Bug 261919

Summary:	NEW TEST(247465@main): [ macOS wk2 ] webanimations/frame-rate/animation-frame-rate-alignment-started-with-one-frame-separation.html is a flaky failure.
Product:	WebKit	Reporter:	Ben Schwartz <ben_schwartz>
Component:	Animations	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	dino, graouts, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=236778 https://bugs.webkit.org/show_bug.cgi?id=239574

Description Ben Schwartz 2023-09-21 16:44:11 PDT

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@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@main.

Comment 1 Radar WebKit Bug Importer 2023-09-21 16:44:36 PDT

<rdar://problem/115867501>

Comment 2 EWS 2023-09-21 17:03:01 PDT

Test gardening commit 268285@main (63a48f8d2b4b): <https://commits.webkit.org/268285@main>

Reviewed commits have been landed. Closing PR #18055 and removing active labels.