[Webkit-unassigned] [Bug 221218] New: REGRESSION [ BigSur Wk2 ] imported/w3c/web-platform-tests/media-source/mediasource-config-change-webm-v-framesize.html is flakey failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221218

            Bug ID: 221218
           Summary: REGRESSION [ BigSur Wk2 ]
                    imported/w3c/web-platform-tests/media-source/mediasour
                    ce-config-change-webm-v-framesize.html is flakey
                    failing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Jenner at apple.com

imported/w3c/web-platform-tests/media-source/mediasource-config-change-webm-v-framesize.html

Is flakey failing on MacOS Big Sur Wk2.

HISTORY URL:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmedia-source%2Fmediasource-config-change-webm-v-framesize.html

DIFF URL:
https://build.webkit.org/results/Apple-BigSur-Release-WK2-Tests/r272143%20(1311)/imported/w3c/web-platform-tests/media-source/mediasource-config-change-webm-v-framesize-diff.txt

DIFF TEXT:
--- /Volumes/Data/slave/bigsur-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/media-source/mediasource-config-change-webm-v-framesize-expected.txt
+++ /Volumes/Data/slave/bigsur-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/media-source/mediasource-config-change-webm-v-framesize-actual.txt
@@ -1,3 +1,5 @@

-PASS Tests webm video-only frame size changes.
+Harness Error (TIMEOUT), message = null

+TIMEOUT Tests webm video-only frame size changes. Test timed out


Bug Reproducible on r272141, same failure verified.

Bug Produced using test: 
run-webkit-test imported/w3c/web-platform-tests/media-source/mediasource-config-change-webm-v-framesize.html  --iterations 1000 -f

Regression point appears r272140, where the test did not crash. 

Bug appears to have been introduced in r272141

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