[Webkit-unassigned] [Bug 266102] New: NEW-TEST(271524 at main): [ macOS ] TestWebKitAPI.MonospaceFontsTest.EnsureMonospaceFontInvariants is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266102

            Bug ID: 266102
           Summary: NEW-TEST(271524 at main): [ macOS ]
                    TestWebKitAPI.MonospaceFontsTest.EnsureMonospaceFontIn
                    variants is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jenner at apple.com
                CC: mmaxfield at apple.com

TestWebKitAPI.MonospaceFontsTest.EnsureMonospaceFontInvariants

is a flaky failing API test on macOS. It's very flaky on one Ventura Intel queue, but it's near constant on apple silicon queues running Monterey and up. It appears to have been introduced recently at https://commits.webkit.org/271524@main, and has been in this reported state since.

HISTORY:
https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.MonospaceFontsTest.EnsureMonospaceFontInvariants

STDIO FAIL TXT:
TestWebKitAPI.MonospaceFontsTest.EnsureMonospaceFontInvariants
        /Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16  width    Which is: 8/Volumes/Data/worker/Apple-Sonoma-Release-Build/build/Tools/TestWebKitAPI/Tests/WebCore/MonospaceFontTests.cpp:67Expected equality of these values:  originalWidth    Which is: 16EXCEEDED LOG LINE THRESHOLD OF 250

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