[Webkit-unassigned] [Bug 195635] New: [ Mac WK2 ] REGRESSION (r242313) Layout Test scrollingcoordinator/mac/multiple-fixed.html is a flaky time out and image diff

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195635

            Bug ID: 195635
           Summary: [ Mac WK2 ] REGRESSION (r242313) Layout Test
                    scrollingcoordinator/mac/multiple-fixed.html is a
                    flaky time out and image diff
           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
                CC: lforschler at apple.com

The following layout test is failing on Mac WK2 and Mac WK2 Debug

scrollingcoordinator/mac/multiple-fixed.html

Probable cause:

Test is failing as of https://trac.webkit.org/changeset/242313/webkit . Ran tests locally with newest revision 242800, and r242313 and got same timeout, image diff.
Test is failing locally with debug revision 242805 as well.

Reproduced with :

run-webkit-tests scrollingcoordinator/mac/multiple-fixed.html --iterations 500 -f --no-retry
run-webkit-tests scrollingcoordinator/mac/multiple-fixed.html -f --iterations 500 --no-retry --debug

Flakiness Dashboard:

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

Image Diff: 

https://build.webkit.org/results/Apple%20Mojave%20Debug%20WK2%20(Tests)/r242560%20(1841)/scrollingcoordinator/mac/multiple-fixed-diffs.html

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