Filed by: ccozmuta [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=355579321&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CgGj3kkNSxaQVmzv9aJAEg/runs/2/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/CgGj3kkNSxaQVmzv9aJAEg/runs/2/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2021-10-21T12:24:45.095Z] 12:24:45     INFO - TEST-START | dom/media/mediasource/test/test_HEAAC_extradata.html
[task 2021-10-21T12:24:49.810Z] 12:24:49     INFO - TEST-INFO | started process screentopng
[task 2021-10-21T12:24:50.293Z] 12:24:50     INFO - TEST-INFO | screentopng: exit 0
[task 2021-10-21T12:24:50.293Z] 12:24:50     INFO - Buffered messages logged at 12:24:46
[task 2021-10-21T12:24:50.293Z] 12:24:50     INFO - TEST-PASS | dom/media/mediasource/test/test_HEAAC_extradata.html | fetchWithXHR load uri='whitenoise-he-aac-5s.mp4' status=200 
[task 2021-10-21T12:24:50.294Z] 12:24:50     INFO - Loading buffer: [0, 27078)
[task 2021-10-21T12:24:50.294Z] 12:24:50     INFO - SourceBuffer buffered ranges grew from TimeRanges:  to TimeRanges: [0, 5.162666)
[task 2021-10-21T12:24:50.294Z] 12:24:50     INFO - Buffered messages finished
[task 2021-10-21T12:24:50.295Z] 12:24:50     INFO - TEST-UNEXPECTED-FAIL | dom/media/mediasource/test/test_HEAAC_extradata.html | Energy present at 15kHz (bin index: 698) when playing white
[task 2021-10-21T12:24:50.295Z] 12:24:50     INFO -        noise encoded in HE-AAC -63.2110595703125 
[task 2021-10-21T12:24:50.296Z] 12:24:50     INFO -     SimpleTest.ok@SimpleTest/SimpleTest.js:417:16
[task 2021-10-21T12:24:50.297Z] 12:24:50     INFO -     checkHighFrequencyContent@dom/media/mediasource/test/test_HEAAC_extradata.html:57:5
[task 2021-10-21T12:24:51.218Z] 12:24:51     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-10-21T12:24:51.218Z] 12:24:51     INFO - TEST-UNEXPECTED-FAIL | dom/media/mediasource/test/test_HEAAC_extradata.html | Energy present at 15kHz (bin index: 698) when playing white
[task 2021-10-21T12:24:51.218Z] 12:24:51     INFO -        noise encoded in HE-AAC -60.42582702636719 
[task 2021-10-21T12:24:51.218Z] 12:24:51     INFO -     SimpleTest.ok@SimpleTest/SimpleTest.js:417:16
[task 2021-10-21T12:24:51.219Z] 12:24:51     INFO -     checkHighFrequencyContent@dom/media/mediasource/test/test_HEAAC_extradata.html:57:5
[task 2021-10-21T12:24:51.224Z] 12:24:51     INFO - GECKO(1550) | MEMORY STAT vsizeMaxContiguous not supported in this build configuration.
[task 2021-10-21T12:24:51.225Z] 12:24:51     INFO - GECKO(1550) | MEMORY STAT | vsize 2645MB | residentFast 132MB | heapAllocated 14MB
[task 2021-10-21T12:24:51.248Z] 12:24:51     INFO - TEST-OK | dom/media/mediasource/test/test_HEAAC_extradata.html | took 6153ms
[task 2021-10-21T12:24:51.332Z] 12:24:51     INFO - TEST-START | Shutdown

This was fixed by backout: https://hg.mozilla.org/integration/autoland/rev/ddb11a86bf436e406bea5d2494cd7a5479effd8e

Set release status flags based on info from the regressing bug 1694085