Bug: Intermittent browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:203, x2:230, y1:4, y2:39, w:28, h:36}), window width: 1280 -
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-04-13 19:48:54+00:00
Resolved: 2022-05-10 17:03:15+00:00

**Filed by:** imoraru [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=374397455&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/YNZMIszVS4SZrEQzA_Ycow/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-04-13T19:14:34.700Z] 19:14:34     INFO - TEST-START | browser/base/content/test/performance/browser_tabopen.js
[task 2022-04-13T19:14:35.180Z] 19:14:35     INFO - TEST-INFO | started process screenshot
[task 2022-04-13T19:14:35.249Z] 19:14:35     INFO - TEST-INFO | screenshot: exit 0
[task 2022-04-13T19:14:35.257Z] 19:14:35     INFO - Buffered messages logged at 19:14:34
[task 2022-04-13T19:14:35.257Z] 19:14:35     INFO - Entering test bound 
[task 2022-04-13T19:14:35.258Z] 19:14:35     INFO - tabStripRect={"x":0,"y":0,"width":1102,"height":44,"top":0,"right":1102,"bottom":44,"left":0}
[task 2022-04-13T19:14:35.258Z] 19:14:35     INFO - firstTabRect={"x":0,"y":0,"width":225,"height":44,"top":0,"right":225,"bottom":44,"left":0}
[task 2022-04-13T19:14:35.259Z] 19:14:35     INFO - tabPaddingStart=2
[task 2022-04-13T19:14:35.259Z] 19:14:35     INFO - firstTabLabelRect={"x":10,"y":11.800003051757812,"width":45,"height":20.399993896484375,"top":11.800003051757812,"right":55,"bottom":32.19999694824219,"left":10}
[task 2022-04-13T19:14:35.260Z] 19:14:35     INFO - newTabButtonRect={"x":225,"y":0,"width":40,"height":43,"top":0,"right":265,"bottom":43,"left":225}
[task 2022-04-13T19:14:35.260Z] 19:14:35     INFO - textBoxRect={"x":280,"y":50,"width":816,"height":28,"top":50,"right":1096,"bottom":78,"left":280}
[task 2022-04-13T19:14:35.261Z] 19:14:35     INFO - Buffered messages logged at 19:14:35
[task 2022-04-13T19:14:35.261Z] 19:14:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_tabopen.js | 0 unexpected reflows - true == true - 
[task 2022-04-13T19:14:35.262Z] 19:14:35     INFO - comparing 6 frames
[task 2022-04-13T19:14:35.262Z] 19:14:35     INFO - Buffered messages finished
[task 2022-04-13T19:14:35.263Z] 19:14:35     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:203, x2:230, y1:4, y2:39, w:28, h:36}), window width: 1280 - 
[task 2022-04-13T19:14:35.263Z] 19:14:35     INFO - Stack trace:
[task 2022-04-13T19:14:35.263Z] 19:14:35     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-04-13T19:14:35.263Z] 19:14:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-04-13T19:14:35.263Z] 19:14:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-04-13T19:14:35.263Z] 19:14:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-04-13T19:14:35.307Z] 19:14:35     INFO - data:image/png;base64,i<...>
[task 2022-04-13T19:14:35.373Z] 19:14:35     INFO - data:image/png;base64,i<...>
[task 2022-04-13T19:14:35.481Z] 19:14:35     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-04-13T19:14:35.483Z] 19:14:35     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | should have 0 unknown flickering areas - Got 1, expected +0
[task 2022-04-13T19:14:35.483Z] 19:14:35     INFO - Stack trace:
[task 2022-04-13T19:14:35.483Z] 19:14:35     INFO - chrome://mochikit/content/browser-test.js:test_is:1422
[task 2022-04-13T19:14:35.483Z] 19:14:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:650
[task 2022-04-13T19:14:35.483Z] 19:14:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-04-13T19:14:35.485Z] 19:14:35     INFO - Leaving test bound 
[task 2022-04-13T19:14:35.504Z] 19:14:35     INFO - GECKO(6844) | MEMORY STAT | vsize 2112915MB | vsizeMaxContiguous 66214240MB | residentFast 812MB | heapAllocated 629MB
[task 2022-04-13T19:14:35.511Z] 19:14:35     INFO - TEST-OK | browser/base/content/test/performance/browser_tabopen.js | took 810ms
[task 2022-04-13T19:14:35.520Z] 19:14:35     INFO - checking window state
[task 2022-04-13T19:14:35.528Z] 19:14:35     INFO - TEST-START | browser/base/content/test/performance/browser_tabopen_squeeze.js
```