[Webkit-unassigned] [Bug 198129] New: REGRESSION: Layout Test scrollbars/overflow-custom-scrollbar-crash.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198129

            Bug ID: 198129
           Summary: REGRESSION: Layout Test
                    scrollbars/overflow-custom-scrollbar-crash.html is
                    flaky
           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: tsavell at apple.com

The following layout test is flaky on MacOS WK1

scrollbars/overflow-custom-scrollbar-crash.html

Probable cause:

This test became flakey recently. The test does not fail when ran on its own. using the list of tests on the same test runner I was able to bisect down to 1 test that is causing the failure: 
pointerevents/mouse/pointerdown-prevent-default.html 

Running this test before scrollbars/overflow-custom-scrollbar-crash.html casques a 100% failure. 


I am able to reproduce it using command:
rwt --root testbuild-245594 pointerevents/mouse/pointerdown-prevent-default.html scrollbars/overflow-custom-scrollbar-crash.html --child-processes 1 -1

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=scrollbars%2Foverflow-custom-scrollbar-crash.html

Diff:
--- /Volumes/Data/slave/mojave-release-tests-wk1/build/layout-test-results/scrollbars/overflow-custom-scrollbar-crash-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk1/build/layout-test-results/scrollbars/overflow-custom-scrollbar-crash-actual.txt
@@ -1 +1,2 @@
+CONSOLE MESSAGE: line 100: TypeError: undefined is not an object (evaluating 'scroller.parentNode')
 This test should not crash

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