Filed by: apavel [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=247551199&repo=autoland
Full log: https://queue.taskcluster.net/v1/task/TkonCgOeTMeQa7DcrwZz7Q/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://queue.taskcluster.net/v1/task/TkonCgOeTMeQa7DcrwZz7Q/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2019-05-21T13:50:20.726Z] 13:50:20 INFO - TEST-START | browser/components/aboutlogins/tests/browser/browser_masterPassword.js
[task 2019-05-21T13:50:20.731Z] 13:50:20 INFO - GECKO(2797) | Chrome file doesn't exist: /builds/worker/workspace/build/tests/mochitest/browser/browser/components/aboutlogins/tests/browser/head.js
[task 2019-05-21T13:50:20.749Z] 13:50:20 INFO - GECKO(2797) | [Child 2994, Main Thread] WARNING: No active window: file /builds/worker/workspace/build/src/js/xpconnect/src/XPCJSContext.cpp, line 662

[task 2019-05-21T13:51:51.411Z] 13:51:51 INFO - TEST-PASS | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | Dialog is the Master Password dialog -
[task 2019-05-21T13:51:51.411Z] 13:51:51 INFO - Console message: [JavaScript Error: "NS_ERROR_ABORT: User canceled master password entry" {file: "resource://gre/modules/crypto-SDR.js" line: 179}]
[task 2019-05-21T13:51:51.411Z] 13:51:51 INFO - Console message: [JavaScript Error: "NS_ERROR_ABORT: User canceled master password entry" {file: "resource://gre/modules/crypto-SDR.js" line: 179}]
[task 2019-05-21T13:51:51.411Z] 13:51:51 INFO - Console message: [JavaScript Error: "NS_ERROR_ABORT: User canceled master password entry" {file: "resource://gre/modules/crypto-SDR.js" line: 179}]
[task 2019-05-21T13:51:51.416Z] 13:51:51 INFO - Console message: [JavaScript Error: "[Exception... "User canceled master password entry" nsresult: "0x80004004 (NS_ERROR_ABORT)" location: "JS frame :: resource://gre/modules/crypto-SDR.js :: decrypt :: line 179" data: no]"]
[task 2019-05-21T13:51:51.416Z] 13:51:51 INFO - decrypt@resource://gre/modules/crypto-SDR.js:179:26
[task 2019-05-21T13:51:51.416Z] 13:51:51 INFO - _decryptLogins@resource://gre/modules/storage-json.js:518:39
[task 2019-05-21T13:51:51.416Z] 13:51:51 INFO - getAllLogins@resource://gre/modules/storage-json.js:255:19
[task 2019-05-21T13:51:51.416Z] 13:51:51 INFO - getAllLogins@resource://gre/modules/LoginManager.jsm:330:26
[task 2019-05-21T13:51:51.417Z] 13:51:51 INFO - getAllLogins@resource:///modules/AboutLoginsParent.jsm:233:21
[task 2019-05-21T13:51:51.417Z] 13:51:51 INFO - receiveMessage@resource:///modules/AboutLoginsParent.jsm:88:71
[task 2019-05-21T13:51:51.418Z] 13:51:51 INFO - receiveMessage@resource:///modules/BrowserGlue.jsm:595:30
[task 2019-05-21T13:51:51.418Z] 13:51:51 INFO - MessageListener.receiveMessage*init@resource:///modules/BrowserGlue.jsm:610:19
[task 2019-05-21T13:51:51.418Z] 13:51:51 INFO - BG__beforeUIStartup@resource:///modules/BrowserGlue.jsm:1079:15
[task 2019-05-21T13:51:51.420Z] 13:51:51 INFO - BG_observe@resource:///modules/BrowserGlue.jsm:763:14
[task 2019-05-21T13:51:51.421Z] 13:51:51 INFO -
[task 2019-05-21T13:51:51.422Z] 13:51:51 INFO - TEST-PASS | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | No logins should be displayed when MP is set and unauthenticated -
[task 2019-05-21T13:51:51.422Z] 13:51:51 INFO - TEST-PASS | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | master-password-login-required notification should be visible -
[task 2019-05-21T13:51:51.428Z] 13:51:51 INFO - TEST-PASS | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | Should have one button. -
[task 2019-05-21T13:51:51.428Z] 13:51:51 INFO - Buffered messages logged at 13:50:22
[task 2019-05-21T13:51:51.429Z] 13:51:51 INFO - TEST-PASS | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | Dialog is the Master Password dialog -
[task 2019-05-21T13:51:51.429Z] 13:51:51 INFO - Page reloaded
[task 2019-05-21T13:51:51.429Z] 13:51:51 INFO - Buffered messages finished
[task 2019-05-21T13:51:51.430Z] 13:51:51 INFO - TEST-UNEXPECTED-FAIL | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | Test timed out -
[task 2019-05-21T13:51:51.430Z] 13:51:51 INFO - GECKO(2797) | MP change from omgsecret! to
[task 2019-05-21T13:51:51.432Z] 13:51:51 INFO - GECKO(2797) | [Child 2994, Main Thread] WARNING: No active window: file /builds/worker/workspace/build/src/js/xpconnect/src/XPCJSContext.cpp, line 662
[task 2019-05-21T13:51:51.432Z] 13:51:51 INFO - GECKO(2797) | MEMORY STAT | vsize 2926MB | residentFast 279MB | heapAllocated 75MB
[task 2019-05-21T13:51:51.436Z] 13:51:51 INFO - TEST-OK | browser/components/aboutlogins/tests/browser/browser_masterPassword.js | took 90440ms

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup