[Webkit-unassigned] [Bug 261919] New: NEW TEST(247465 at main): [ macOS wk2 ] webanimations/frame-rate/animation-frame-rate-alignment-started-with-one-frame-separation.html is a flaky failure.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261919

            Bug ID: 261919
           Summary: NEW TEST(247465 at main): [ macOS wk2 ]
                    webanimations/frame-rate/animation-frame-rate-alignmen
                    t-started-with-one-frame-separation.html is a flaky
                    failure.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben_schwartz at apple.com
                CC: dino at apple.com, graouts at apple.com,
                    webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com

webanimations/frame-rate/animation-frame-rate-alignment-started-with-one-frame-separation.html

This test has been a flaky failure on macOS wk2 since its introduction at 247465 at main.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=webanimations%2Fframe-rate%2Fanimation-frame-rate-alignment-started-with-one-frame-separation.html&recent=false

TEXT DIFF:

-PASS Animations with the same frameRate started separately fire at the same timeline time
+FAIL Animations with the same frameRate started separately fire at the same timeline time assert_equals: The second timestamp was for animation "two" expected "two" but got "one"

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK2-Tests/268273%40main%20(5054)/webanimations/frame-rate/animation-frame-rate-alignment-started-with-one-frame-separation-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this issue on macOS Ventura (13.5, 22G74/arm64) ToT using the following command:

run-webkit-tests --clobber-old-results --verbose --iterations 100 --exit-after-n-failures 1 --child-processes 10 -f webanimations/frame-rate/animation-frame-rate-alignment-started-with-one-frame-separation.html

REGRESSION:

This test has been flaky since it was introduced at 247465 at main.

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