Bug: Intermittent browser_687710_2.js | Uncaught exception - at chrome://mochitests/content/browser/browser/components/sessionstore/test/browser_687710_2.js:62 - TypeError: can't access property "legacySHistory", docShell.sessionHistory is undefined
Status: RESOLVED
Priority: P3
Resolution: WORKSFORME
Created: 2020-09-17 11:07:43+00:00
Resolved: 2020-11-12 15:31:11+00:00

**Filed by:** btara [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer.html#?job_id=315925062&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/aiJFfFbbQ7WaSn-aG5GbMw/runs/0/artifacts/public/logs/live_backing.log

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```
[task 2020-09-17T09:50:04.253Z] 09:50:04     INFO - TEST-START | browser/components/sessionstore/test/browser_687710_2.js
[task 2020-09-17T09:50:04.752Z] 09:50:04     INFO - TEST-INFO | started process screenshot
[task 2020-09-17T09:50:04.835Z] 09:50:04     INFO - TEST-INFO | screenshot: exit 0
[task 2020-09-17T09:50:04.835Z] 09:50:04     INFO - Buffered messages logged at 09:50:04
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - Entering test bound test
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - Buffered messages finished
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - TEST-UNEXPECTED-FAIL | browser/components/sessionstore/test/browser_687710_2.js | Uncaught exception - at chrome://mochitests/content/browser/browser/components/sessionstore/test/browser_687710_2.js:62 - TypeError: can't access property "legacySHistory", docShell.sessionHistory is undefined
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - Stack trace:
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - @chrome://mochitests/content/browser/browser/components/sessionstore/test/browser_687710_2.js:62:21
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - execute@resource://specialpowers/SpecialPowersSandbox.jsm:141:12
[task 2020-09-17T09:50:04.836Z] 09:50:04     INFO - _spawnTask@resource://specialpowers/SpecialPowersChild.jsm:1617:15
[task 2020-09-17T09:50:04.837Z] 09:50:04     INFO - receiveMessage@resource://specialpowers/SpecialPowersChild.jsm:310:21
[task 2020-09-17T09:50:04.837Z] 09:50:04     INFO - Leaving test bound test
[task 2020-09-17T09:50:04.837Z] 09:50:04     INFO - GECKO(4324) | MEMORY STAT | vsize 2104761MB | vsizeMaxContiguous 65335718MB | residentFast 762MB | heapAllocated 451MB
[task 2020-09-17T09:50:04.837Z] 09:50:04     INFO - TEST-OK | browser/components/sessionstore/test/browser_687710_2.js | took 550ms
[task 2020-09-17T09:50:04.837Z] 09:50:04     INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-09-17T09:50:04.837Z] 09:50:04     INFO - TEST-UNEXPECTED-FAIL | browser/components/sessionstore/test/browser_687710_2.js | Found an unexpected tab at the end of test run: http://example.com/?1#a - 
[task 2020-09-17T09:50:04.838Z] 09:50:04     INFO - checking window state
[task 2020-09-17T09:50:04.864Z] 09:50:04     INFO - TEST-START | browser/components/sessionstore/test/browser_694378.js
[task 2020-09-17T09:50:05.064Z] 09:50:05     INFO - GECKO(4324) | MEMORY STAT | vsize 2104725MB | vsizeMaxContiguous 65335718MB | residentFast 745MB | heapAllocated 432MB
[task 2020-09-17T09:50:05.064Z] 09:50:05     INFO - TEST-OK | browser/components/sessionstore/test/browser_694378.js | took 193ms
``````