Filed by: csabou [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=337341540&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/edtu2J_US-KkHQfAsobT5Q/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://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/edtu2J_US-KkHQfAsobT5Q/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2021-04-21T18:24:52.814Z] 18:24:52     INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_backward_forward_navigation.js | The main process DevToolsServer has no pending connection when the test ends - 
[task 2021-04-21T18:24:52.814Z] 18:24:52     INFO - Buffered messages finished
[task 2021-04-21T18:24:52.815Z] 18:24:52     INFO - TEST-UNEXPECTED-FAIL | devtools/client/framework/test/browser_toolbox_backward_forward_navigation.js | This test exceeded the timeout threshold. It should be rewritten or split up. If that's not possible, use requestLongerTimeout(N), but only as a last resort. - 
[task 2021-04-21T18:24:52.815Z] 18:24:52     INFO - GECKO(1850) | MEMORY STAT vsizeMaxContiguous not supported in this build configuration.
[task 2021-04-21T18:24:52.815Z] 18:24:52     INFO - GECKO(1850) | MEMORY STAT | vsize 7836MB | residentFast 393MB | heapAllocated 137MB
[task 2021-04-21T18:24:52.815Z] 18:24:52     INFO - TEST-OK | devtools/client/framework/test/browser_toolbox_backward_forward_navigation.js | took 173321ms
[task 2021-04-21T18:24:52.815Z] 18:24:52     INFO - checking window state
[task 2021-04-21T18:24:52.815Z] 18:24:52     INFO - TEST-START | devtools/client/framework/test/browser_toolbox_backward_forward_navigation.js
[task 2021-04-21T18:25:01.020Z] 18:25:01     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "UPDATE_GRIDS"
[task 2021-04-21T18:25:01.103Z] 18:25:01     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "CLEAR_FLEXBOX"
[task 2021-04-21T18:25:02.286Z] 18:25:02     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "UPDATE_OFFSET_PARENT"
[task 2021-04-21T18:25:02.287Z] 18:25:02     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "UPDATE_LAYOUT"
[task 2021-04-21T18:25:02.335Z] 18:25:02     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "UPDATE_GRIDS"
[task 2021-04-21T18:25:02.335Z] 18:25:02     INFO - GECKO(1850) | console.error: (new Error("Protocol error (noSuchActor): No such actor for ID: server0.conn2.child4/domnode28 from: server0.conn2.child4/domnode28", "resource://devtools/shared/protocol/Front.js", 365))
[task 2021-04-21T18:25:02.515Z] 18:25:02     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "CLEAR_FLEXBOX"
[task 2021-04-21T18:25:10.168Z] 18:25:10     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "UPDATE_GRIDS"
[task 2021-04-21T18:25:16.045Z] 18:25:16     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "CLEAR_FLEXBOX"
[task 2021-04-21T18:25:16.122Z] 18:25:16     INFO - GECKO(1850) | console.log: "[DISPATCH] action type:" "CLEAR_FLEXBOX"```

Set release status flags based on info from the regressing bug 1706483

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.