Bug: Intermittent browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:203, x2:229, y1:12, y2:47, w:27, h:36}), window width: 1280 -
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-03-07 10:29:13+00:00
Resolved: 2022-04-05 17:04:14+00:00

**Filed by:** nfay [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=370182987&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/bqo0Fj5tRsCLvAceGZzTCQ/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-03-07T09:41:44.909Z] 09:41:44     INFO - TEST-START | browser/base/content/test/performance/browser_tabopen.js
[task 2022-03-07T09:41:45.481Z] 09:41:45     INFO - TEST-INFO | started process screenshot
[task 2022-03-07T09:41:45.612Z] 09:41:45     INFO - TEST-INFO | screenshot: exit 0
[task 2022-03-07T09:41:45.615Z] 09:41:45     INFO - Buffered messages logged at 09:41:44
[task 2022-03-07T09:41:45.615Z] 09:41:45     INFO - Entering test bound 
[task 2022-03-07T09:41:45.616Z] 09:41:45     INFO - tabStripRect={"x":0,"y":8,"width":1102,"height":44,"top":8,"right":1102,"bottom":52,"left":0}
[task 2022-03-07T09:41:45.617Z] 09:41:45     INFO - firstTabRect={"x":0,"y":8,"width":225,"height":44,"top":8,"right":225,"bottom":52,"left":0}
[task 2022-03-07T09:41:45.617Z] 09:41:45     INFO - tabPaddingStart=2
[task 2022-03-07T09:41:45.618Z] 09:41:45     INFO - firstTabLabelRect={"x":10,"y":19.800003051757812,"width":45,"height":20.399993896484375,"top":19.800003051757812,"right":55,"bottom":40.19999694824219,"left":10}
[task 2022-03-07T09:41:45.618Z] 09:41:45     INFO - newTabButtonRect={"x":225,"y":8,"width":40,"height":43,"top":8,"right":265,"bottom":51,"left":225}
[task 2022-03-07T09:41:45.619Z] 09:41:45     INFO - textBoxRect={"x":280,"y":58,"width":816,"height":28,"top":58,"right":1096,"bottom":86,"left":280}
[task 2022-03-07T09:41:45.619Z] 09:41:45     INFO - Buffered messages logged at 09:41:45
[task 2022-03-07T09:41:45.619Z] 09:41:45     INFO - TEST-PASS | browser/base/content/test/performance/browser_tabopen.js | 0 unexpected reflows - true == true - 
[task 2022-03-07T09:41:45.620Z] 09:41:45     INFO - comparing 6 frames
[task 2022-03-07T09:41:45.620Z] 09:41:45     INFO - Buffered messages finished
[task 2022-03-07T09:41:45.621Z] 09:41:45     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:203, x2:229, y1:12, y2:47, w:27, h:36}), window width: 1280 - 
[task 2022-03-07T09:41:45.621Z] 09:41:45     INFO - Stack trace:
[task 2022-03-07T09:41:45.621Z] 09:41:45     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-03-07T09:41:45.621Z] 09:41:45     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-03-07T09:41:45.621Z] 09:41:45     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-03-07T09:41:45.621Z] 09:41:45     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-07T09:41:45.667Z] 09:41:45     INFO - data:image/png;base64,iVBORw0KGg...
[task 2022-03-07T09:41:45.716Z] 09:41:45     INFO - data:image/png;base64,iVBORw0KGg...
[task 2022-03-07T09:41:45.796Z] 09:41:45     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-03-07T09:41:45.797Z] 09:41:45     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | should have 0 unknown flickering areas - Got 1, expected +0
[task 2022-03-07T09:41:45.798Z] 09:41:45     INFO - Stack trace:
[task 2022-03-07T09:41:45.798Z] 09:41:45     INFO - chrome://mochikit/content/browser-test.js:test_is:1422
[task 2022-03-07T09:41:45.798Z] 09:41:45     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:650
[task 2022-03-07T09:41:45.798Z] 09:41:45     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-03-07T09:41:45.806Z] 09:41:45     INFO - Leaving test bound 
[task 2022-03-07T09:41:45.826Z] 09:41:45     INFO - GECKO(2872) | MEMORY STAT | vsize 2113119MB | vsizeMaxContiguous 66537704MB | residentFast 895MB | heapAllocated 712MB
[task 2022-03-07T09:41:45.826Z] 09:41:45     INFO - TEST-OK | browser/base/content/test/performance/browser_tabopen.js | took 916ms
[task 2022-03-07T09:41:45.835Z] 09:41:45     INFO - checking window state
[task 2022-03-07T09:41:45.842Z] 09:41:45     INFO - TEST-START | browser/base/content/test/performance/browser_tabopen_squeeze.js
```