Bug: Permafailing browser_tabCloseProbes.js | Uncaught exception - at test/tabs/browser_tabCloseProbes.js:21 - TypeError: can't access property "values", snapshot is undefined when Gecko version increases to 76 on 2020-03-09
Status: VERIFIED
Priority: P2
Resolution: FIXED
Created: 2020-02-18 11:07:51+00:00
Resolved: 2020-06-09 14:16:49+00:00

[Tracking Requested - why for this release]:
**Version increase simulation:** https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=85bec4ee2a5eb84bbd3842824589f306681e11de&searchStr=browser-chrome&selectedJob=289320215

*Failure log:* https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=289320215&repo=try&lineNumber=3161

>[task 2020-02-18T10:33:44.654Z] 10:33:44     INFO - TEST-START | browser/base/content/test/tabs/browser_tabCloseProbes.js
[task 2020-02-18T10:33:45.339Z] 10:33:45     INFO - TEST-INFO | started process screentopng
[task 2020-02-18T10:33:45.861Z] 10:33:45     INFO - TEST-INFO | screentopng: exit 0
[task 2020-02-18T10:33:45.862Z] 10:33:45     INFO - Buffered messages logged at 10:33:44
[task 2020-02-18T10:33:45.862Z] 10:33:45     INFO - Entering test bound setup
[task 2020-02-18T10:33:45.863Z] 10:33:45     INFO - Leaving test bound setup
[task 2020-02-18T10:33:45.863Z] 10:33:45     INFO - Entering test bound test_close_time_anim_probe
[task 2020-02-18T10:33:45.864Z] 10:33:45     INFO - Buffered messages finished
[task 2020-02-18T10:33:45.865Z] 10:33:45     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/tabs/browser_tabCloseProbes.js | Uncaught exception - at chrome://mochitests/content/browser/browser/base/content/test/tabs/browser_tabCloseProbes.js:21 - TypeError: can't access property "values", snapshot is undefined
[task 2020-02-18T10:33:45.865Z] 10:33:45     INFO - Stack trace:
[task 2020-02-18T10:33:45.865Z] 10:33:45     INFO - snapshotCount@chrome://mochitests/content/browser/browser/base/content/test/tabs/browser_tabCloseProbes.js:21:3
[task 2020-02-18T10:33:45.865Z] 10:33:45     INFO - assertCount@chrome://mochitests/content/browser/browser/base/content/test/tabs/browser_tabCloseProbes.js:38:5
[task 2020-02-18T10:33:45.865Z] 10:33:45     INFO - test_close_time_anim_probe@chrome://mochitests/content/browser/browser/base/content/test/tabs/browser_tabCloseProbes.js:85:14
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - Async*Tester_execTest/<@chrome://mochikit/content/browser-test.js:1062:34
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - async*Tester_execTest@chrome://mochikit/content/browser-test.js:1097:11
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - nextTest/<@chrome://mochikit/content/browser-test.js:925:14
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:914:23
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - Leaving test bound test_close_time_anim_probe
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - Entering test bound test_close_time_no_anim_probe
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) | -----------------------------------------------------
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) | Suppressions used:
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) |   count      bytes template
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) |      27        832 nsComponentManagerImpl
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) |     611      17713 libfontconfig.so
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) |       1         29 libglib-2.0.so
[task 2020-02-18T10:33:45.866Z] 10:33:45     INFO - GECKO(2326) | -----------------------------------------------------
[task 2020-02-18T10:33:45.921Z] 10:33:45     INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-02-18T10:33:45.922Z] 10:33:45     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/tabs/browser_tabCloseProbes.js | Uncaught exception - Collected value should become 1. - threw exception: TypeError: can't access property "values", snapshot is undefined
[task 2020-02-18T10:33:45.922Z] 10:33:45     INFO - Leaving test bound test_close_time_no_anim_probe
[task 2020-02-18T10:33:45.942Z] 10:33:45     INFO - GECKO(2326) | MEMORY STAT | vsize 20975731MB | residentFast 1360MB
[task 2020-02-18T10:33:45.944Z] 10:33:45     INFO - TEST-OK | browser/base/content/test/tabs/browser_tabCloseProbes.js | took 1282ms