REGRESSION (r226059?): [macOS WK2] Layout Test fast/mediastream/MediaStream-MediaElement-setObject-null.html is flaky

[Ryan Haddad]

The following layout test is flaky on macOS WK2

fast/mediastream/MediaStream-MediaElement-setObject-null.html

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fmediastream%2FMediaStream-MediaElement-setObject-null.html

--- /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/fast/mediastream/MediaStream-MediaElement-setObject-null-expected.txt
+++ /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/fast/mediastream/MediaStream-MediaElement-setObject-null-actual.txt
@@ -1,3 +1,4 @@
+CONSOLE MESSAGE: Unhandled Promise Rejection: AbortError: The operation was aborted.
 PASS video.srcObject = stream did not throw exception.
 PASS video.duration is Number.POSITIVE_INFINITY
 PASS video.srcObject = null did not throw exception.

[Ryan Haddad]

This may have regressed with https://trac.webkit.org/changeset/226059/webkit

[Ryan Haddad]

I can reproduce the failure on ToT with:
run-webkit-tests -fg --iter 10 --no-retry-failure fast/mediastream/MediaStream-MediaElement-setObject-null.html

[Radar WebKit Bug Importer]

<rdar://problem/36188221>

[Matt Lewis]

Marked as flaky in: https://trac.webkit.org/changeset/226455/webkit

[Jer Noble]

Created attachment 336221 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 336221 [details]
Patch

Clearing flags on attachment: 336221

Committed r229822: <https://trac.webkit.org/changeset/229822>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.