[Webkit-unassigned] [Bug 260185] New: REGRESSION(262173 at main): media/media-source/media-source-fastseek.html is a flaky text failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260185

            Bug ID: 260185
           Summary: REGRESSION(262173 at main):
                    media/media-source/media-source-fastseek.html is a
                    flaky text failure
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben_schwartz at apple.com
                CC: webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com

media/media-source/media-source-fastseek.html

This test is a flaky text failure on wk2 on macOS Monterey and above (EXCEPT on debug builds on x86_64 architecture).

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=media%2Fmedia-source%2Fmedia-source-fastseek.html&flavor=wk2&version_name=Monterey&version_name=Ventura

TEXT DIFF:

 EXPECTED (video.currentTime.toFixed(1) == '3') OK
 RUN(video.fastSeek(2))
 EVENT(seeked)
-EXPECTED (video.currentTime.toFixed(1) == '0') OK
+EXPECTED (video.currentTime.toFixed(1) == '0'), OBSERVED '3.0' FAIL
 END OF TEST

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK2-Tests/266873@main%20(4437)/media/media-source/media-source-fastseek-diff.txt

REPRODUCTION:

I was able to reproduce this bug on macOS Monterey (x86_64) running the test as follows:

run-webkit-tests --clobber-old-results --iterations 1000 --exit-after-n-failures 5 media/media-source/media-source-fastseek.html

REGRESSION:

I was able to bisect a regression point using the flakiness dashboard. This test reproduced at 262173 at main, but it did not reproduce at 262172 at main. Changes at 262173 at main appear to be directly related to this error, and is likely what caused the failure.

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