Bug: Intermittent TEST-UNEXPECTED-TIMEOUT | browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js | application timed out after 370 seconds with no output
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2021-06-04 17:09:03+00:00
Resolved: 2021-06-29 17:01:50+00:00

**Filed by:** smolnar [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=341775684&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/a34rFhjKSWa0NFRjSG1-JA/runs/0/artifacts/public/logs/live_backing.log

---
```
INFO - TEST-START | browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js
[task 2021-06-04T16:09:33.412Z] 16:09:33     INFO - GECKO(1581) | console.log: [bug 1345098] Lazy browser prematurely inserted via 'messageManager' property access:
[task 2021-06-04T16:09:33.412Z] 16:09:33     INFO - GECKO(1581) | getter@chrome://browser/content/tabbrowser.js:2273:39
[task 2021-06-04T16:09:33.412Z] 16:09:33     INFO - GECKO(1581) | flush@resource:///modules/sessionstore/TabStateFlusher.jsm:130:16
[task 2021-06-04T16:09:33.412Z] 16:09:33     INFO - GECKO(1581) | flush@resource:///modules/sessionstore/TabStateFlusher.jsm:34:36
[task 2021-06-04T16:09:33.412Z] 16:09:33     INFO - GECKO(1581) | test_scroll_background_about_reader_tabs@chrome://mochitests/content/browser/browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js:60:25
[task 2021-06-04T16:16:09.113Z] 16:16:07     INFO - Buffered messages logged at 16:09:03
[task 2021-06-04T16:16:35.799Z] 16:16:34     INFO - Entering test bound test_scroll_background_about_reader_tabs
[task 2021-06-04T16:16:56.283Z] 16:16:54     INFO - Buffered messages logged at 16:09:30
[task 2021-06-04T16:17:24.491Z] 16:17:23     INFO - Console message: [JavaScript Error: "Not a string"]
[task 2021-06-04T16:17:42.793Z] 16:17:41     INFO - Console message: [JavaScript Error: "Not a string"]
[task 2021-06-04T16:18:03.080Z] 16:18:02     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js | scroll is fine - 
[task 2021-06-04T16:18:23.202Z] 16:18:22     INFO - Buffered messages logged at 16:09:33
[task 2021-06-04T16:18:48.961Z] 16:18:47     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js | There should be two tabs - 
[task 2021-06-04T16:19:25.219Z] 16:19:23     INFO - TEST-PASS | browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js | Tab should be pending - 
[task 2021-06-04T16:19:48.863Z] 16:19:46     INFO - Buffered messages finished
[task 2021-06-04T16:20:09.285Z] 16:20:07    ERROR - TEST-UNEXPECTED-TIMEOUT | browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js | application timed out after 370 seconds with no output
[task 2021-06-04T16:20:20.527Z] 16:20:19    ERROR - Force-terminating active process(es).
[task 2021-06-04T16:20:36.376Z] 16:20:35     INFO - Determining child pids from psutil...
[task 2021-06-04T16:27:50.997Z] 16:27:50     INFO - [1647, 1671, 1726, 1766, 1800, 1831, 1919, 1951, 2062, 2167, 2194]
[task 2021-06-04T16:27:51.041Z] 16:27:51     INFO - ==> process 1581 launched child process 1596
[task 2021-06-04T16:27:51.041Z] 16:27:51     INFO - ==> process 1581 launched child process 1647
[task 2021-06-04T16:27:51.041Z] 16:27:51     INFO - ==> process 1581 launched child process 1671
[task 2021-06-04T16:27:51.041Z] 16:27:51     INFO - ==> process 1581 launched child process 1726
[task 2021-06-04T16:27:51.041Z] 16:27:51     INFO - ==> process 1581 launched child process 1766
[task 2021-06-04T16:27:51.041Z] 16:27:51     INFO - ==> process 1581 launched child process 1800
[task 2021-06-04T16:27:51.042Z] 16:27:51     INFO - ==> process 1581 launched child process 1831
[task 2021-06-04T16:27:51.042Z] 16:27:51     INFO - ==> process 1581 launched child process 1919
[task 2021-06-04T16:27:51.042Z] 16:27:51     INFO - ==> process 1581 launched child process 2062
[task 2021-06-04T16:27:51.042Z] 16:27:51     INFO - ==> process 1581 launched child process 2167
[task 2021-06-04T16:27:51.042Z] 16:27:51     INFO - ==> process 1581 launched child process 2194
[task 2021-06-04T16:27:51.042Z] 16:27:51     INFO - Found child pids: {1766, 1671, 1800, 1831, 2062, 1647, 2194, 2167, 1951, 1596, 1726, 1919}
[task 2021-06-04T16:27:51.454Z] 16:27:51     INFO - Failed to get child procs
[task 2021-06-04T16:27:51.482Z] 16:27:51     INFO - Killing process: 1766
INFO - TEST-INFO | started process screentopng
[task 2021-06-04T16:37:08.619Z] 16:37:08     INFO - TEST-INFO | screentopng: exit 0
[task 2021-06-04T16:37:08.649Z] 16:37:08     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:37:38.840Z] 16:37:38     INFO - failed to kill pid 1766 after 30s
[task 2021-06-04T16:37:38.841Z] 16:37:38     INFO - Killing process: 1671
[task 2021-06-04T16:37:38.841Z] 16:37:38     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:37:38.841Z] 16:37:38     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:38:08.877Z] 16:38:08     INFO - failed to kill pid 1671 after 30s
[task 2021-06-04T16:38:08.878Z] 16:38:08     INFO - Killing process: 1800
[task 2021-06-04T16:38:08.878Z] 16:38:08     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:38:08.878Z] 16:38:08     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:38:38.913Z] 16:38:38     INFO - failed to kill pid 1800 after 30s
[task 2021-06-04T16:38:38.915Z] 16:38:38     INFO - Killing process: 1831
[task 2021-06-04T16:38:38.915Z] 16:38:38     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:38:38.916Z] 16:38:38     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:39:08.943Z] 16:39:08     INFO - failed to kill pid 1831 after 30s
[task 2021-06-04T16:39:08.944Z] 16:39:08     INFO - Killing process: 2062
[task 2021-06-04T16:39:08.944Z] 16:39:08     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:39:08.945Z] 16:39:08     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:39:21.333Z] 16:39:21     INFO - psutil found pid 2062 dead
[task 2021-06-04T16:39:21.335Z] 16:39:21     INFO - Killing process: 1647
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Error: Failed to kill process 1647: psutil.NoSuchProcess no process found with pid 1647
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Killing process: 2194
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Error: Failed to kill process 2194: psutil.NoSuchProcess no process found with pid 2194
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Killing process: 2167
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:39:21.336Z] 16:39:21     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:39:21.337Z] 16:39:21     INFO - Error: Failed to kill process 2167: psutil.NoSuchProcess no process found with pid 2167
[task 2021-06-04T16:39:21.337Z] 16:39:21     INFO - Killing process: 1951
[task 2021-06-04T16:39:21.337Z] 16:39:21     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:39:21.337Z] 16:39:21     INFO - Can't trigger Breakpad, just killing process
[task 2021-06-04T16:39:51.345Z] 16:39:51     INFO - failed to kill pid 1951 after 30s
[task 2021-06-04T16:39:51.347Z] 16:39:51     INFO - Killing process: 1596
[task 2021-06-04T16:39:51.347Z] 16:39:51     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-06-04T16:39:51.347Z] 16:39:51     INFO - Can't trigger Breakpad, just killing process
<....>
```