[Webkit-unassigned] [Bug 198757] New: [ Mojave+ ] Layout Test compositing/fixed-with-main-thread-scrolling.html is a flaky timeout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198757

            Bug ID: 198757
           Summary: [ Mojave+ ] Layout Test
                    compositing/fixed-with-main-thread-scrolling.html is a
                    flaky 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 Release and Debug

compositing/fixed-with-main-thread-scrolling.html

Probable cause:

Appears to have been flaky its entire history since its last change in r238883 . 

Local testing I verified flaky behavior from current revision all the way back to 238883, but flaky behavior did seem to get worse around r244215 but I cannot verify completely since results are very sporadic. 

Verified with :

run-webkit-tests compositing/fixed-with-main-thread-scrolling.html --iter 500 -f

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=compositing%2Ffixed-with-main-thread-scrolling.html

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