[Webkit-unassigned] [Bug 198661] New: Layout Test landed flaky [ Mojave WK2 ] scrollingcoordinator/mac/nested-sticky.html is a flaky ImageOnlyFailure and Timeout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198661

            Bug ID: 198661
           Summary: Layout Test landed flaky [ Mojave WK2 ]
                    scrollingcoordinator/mac/nested-sticky.html is a flaky
                    ImageOnlyFailure and Timeout
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com

The following layout test is flaky on Mojave WK2 Debug and Release

scrollingcoordinator/mac/nested-sticky.html

Probable cause:

Test is more flaky on Debug runs. Test was added in r244630 and appears to have been flaky its entire available history on the dashboard. 

The ImageOnlyFailure's appear to only happen on Debug runs. Cannot reproduce them on Release builds, but the Release timeout is reproducible just as easily on Release builds.

Reproducible with:

run-webkit-tests scrollingcoordinator/mac/nested-sticky.html --iter 100 -f --debug

Will average aboutt 3 reference mismatches and 4 timeouts be 100 iteration run. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=scrollingcoordinator%2Fmac%2Fnested-sticky.html

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