Filed by: dvarga [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=266624569&repo=mozilla-central
Full log: https://queue.taskcluster.net/v1/task/OFiB_rwETZ-50KeyMZYt1g/runs/0/artifacts/public/logs/live_backing.log

[task 2019-09-13T22:36:52.959Z] 22:36:52     INFO - TEST-PASS | devtools/client/netmonitor/test/browser_net_ws-early-connection.js | Request to reconfigure the tab was recorded. - 
[task 2019-09-13T22:36:52.959Z] 22:36:52     INFO - Clearing requests in the console client.
[task 2019-09-13T22:36:52.959Z] 22:36:52     INFO - Clearing requests in the UI.
[task 2019-09-13T22:36:52.959Z] 22:36:52     INFO - Starting test... 
[task 2019-09-13T22:36:52.960Z] 22:36:52     INFO - Buffered messages logged at 22:35:26
[task 2019-09-13T22:36:52.960Z] 22:36:52     INFO - Console message: [JavaScript Error: "uncaught exception: Object"]
[task 2019-09-13T22:36:52.960Z] 22:36:52     INFO - Console message: [JavaScript Error: "uncaught exception: Object"]
[task 2019-09-13T22:36:52.960Z] 22:36:52     INFO - Console message: [JavaScript Error: "uncaught exception: Object"]
[task 2019-09-13T22:36:52.960Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getResponseCookies: 'getResponseCookies' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.961Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getEventTimings: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.961Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getEventTimings: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.961Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getEventTimings: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.961Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getEventTimings: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.962Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getEventTimings: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.962Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getEventTimings: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.962Z] 22:36:52     INFO - Console message: [JavaScript Error: "Error: Error while calling method getRequestCookies: 'getRequestCookies' active request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed." {file: "resource://devtools/client/netmonitor/src/connector/firefox-data-provider.js" line: 620}]
[task 2019-09-13T22:36:52.963Z] 22:36:52     INFO - Buffered messages finished
[task 2019-09-13T22:36:52.963Z] 22:36:52     INFO - TEST-UNEXPECTED-FAIL | devtools/client/netmonitor/test/browser_net_ws-early-connection.js | Test timed out - 
[task 2019-09-13T22:36:53.527Z] 22:36:53     INFO - Removing tab.
[task 2019-09-13T22:36:53.528Z] 22:36:53     INFO - Waiting for event: 'TabClose' on [object XULElement].
[task 2019-09-13T22:36:53.549Z] 22:36:53     INFO - Got event: 'TabClose' on [object XULElement].
[task 2019-09-13T22:36:53.573Z] 22:36:53     INFO - Tab removed and finished closing
[task 2019-09-13T22:36:53.601Z] 22:36:53     INFO - finish() was called, cleaning up...
[task 2019-09-13T22:36:53.624Z] 22:36:53     INFO - Not taking screenshot here: see the one that was previously logged
[task 2019-09-13T22:36:53.624Z] 22:36:53     INFO - TEST-UNEXPECTED-FAIL | devtools/client/netmonitor/test/browser_net_ws-early-connection.js | A promise chain failed to handle a rejection: 'getResponseCookies' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed. - stack: listenerJson@resource://devtools/shared/client/debugger-client.js:341:17
[task 2019-09-13T22:36:53.625Z] 22:36:53     INFO - emit@resource://devtools/shared/event-emitter.js:190:24
[task 2019-09-13T22:36:53.626Z] 22:36:53     INFO - emit@resource://devtools/shared/event-emitter.js:271:18
[task 2019-09-13T22:36:53.626Z] 22:36:53     INFO - reject@resource://devtools/shared/client/debugger-client.js:815:15
[task 2019-09-13T22:36:53.626Z] 22:36:53     INFO - purgeRequests/<@resource://devtools/shared/client/debugger-client.js:826:54
[task 2019-09-13T22:36:53.627Z] 22:36:53     INFO - purgeRequests@resource://devtools/shared/client/debugger-client.js:826:29
[task 2019-09-13T22:36:53.627Z] 22:36:53     INFO - onClosed@resource://devtools/shared/client/debugger-client.js:762:10
[task 2019-09-13T22:36:53.627Z] 22:36:53     INFO - close@resource://devtools/shared/transport/local-transport.js:171:20
[task 2019-09-13T22:36:53.628Z] 22:36:53     INFO - close@resource://devtools/shared/transport/local-transport.js:167:13
[task 2019-09-13T22:36:53.628Z] 22:36:53     INFO - close@resource://devtools/shared/transport/local-transport.js:167:13
[task 2019-09-13T22:36:53.629Z] 22:36:53     INFO - cleanup@resource://devtools/shared/client/debugger-client.js:215:27
[task 2019-09-13T22:36:53.629Z] 22:36:53     INFO - close/promise<@resource://devtools/shared/client/debugger-client.js:231:7
[task 2019-09-13T22:36:53.629Z] 22:36:53     INFO - close@resource://devtools/shared/client/debugger-client.js:208:21
[task 2019-09-13T22:36:53.630Z] 22:36:53     INFO - TargetMixin/destroy/this._destroyer<@resource://devtools/shared/fronts/targets/target-mixin.js:457:32
[task 2019-09-13T22:36:53.630Z] 22:36:53     INFO - async*destroy@resource://devtools/shared/fronts/targets/target-mixin.js:480:9
[task 2019-09-13T22:36:53.630Z] 22:36:53     INFO - destroy@resource://devtools/shared/fronts/targets/browsing-context.js:148:27
[task 2019-09-13T22:36:53.630Z] 22:36:53     INFO - _destroyToolbox/onceDestroyed</<@resource://devtools/client/framework/toolbox.js:3637:27
[task 2019-09-13T22:36:53.631Z] 22:36:53     INFO - promise callback*_destroyToolbox/onceDestroyed<@resource://devtools/client/framework/toolbox.js:3594:12
[task 2019-09-13T22:36:53.631Z] 22:36:53     INFO - _destroyToolbox@resource://devtools/client/framework/toolbox.js:3590:27
[task 2019-09-13T22:36:53.632Z] 22:36:53     INFO - destroy@resource://devtools/client/framework/toolbox.js:3466:28
[task 2019-09-13T22:36:53.632Z] 22:36:53     INFO - _onRemotenessChange@resource://devtools/shared/fronts/targets/local-tab.js:131:19
[task 2019-09-13T22:36:53.633Z] 22:36:53     INFO - _handleTabEvent@resource://devtools/shared/fronts/targets/local-tab.js:109:14
[task 2019-09-13T22:36:53.633Z] 22:36:53     INFO - updateBrowserRemoteness@chrome://browser/content/tabbrowser.js:2046:11
[task 2019-09-13T22:36:53.634Z] 22:36:53     INFO - restoreTabContent@resource:///modules/sessionstore/SessionStore.jsm:4715:39
[task 2019-09-13T22:36:53.634Z] 22:36:53     INFO - restoreTab@resource:///modules/sessionstore/SessionStore.jsm:4630:14
[task 2019-09-13T22:36:53.634Z] 22:36:53     INFO - _asyncNavigateAndRestore@resource:///modules/sessionstore/SessionStore.jsm:3721:10
[task 2019-09-13T22:36:53.634Z] 22:36:53     INFO - async*navigateAndRestore@resource:///modules/sessionstore/SessionStore.jsm:3614:24
[task 2019-09-13T22:36:53.636Z] 22:36:53     INFO - navigateAndRestore@resource:///modules/sessionstore/SessionStore.jsm:403:33
[task 2019-09-13T22:36:53.636Z] 22:36:53     INFO - LoadInOtherProcess@chrome://browser/content/browser.js:1596:16
[task 2019-09-13T22:36:53.637Z] 22:36:53     INFO - _loadURI@chrome://browser/content/browser.js:1561:25
[task 2019-09-13T22:36:53.637Z] 22:36:53     INFO - loadURI@resource://testing-common/BrowserTestUtils.jsm:744:13
[task 2019-09-13T22:36:53.638Z] 22:36:53     INFO - @chrome://mochitests/content/browser/devtools/client/netmonitor/test/browser_net_ws-early-connection.js:32:20
[task 2019-09-13T22:36:53.639Z] 22:36:53     INFO - Async*Tester_execTest/<@chrome://mochikit/content/browser-test.js:1350:34
[task 2019-09-13T22:36:53.639Z] 22:36:53     INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:1385:11
[task 2019-09-13T22:36:53.640Z] 22:36:53     INFO - nextTest/<@chrome://mochikit/content/browser-test.js:1213:14
[task 2019-09-13T22:36:53.640Z] 22:36:53     INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:805:67
[task 2019-09-13T22:36:53.641Z] 22:36:53     INFO - Rejection date: Fri Sep 13 2019 22:35:26 GMT+0000 (Coordinated Universal Time) - false == true - JS frame :: resource://testing-common/PromiseTestUtils.jsm :: assertNoUncaughtRejections :: line 263
[task 2019-09-13T22:36:53.641Z] 22:36:53     INFO - Stack trace:
[task 2019-09-13T22:36:53.642Z] 22:36:53     INFO - resource://testing-common/PromiseTestUtils.jsm:assertNoUncaughtRejections:263
[task 2019-09-13T22:36:53.642Z] 22:36:53     INFO - chrome://mochikit/content/browser-test.js:nextTest:912
[task 2019-09-13T22:36:53.643Z] 22:36:53     INFO - chrome://mochikit/content/browser-test.js:timeoutFn:1471
[task 2019-09-13T22:36:53.643Z] 22:36:53     INFO - setTimeout handler*chrome://mochikit/content/browser-test.js:Tester_execTest:1418
[task 2019-09-13T22:36:53.644Z] 22:36:53     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1213
[task 2019-09-13T22:36:53.644Z] 22:36:53     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:805
[task 2019-09-13T22:36:53.661Z] 22:36:53     INFO - Not taking screenshot here: see the one that was previously logged
[task 2019-09-13T22:36:53.661Z] 22:36:53     INFO - TEST-UNEXPECTED-FAIL | devtools/client/netmonitor/test/browser_net_ws-early-connection.js | A promise chain failed to handle a rejection: 'getEventTimings' pending request packet to 'server0.conn152.netEvent4' can't be sent as the connection just closed. - stack: listenerJson@resource://devtools/shared/client/debugger-client.js:341:17

If you need any help with fission, maybe this could help: https://wiki.mozilla.org/Project_Fission/Enabling_Tests_with_Fission

Neha can we disable this?

Yes, fine to disable devtools mochitests for now.

https://hg.mozilla.org/mozilla-central/rev/ddc1f2bd74c0

Thanks for disabling this.
I filed a follow up bug 1583781 to fix the test for Fission

Honza

Retroactively moving fixed bugs whose summaries mention "Fission" (or other Fission-related keywords) but are not assigned to a Fission Milestone to an appropriate Fission Milestone.

This will generate a lot of bugmail, so you can filter your bugmail for the following UUID and delete them en masse:

0ee3c76a-bc79-4eb2-8d12-05dc0b68e732