Filed by: sstanca [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=399862691&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Yfne14KwSJKWn4lVAPM-5w/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/Yfne14KwSJKWn4lVAPM-5w/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2022-12-16T07:52:49.410Z] 07:52:49     INFO - TEST-START | layout/generic/test/test_scroll_on_display_contents.html
[task 2022-12-16T07:52:50.560Z] 07:52:50     INFO - GECKO(1457) | console.error: (new TypeError("can't access property \"addBlocker\", lazy.AsyncShutdown.profileBeforeChange is undefined", "resource://services-settings/Database.jsm", 510))
[task 2022-12-16T07:52:50.562Z] 07:52:50     INFO - GECKO(1457) | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2022-12-16T07:52:50.588Z] 07:52:50     INFO - GECKO(1457) | PromiseApzRepaintsFlushed: APZ flush done
[task 2022-12-16T07:52:50.614Z] 07:52:50     INFO - GECKO(1457) | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2022-12-16T07:52:50.629Z] 07:52:50     INFO - GECKO(1457) | PromiseApzRepaintsFlushed: APZ flush done
[task 2022-12-16T07:52:50.663Z] 07:52:50     INFO - GECKO(1457) | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2022-12-16T07:52:50.678Z] 07:52:50     INFO - GECKO(1457) | PromiseApzRepaintsFlushed: APZ flush done
[task 2022-12-16T07:53:02.653Z] 07:53:02     INFO - GECKO(1457) | 2022-12-16 07:53:02.652 firefox[1457:18391] Persistent UI failed to open file file:///Users/cltbld/Library/Saved%20Application%20State/org.mozilla.nightly.savedState/window_1.data: No such file or directory (2)
[task 2022-12-16T07:57:50.157Z] 07:57:50     INFO - TEST-INFO | started process screencapture
[task 2022-12-16T07:57:50.281Z] 07:57:50     INFO - TEST-INFO | screencapture: exit 0
[task 2022-12-16T07:57:50.281Z] 07:57:50     INFO - Buffered messages logged at 07:52:50
[task 2022-12-16T07:57:50.282Z] 07:57:50     INFO - TEST-PASS | layout/generic/test/test_scroll_on_display_contents.html | The target should not be scrolled 
[task 2022-12-16T07:57:50.282Z] 07:57:50     INFO - TEST-PASS | layout/generic/test/test_scroll_on_display_contents.html | The target should not be scrolled 
[task 2022-12-16T07:57:50.283Z] 07:57:50     INFO - TEST-PASS | layout/generic/test/test_scroll_on_display_contents.html | The target should not be scrolled 
[task 2022-12-16T07:57:50.283Z] 07:57:50     INFO - Buffered messages finished
[task 2022-12-16T07:57:50.283Z] 07:57:50     INFO - TEST-UNEXPECTED-FAIL | layout/generic/test/test_scroll_on_display_contents.html | Test timed out. - 
[task 2022-12-16T07:57:51.244Z] 07:57:51     INFO - GECKO(1457) | MEMORY STAT vsizeMaxContiguous not supported in this build configuration.
[task 2022-12-16T07:57:51.245Z] 07:57:51     INFO - GECKO(1457) | MEMORY STAT | vsize 6572MB | residentFast 67MB | heapAllocated 7MB
[task 2022-12-16T07:57:51.256Z] 07:57:51     INFO - TEST-OK | layout/generic/test/test_scroll_on_display_contents.html | took 301845ms

:daisuke, since you are the author of the regressor, bug 1790253, could you take a look?

For more information, please visit auto_nag documentation.

Fixed by backout: https://hg.mozilla.org/integration/autoland/rev/51e3611759734289f956e3df323303b8b76a6cb8