Bug: Intermittent browser/base/content/test/performance/browser_tabclose.js | unexpected changed rect: ({x1:203, x2:210, y1:18, y2:25, w:8, h:8}), window width: 1280 -
Status: RESOLVED
Priority: P5
Resolution: DUPLICATE
Created: 2022-01-18 14:42:14+00:00
Resolved: 2022-08-12 20:33:08+00:00

**Filed by:** ccozmuta [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=364484151&repo=try
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/OpBTe-snT6aFrckgzJqnZw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-01-18T12:49:51.179Z] 12:49:51     INFO - TEST-START | browser/base/content/test/performance/browser_tabclose.js
[task 2022-01-18T12:49:52.007Z] 12:49:52     INFO - TEST-INFO | started process screentopng
[task 2022-01-18T12:49:52.240Z] 12:49:52     INFO - TEST-INFO | screentopng: exit 0
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - Buffered messages logged at 12:49:51
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - Entering test bound 
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - TEST-PASS | browser/base/content/test/performance/browser_tabclose.js | 0 unexpected reflows - true == true - 
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - comparing 3 frames
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - Buffered messages finished
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabclose.js | unexpected changed rect: ({x1:203, x2:210, y1:18, y2:25, w:8, h:8}), window width: 1280 - 
[task 2022-01-18T12:49:52.241Z] 12:49:52     INFO - Stack trace:
[task 2022-01-18T12:49:52.242Z] 12:49:52     INFO - chrome://mochikit/content/browser-test.js:test_ok:1375
[task 2022-01-18T12:49:52.242Z] 12:49:52     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-01-18T12:49:52.242Z] 12:49:52     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-01-18T12:49:52.242Z] 12:49:52     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
<...>
[task 2022-01-18T12:49:52.543Z] 12:49:52     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-01-18T12:49:52.547Z] 12:49:52     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabclose.js | should have 0 unknown flickering areas - Got 1, expected +0
[task 2022-01-18T12:49:52.548Z] 12:49:52     INFO - Stack trace:
[task 2022-01-18T12:49:52.549Z] 12:49:52     INFO - chrome://mochikit/content/browser-test.js:test_is:1403
[task 2022-01-18T12:49:52.550Z] 12:49:52     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:650
[task 2022-01-18T12:49:52.551Z] 12:49:52     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-01-18T12:49:52.552Z] 12:49:52     INFO - TEST-PASS | browser/base/content/test/performance/browser_tabclose.js | No reflows are expected when closing a tab - 
[task 2022-01-18T12:49:52.561Z] 12:49:52     INFO - Leaving test bound 
[task 2022-01-18T12:49:52.562Z] 12:49:52     INFO - GECKO(3121) | MEMORY STAT | vsize 11472MB | residentFast 532MB | heapAllocated 294MB
[task 2022-01-18T12:49:52.564Z] 12:49:52     INFO - TEST-OK | browser/base/content/test/performance/browser_tabclose.js | took 1101ms
[task 2022-01-18T12:49:52.565Z] 12:49:52     INFO - checking window state
[task 2022-01-18T12:49:52.566Z] 12:49:52     INFO - TEST-START | browser/base/content/test/performance/browser_tabclose_grow.js
```