[Webkit-unassigned] [Bug 275963] New: REGRESSION (262629 at main): [ x86_64/arm64 difference ] svg/W3C-SVG-1.1/metadata-example-01-b.svg is constantly failing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275963

            Bug ID: 275963
           Summary: REGRESSION (262629 at main): [ x86_64/arm64 difference ]
                    svg/W3C-SVG-1.1/metadata-example-01-b.svg is
                    constantly failing.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben_schwartz at apple.com
                CC: simon.fraser at apple.com,
                    webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com, ysuzuki at apple.com

svg/W3C-SVG-1.1/metadata-example-01-b.svg

This test is constantly failing on macOS arm64, and iOS simulator running on x86_64 machines.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=svg%2FW3C-SVG-1.1%2Fmetadata-example-01-b.svg&recent=false&version_name=iOS%2017&version_name=Ventura

TEXT DIFF:

I'm not going to post the SVG monstrosity here, but the important part is:
-0.47
+0.470001

That text diff is from macOS arm64. iOS expects the opposite. I assume this is due to differing baselines, but I haven't checked.

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK1-Tests/280415@main%20(10103)/svg/W3C-SVG-1.1/metadata-example-01-b-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this issue on macOS Sonoma (14.4, 23E214/arm64) ToT using the following command:

run-webkit-tests -v svg/W3C-SVG-1.1/metadata-example-01-b.svg

REGRESSION:

Contextual information indicates this issue started appearing on macOS when we enabled UI-side compositing by default in 262629 at main. I'm not sure what the iOS regression point is, as we aren't using x86_64 to run simulator tests.

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