Bug 259497

Summary:	REGRESSION(265561@main): [ x86_64 ] imported/w3c/web-platform-tests/webcodecs/temporal-svc-encoding.https.any.html?vp9 is a constant failure
Product:	WebKit	Reporter:	Ben Schwartz <ben_schwartz>
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=259496 https://bugs.webkit.org/show_bug.cgi?id=258076

Description Ben Schwartz 2023-07-25 14:31:17 PDT

imported/w3c/web-platform-tests/webcodecs/temporal-svc-encoding.https.any.worker.html?vp9

This test is a constant failure on x86_64 machines.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fwebcodecs%2Ftemporal-svc-encoding.https.any.html%3Fvp9

TEXT DIFF:

 PASS SVC L1T2
-PASS SVC L1T3
+FAIL SVC L1T3 assert_equals: corrupted_frames: 8 expected 0 but got 1

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Debug-WK2-GPUProcess-Tests/265564@main%20(3027)/imported/w3c/web-platform-tests/webcodecs/temporal-svc-encoding.https.any_vp9-pretty-diff.html

Comment 1 Radar WebKit Bug Importer 2023-07-25 14:31:29 PDT

<rdar://problem/112860290>

Comment 2 Ben Schwartz 2023-07-25 14:32:26 PDT

I was able to reproduce this bug on macOS Ventura using x86_64 running the test as follows:

run-webkit-tests imported/w3c/web-platform-tests/webcodecs/temporal-svc-encoding.https.any.html

I was also able to bisect a regression point. This test reproduced at 265561@main, but it did not reproduce at 265560@main. Changes at 265561@main are directly related to this error, and is likely what caused the failure.

Comment 3 Ben Schwartz 2023-07-25 16:20:33 PDT

I have marked this test as a constant failure while this issue is investigated. (Link: https://github.com/WebKit/WebKit/pull/16083)

Comment 4 EWS 2023-07-26 12:21:27 PDT

Test gardening commit 266324@main (8b0667f1556d): <https://commits.webkit.org/266324@main>

Reviewed commits have been landed. Closing PR #16083 and removing active labels.