Bug: Intermittent [tier 2] browser/base/content/test/zoom/browser_mousewheel_zoom.js | Found an unexpected tab at the end of test run: http://example.org/browser/browser/base/content/test/zoom/zoom_test.html - | after undefined - timed out after 50 tries. -
Status: RESOLVED
Priority: P5
Resolution: DUPLICATE
Created: 2021-08-04 03:08:49+00:00
Resolved: 2021-09-06 06:02:15+00:00

**Filed by:** mlaza [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=347325535&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/c4JL4N21QY6Ve1Eq-yLc7Q/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2021-08-04T01:53:32.453Z] 01:53:32     INFO - TEST-START | browser/base/content/test/zoom/browser_mousewheel_zoom.js
[task 2021-08-04T01:53:32.852Z] 01:53:32     INFO - GECKO(1792) | console.info: Wait tab event: load
[task 2021-08-04T01:53:32.853Z] 01:53:32     INFO - GECKO(1792) | console.info: Expecting load for:  http://example.org/browser/browser/base/content/test/zoom/zoom_test.html
[task 2021-08-04T01:53:32.878Z] 01:53:32     INFO - GECKO(1792) | console.info: Tab event received: load
[task 2021-08-04T01:53:32.878Z] 01:53:32     INFO - GECKO(1792) | console.info: Wait tab event: load
[task 2021-08-04T01:53:32.879Z] 01:53:32     INFO - GECKO(1792) | console.info: Expecting load for:  http://example.org/browser/browser/base/content/test/zoom/zoom_test.html
[task 2021-08-04T01:53:32.892Z] 01:53:32     INFO - GECKO(1792) | console.info: Tab event received: load
[task 2021-08-04T01:53:41.342Z] 01:53:41     INFO - TEST-INFO | started process screencapture
[task 2021-08-04T01:53:41.462Z] 01:53:41     INFO - TEST-INFO | screencapture: exit 0
[task 2021-08-04T01:53:41.463Z] 01:53:41     INFO - Buffered messages logged at 01:53:32
[task 2021-08-04T01:53:41.463Z] 01:53:41     INFO - Console message: [JavaScript Error: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." {file: "http://example.org/browser/browser/base/content/test/zoom/zoom_test.html" line: 0}]
[task 2021-08-04T01:53:41.464Z] 01:53:41     INFO - Console message: [JavaScript Error: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." {file: "http://example.org/browser/browser/base/content/test/zoom/zoom_test.html" line: 0}]
[task 2021-08-04T01:53:41.465Z] 01:53:41     INFO - TEST-PASS | browser/base/content/test/zoom/browser_mousewheel_zoom.js | Tab 1 is selected - 
[task 2021-08-04T01:53:41.465Z] 01:53:41     INFO - TEST-PASS | browser/base/content/test/zoom/browser_mousewheel_zoom.js | Initial zoom of tab 1 should be 1 - 
[task 2021-08-04T01:53:41.466Z] 01:53:41     INFO - TEST-PASS | browser/base/content/test/zoom/browser_mousewheel_zoom.js | Initial zoom of tab 2 should be 1 - 
[task 2021-08-04T01:53:41.466Z] 01:53:41     INFO - Waiting for tab 1 to be zoomed
[task 2021-08-04T01:53:41.466Z] 01:53:41     INFO - Buffered messages finished
[task 2021-08-04T01:53:41.467Z] 01:53:41     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/zoom/browser_mousewheel_zoom.js | undefined - timed out after 50 tries. - 
[task 2021-08-04T01:53:41.467Z] 01:53:41     INFO - Stack trace:
[task 2021-08-04T01:53:41.467Z] 01:53:41     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T01:53:41.467Z] 01:53:41     INFO - chrome://mochitests/content/browser/browser/base/content/test/zoom/head.js:failAndContinue/<:186
[task 2021-08-04T01:53:41.468Z] 01:53:41     INFO - Console message: [JavaScript Error: "undefined - timed out after 50 tries." {file: "chrome://mochitests/content/browser/browser/base/content/test/zoom/head.js" line: 185}]
[task 2021-08-04T01:53:41.468Z] 01:53:41     INFO - failAndContinue/<@chrome://mochitests/content/browser/browser/base/content/test/zoom/head.js:185:10
[task 2021-08-04T01:53:41.468Z] 01:53:41     INFO - 
[task 2021-08-04T01:53:41.468Z] 01:53:41     INFO - GECKO(1792) | MEMORY STAT | vsize 7828MB | residentFast 282MB | heapAllocated 96MB
[task 2021-08-04T01:53:41.468Z] 01:53:41     INFO - TEST-OK | browser/base/content/test/zoom/browser_mousewheel_zoom.js | took 8893ms
[task 2021-08-04T01:53:41.469Z] 01:53:41     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T01:53:41.469Z] 01:53:41     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/zoom/browser_mousewheel_zoom.js | Found an unexpected tab at the end of test run: http://example.org/browser/browser/base/content/test/zoom/zoom_test.html - 
[task 2021-08-04T01:53:41.469Z] 01:53:41     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T01:53:41.470Z] 01:53:41     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/zoom/browser_mousewheel_zoom.js | Found an unexpected tab at the end of test run: http://example.org/browser/browser/base/content/test/zoom/zoom_test.html - 
[task 2021-08-04T01:53:41.470Z] 01:53:41     INFO - checking window state
```