, w:220, h:36}), window width: 1280 - 
[task 2022-03-14T11:38:27.433Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.433Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.433Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.433Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.433Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.434Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:235, x2:266, y1:12, y2:47, w:32, h:36}), window width: 1280 - 
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.435Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.436Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:1002, x2:1008, y1:24, y2:35, w:7, h:12}), window width: 1280 - 
[task 2022-03-14T11:38:27.436Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.436Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.436Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.436Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.436Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.437Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.438Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:1035, x2:1047, y1:24, y2:36, w:13, h:13}), window width: 1280 - 
[task 2022-03-14T11:38:27.438Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.438Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.438Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.438Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.438Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.439Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.440Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:1076, x2:1087, y1:26, y2:32, w:12, h:7}), window width: 1280 - 
[task 2022-03-14T11:38:27.440Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.440Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.440Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.440Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.440Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
<...>
[task 2022-03-14T11:38:27.529Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.529Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:236, x2:316, y1:12, y2:47, w:81, h:36}), window width: 1280 - 
[task 2022-03-14T11:38:27.529Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.529Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.529Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.530Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.530Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
<...>
[task 2022-03-14T11:38:27.573Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.574Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:227, x2:230, y1:12, y2:14, w:4, h:3}), window width: 1280 - 
[task 2022-03-14T11:38:27.574Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.574Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.574Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.574Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.574Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.575Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.576Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:203, x2:210, y1:26, y2:33, w:8, h:8}), window width: 1280 - 
[task 2022-03-14T11:38:27.576Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.576Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.576Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.576Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.576Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.577Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.578Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:227, x2:230, y1:45, y2:47, w:4, h:3}), window width: 1280 - 
[task 2022-03-14T11:38:27.578Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.578Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-14T11:38:27.578Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-14T11:38:27.578Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-14T11:38:27.578Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
<...>
[task 2022-03-14T11:38:27.690Z] 11:38:27     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-14T11:38:27.691Z] 11:38:27     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | should have 0 unknown flickering areas - Got 9, expected +0
[task 2022-03-14T11:38:27.691Z] 11:38:27     INFO - Stack trace:
[task 2022-03-14T11:38:27.691Z] 11:38:27     INFO - chrome://mochikit/content/browser-test.js:test_is:1422
[task 2022-03-14T11:38:27.691Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:650
[task 2022-03-14T11:38:27.691Z] 11:38:27     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-14T11:38:27.691Z] 11:38:27     INFO - Leaving test bound 
[task 2022-03-14T11:38:27.692Z] 11:38:27     INFO - GECKO(7004) | MEMORY STAT | vsize 2112664MB | vsizeMaxContiguous 65698490MB | residentFast 525MB | heapAllocated 330MB
[task 2022-03-14T11:38:27.692Z] 11:38:27     INFO - TEST-OK | browser/base/content/test/performance/browser_tabopen.js | took 793ms
[task 2022-03-14T11:38:27.693Z] 11:38:27     INFO - checking window state
[task 2022-03-14T11:38:27.693Z] 11:38:27     INFO - TEST-START | browser/base/content/test/performance/browser_tabopen_squeeze.js
```