[Webkit-unassigned] [Bug 218995] New: REGRESSION: [ Mac ] fast/lists/001.html and fast/lists/001-vertical.html are flaky crashing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218995

            Bug ID: 218995
           Summary: REGRESSION: [ Mac ] fast/lists/001.html and
                    fast/lists/001-vertical.html are flaky crashing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com

fast/lists/001.html
fast/lists/001-vertical.html

these two tests started to flakily crash 

History
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=fast%2Flists%2F001-vertical.html&test=fast%2Flists%2F001.html

Uploaded logs

Application Specific Information:
CRASHING TEST: fast/lists/001.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore                   0x000000010a6c9557 WebCore::RenderStyle::clone(WebCore::RenderStyle const&) + 7 (RenderStyle.cpp:108)
1   com.apple.WebCore                   0x000000010a60bae8 WebCore::RenderListItem::computeMarkerStyle() const + 536
2   com.apple.WebCore                   0x000000010a725ed7 WebCore::RenderTreeBuilder::List::updateItemMarker(WebCore::RenderListItem&) + 151 (RenderTreeBuilderList.cpp:99)
3   com.apple.WebCore                   0x000000010a7225da WebCore::RenderTreeBuilder::updateAfterDescendants(WebCore::RenderElement&) + 74
4   com.apple.WebCore                   0x000000010a72d2b7 WebCore::RenderTreeUpdater::popParent() + 103 (RenderTreeUpdater.cpp:238)
5   com.apple.WebCore                   0x000000010a72bf88 WebCore::RenderTreeUpdater::updateRenderTree(WebCore::ContainerNode&) + 680 (RenderTreeUpdater.cpp:159)

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