Bug: Intermittent TEST-UNEXPECTED-TIMEOUT | browser/components/sessionstore/test/browser_tab_label_during_restore.js | application timed out after 370 seconds with no output
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2021-02-23 09:59:51+00:00
Resolved: 2021-05-11 17:01:21+00:00

**Filed by:** btara [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=330871967&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/YFHchrDoS2KVhJNy3qA2JA/runs/0/artifacts/public/logs/live_backing.log

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```
[task 2021-02-23T09:24:53.151Z] 09:24:53     INFO - TEST-START | browser/components/sessionstore/test/browser_tab_label_during_restore.js
[task 2021-02-23T09:31:07.171Z] 09:31:07     INFO - Buffered messages logged at 09:24:53
[task 2021-02-23T09:31:07.171Z] 09:31:07     INFO - Entering test bound 
[task 2021-02-23T09:31:07.171Z] 09:31:07     INFO - setting test browser state
[task 2021-02-23T09:31:07.171Z] 09:31:07     INFO - Buffered messages logged at 09:24:54
[task 2021-02-23T09:31:07.171Z] 09:31:07     INFO - running 
[task 2021-02-23T09:31:07.172Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | first tab is selected - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | correct URL loaded in first tab - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | content title is a string - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | content title isn't empty - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | content title is different from the URL - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | first tab displays content title - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | title bar displays content title - 
[task 2021-02-23T09:31:07.173Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | second tab is pending - 
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | third tab is pending - 
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | fourth tab is pending - 
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | fifth tab dislpays empty tab title - 
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - selecting the second tab
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - Buffered messages logged at 09:24:55
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | second tab isn't pending anymore - 
[task 2021-02-23T09:31:07.174Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | observed tab label changes - 
[task 2021-02-23T09:31:07.175Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | title bar displays content title - 
[task 2021-02-23T09:31:07.175Z] 09:31:07     INFO - selecting the third tab
[task 2021-02-23T09:31:07.175Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | third tab isn't pending anymore - 
[task 2021-02-23T09:31:07.175Z] 09:31:07     INFO - Buffered messages logged at 09:24:56
[task 2021-02-23T09:31:07.176Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | observed tab label changes - 
[task 2021-02-23T09:31:07.176Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | title bar displays content title - 
[task 2021-02-23T09:31:07.176Z] 09:31:07     INFO - selecting the fourth tab
[task 2021-02-23T09:31:07.176Z] 09:31:07     INFO - Buffered messages logged at 09:24:57
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | fourth tab isn't pending anymore - 
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - Console message: [JavaScript Error: "The character encoding of the plain text 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 file needs to be declared in the transfer protocol or file needs to use a byte order mark as an encoding signature." {file: "data:text/plain,foo" line: 0}]
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | observed tab label changes - 
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - TEST-PASS | browser/components/sessionstore/test/browser_tab_label_during_restore.js | title bar doesn't display content title since page doesn't have one - 
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - restoring the modified browser state
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - Buffered messages finished
[task 2021-02-23T09:31:07.177Z] 09:31:07    ERROR - TEST-UNEXPECTED-TIMEOUT | browser/components/sessionstore/test/browser_tab_label_during_restore.js | application timed out after 370 seconds with no output
[task 2021-02-23T09:31:07.177Z] 09:31:07    ERROR - Force-terminating active process(es).
[task 2021-02-23T09:31:07.177Z] 09:31:07     INFO - Determining child pids from psutil...
[task 2021-02-23T09:31:07.185Z] 09:31:07     INFO - [1635, 1659, 1718, 1748, 1818, 1956, 1783]
[task 2021-02-23T09:31:07.185Z] 09:31:07     INFO - ==> process 1570 launched child process 1585
[task 2021-02-23T09:31:07.185Z] 09:31:07     INFO - ==> process 1570 launched child process 1635
[task 2021-02-23T09:31:07.185Z] 09:31:07     INFO - ==> process 1570 launched child process 1659
[task 2021-02-23T09:31:07.185Z] 09:31:07     INFO - ==> process 1570 launched child process 1718
[task 2021-02-23T09:31:07.186Z] 09:31:07     INFO - ==> process 1570 launched child process 1748
[task 2021-02-23T09:31:07.186Z] 09:31:07     INFO - ==> process 1570 launched child process 1783
[task 2021-02-23T09:31:07.186Z] 09:31:07     INFO - ==> process 1570 launched child process 1818
[task 2021-02-23T09:31:07.187Z] 09:31:07     INFO - Found child pids: set([1635, 1956, 1585, 1748, 1718, 1783, 1818, 1659])
[task 2021-02-23T09:31:07.187Z] 09:31:07     INFO - Failed to get child procs
[task 2021-02-23T09:31:07.188Z] 09:31:07     INFO - Killing process: 1635
[task 2021-02-23T09:31:07.189Z] 09:31:07     INFO - TEST-INFO | started process screentopng
[task 2021-02-23T09:31:07.549Z] 09:31:07     INFO - TEST-INFO | screentopng: exit 0```