Bug 260529

Summary:	REGRESSION(256951@main): [Ventura+ x86_64] animations/suspend-resume-animation-events.html is a flaky text 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=248218 https://bugs.webkit.org/show_bug.cgi?id=51002

Description Ben Schwartz 2023-08-22 11:13:09 PDT

animations/suspend-resume-animation-events.html

This test is a flaky text failure on macOS Ventura builds on x86_64 machines.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=animations%2Fsuspend-resume-animation-events.html&recent=false&platform=mac&version_name=Ventura&architecture=x86_64

TEXT DIFF:

 Log
 
 start animation move
-iteration animation move
 end animation move

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Release-WK1-Tests/266464@main%20(3514)/animations/suspend-resume-animation-events-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this bug on macOS Ventura 13.5 (22G74) ToT on an x86_64 machine using the following command:

run-webkit-tests --clobber-old-results --debug --verbose --iterations 100 --child-processes 10 -f --exit-after-n-failures 1 animations/suspend-resume-animation-events.html

REGRESSION:

I was able to bisect a regression point using the flakiness dashboard. This test reproduced at 256951@main, but it did not reproduce at 256950@main. Changes at 256951@main appear to be directly related to this error, and is likely what caused the failure.

Comment 1 Radar WebKit Bug Importer 2023-08-22 11:13:19 PDT

<rdar://problem/114271582>

Comment 2 Ben Schwartz 2023-08-22 11:24:35 PDT

Testing on macOS Sonoma indicates this issue persists in versions above macOS Ventura. The reproduction command needed an increase in iterations:

run-webkit-tests --clobber-old-results --debug --verbose --iterations 500 --child-processes 10 -f --exit-after-n-failures 1 animations/suspend-resume-animation-events.html

Comment 3 EWS 2023-08-22 11:35:14 PDT

Test gardening commit 267144@main (71613469caa9): <https://commits.webkit.org/267144@main>

Reviewed commits have been landed. Closing PR #16937 and removing active labels.