[Webkit-unassigned] [Bug 223285] New: REGRESSION: ASSERTION FAILED: isCSSStackingContext() in WebCore::RenderLayer::beginTransparencyLayers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223285

            Bug ID: 223285
           Summary: REGRESSION: ASSERTION FAILED: isCSSStackingContext()
                    in WebCore::RenderLayer::beginTransparencyLayers
           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: ryanhaddad at apple.com

Seeing the following assert on iOS debug bots with some DragAndDrop API tests

        ASSERTION FAILED: isCSSStackingContext()
        ./rendering/RenderLayer.cpp(2122) : void WebCore::RenderLayer::beginTransparencyLayers(WebCore::GraphicsContext &, const WebCore::RenderLayer::LayerPaintingInfo &, const WebCore::LayoutRect &)
        1   0x12a7eac29 WTFCrash
        2   0x132a8589b WTFCrashWithInfo(int, char const*, char const*, int)
        3   0x13712fd87 WebCore::RenderLayer::beginTransparencyLayers(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WebCore::LayoutRect const&)
        4   0x13713bf5e 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*)
        5   0x137138288 WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        6   0x1371377ed WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        7   0x13713669a WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        8   0x137135940 WebCore::RenderLayer::paintLayer(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        9   0x13713c248 WebCore::RenderLayer::paintList(WebCore::RenderLayer::LayerList, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        10  0x1371384c0 WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        11  0x1371377ed WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        12  0x13713669a WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        13  0x137135940 WebCore::RenderLayer::paintLayer(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        14  0x13713c248 WebCore::RenderLayer::paintList(WebCore::RenderLayer::LayerList, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        15  0x1371384c0 WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)
        16  0x13715d67d WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*)::$_24::operator()(WebCore::RenderLayer&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) const
        17  0x13715cf92 WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*)
        18  0x13715eabf WebCore::RenderLayerBacking::paintContents(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::FloatRect const&, unsigned int)
        19  0x136abb5a4 WebCore::GraphicsLayer::paintGraphicsLayerContents(WebCore::GraphicsContext&, WebCore::FloatRect const&, unsigned int)
        20  0x136b6dd96 WebCore::GraphicsLayerCA::platformCALayerPaintContents(WebCore::PlatformCALayer*, WebCore::GraphicsContext&, WebCore::FloatRect const&, unsigned int)
        21  0x1346070af WebCore::PlatformCALayer::drawLayerContents(WebCore::GraphicsContext&, WebCore::PlatformCALayer*, WTF::Vector<WebCore::FloatRect, 5ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, unsigned int)
        22  0x136bb4ecb WebCore::TileGrid::platformCALayerPaintContents(WebCore::PlatformCALayer*, WebCore::GraphicsContext&, WebCore::FloatRect const&, unsigned int)
        23  0x110e8c79e WebKit::RemoteLayerBackingStore::display()
        24  0x111e9725d WebKit::PlatformCALayerRemote::recursiveBuildTransaction(WebKit::RemoteLayerTreeContext&, WebKit::RemoteLayerTreeTransaction&)
        25  0x111e97504 WebKit::PlatformCALayerRemote::recursiveBuildTransaction(WebKit::RemoteLayerTreeContext&, WebKit::RemoteLayerTreeTransaction&)
        26  0x111e97504 WebKit::PlatformCALayerRemote::recursiveBuildTransaction(WebKit::RemoteLayerTreeContext&, WebKit::RemoteLayerTreeTransaction&)
        27  0x111e97504 WebKit::PlatformCALayerRemote::recursiveBuildTransaction(WebKit::RemoteLayerTreeContext&, WebKit::RemoteLayerTreeTransaction&)
        28  0x111e97504 WebKit::PlatformCALayerRemote::recursiveBuildTransaction(WebKit::RemoteLayerTreeContext&, WebKit::RemoteLayerTreeTransaction&)
        29  0x111914a47 WebKit::RemoteLayerTreeContext::buildTransaction(WebKit::RemoteLayerTreeTransaction&, WebCore::PlatformCALayer&)
        30  0x11077d06e WebKit::RemoteLayerTreeDrawingArea::updateRendering()
        31  0x110787957 decltype(*(std::__1::forward<WebKit::RemoteLayerTreeDrawingArea*&>(fp0)).*fp()) std::__1::__invoke<void (WebKit::RemoteLayerTreeDrawingArea::*&)(), WebKit::RemoteLayerTreeDrawingArea*&, void>(void (WebKit::RemoteLayerTreeDrawingArea::*&)(), WebKit::RemoteLayerTreeDrawingArea*&)

https://build.webkit.org/#/builders/59/builds/515/steps/11/logs/stdio

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