[Webkit-unassigned] [Bug 214651] New: REGRESSION: [ macOS debug WK2 ] tiled-drawing/scrolling/fast-scroll-mainframe-zoom.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214651

            Bug ID: 214651
           Summary: REGRESSION: [ macOS debug WK2 ]
                    tiled-drawing/scrolling/fast-scroll-mainframe-zoom.htm
                    l is a flaky crash
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
tiled-drawing/scrolling/fast-scroll-mainframe-zoom.html

This issue seems to have started approximately 07/17/20 and flaky crash every day since then.

History:
https://results.webkit.org/?suite=layout-tests&test=tiled-drawing%2Fscrolling%2Ffast-scroll-mainframe-zoom.html&limit=50000&platform=mac&style=debug

Crash Log:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore            0x00000003340a8dc0 WTFCrash + 16 (Assertions.cpp:295)
1   com.apple.WebCore                   0x0000000315a1f9ab WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore                   0x0000000319f1fabb WebCore::RenderView::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 123 (RenderView.cpp:306)
3   com.apple.WebCore                   0x0000000319dcadbd WebCore::RenderLayer::paintBackgroundForFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebCore::GraphicsContext&, WebCore::GraphicsContext&, WebCore::LayoutRect const&, bool, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RenderObject*) + 637 (RenderLayer.cpp:5048)
4   com.apple.WebCore                   0x0000000319dc7036 WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) + 2582 (RenderLayer.cpp:4695)
5   com.apple.WebCore                   0x0000000319dea953 WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*)::$_21::operator()(WebCore::RenderLayer&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) const + 403 (RenderLayerBacking.cpp:3027)

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