Bug 207274

compositing/shared-backing/sharing-child-contributes-to-overlap.html Description: This test is flaky crashing on iPadOS wk2 debug. History: https://results.webkit.org/?suite=layout-tests&test=compositing%2Fshared-backing%2Fsharing-child-contributes-to-overlap.html&platform=ios&model=iPad%20(5th%20generation)&model=iPad%20Pro%20(9.7-inch)&style=debug&limit=50000 Crash log: No crash log found for com.apple.WebKit.WebContent.Development:70943. stdout: stderr: ASSERTION FAILED: entry.clipData.clippingLayer->isComposited() ./rendering/RenderLayerCompositor.cpp(4580) : WebCore::ScrollingNodeID WebCore::RenderLayerCompositor::updateScrollingNodeForScrollingProxyRole(WebCore::RenderLayer &, WebCore::ScrollingTreeState &, OptionSet<WebCore::RenderLayerCompositor::ScrollingNodeChangeFlags>) 1 0x59308e409 WTFCrash 2 0x59846a71b WTFCrashWithInfo(int, char const*, char const*, int) 3 0x59c018ceb WebCore::RenderLayerCompositor::updateScrollingNodeForScrollingProxyRole(WebCore::RenderLayer&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::ScrollingNodeChangeFlags>) 4 0x59c00e45c WebCore::RenderLayerCompositor::updateScrollCoordinationForLayer(WebCore::RenderLayer&, WebCore::RenderLayer const*, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::ScrollingNodeChangeFlags>) 5 0x59c00b0a9 WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::DumbPtrTraits<WebCore::GraphicsLayer> >, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WebCore::RenderLayerCompositor::UpdateBackingTraversalState&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>) 6 0x59c00b4aa WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::DumbPtrTraits<WebCore::GraphicsLayer> >, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WebCore::RenderLayerCompositor::UpdateBackingTraversalState&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>) 7 0x59c00b4aa WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::DumbPtrTraits<WebCore::GraphicsLayer> >, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WebCore::RenderLayerCompositor::UpdateBackingTraversalState&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>) 8 0x59c007a76 WebCore::RenderLayerCompositor::updateCompositingLayers(WebCore::CompositingUpdateType, WebCore::RenderLayer*) 9 0x59b65c6e3 WebCore::FrameView::updateCompositingLayersAfterLayout() 10 0x59b65f014 WebCore::FrameView::didLayout(WTF::WeakPtr<WebCore::RenderElement>) 11 0x59b6a7f0b WebCore::FrameViewLayoutContext::layout() 12 0x59b63a61c WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive() 13 0x59b6cf89c WebCore::Page::layoutIfNeeded() 14 0x59b6cf94a WebCore::Page::updateRendering() 15 0x58163fc41 WebKit::WebPage::updateRendering() 16 0x58032a622 WebKit::RemoteLayerTreeDrawingArea::flushLayers() 17 0x5803341e1 decltype(*(std::__1::forward<WebKit::RemoteLayerTreeDrawingArea*&>(fp0)).*fp()) std::__1::__invoke<void (WebKit::RemoteLayerTreeDrawingArea::*&)(), WebKit::RemoteLayerTreeDrawingArea*&, void>(void (WebKit::RemoteLayerTreeDrawingArea::*&)(), WebKit::RemoteLayerTreeDrawingArea*&) 18 0x580334160 std::__1::__bind_return<void (WebKit::RemoteLayerTreeDrawingArea::*)(), std::__1::tuple<WebKit::RemoteLayerTreeDrawingArea*>, std::__1::tuple<>, __is_valid_bind_return<void (WebKit::RemoteLayerTreeDrawingArea::*)(), std::__1::tuple<WebKit::RemoteLayerTreeDrawingArea*>, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (WebKit::RemoteLayerTreeDrawingArea::*)(), std::__1::tuple<WebKit::RemoteLayerTreeDrawingArea*>, 0ul, std::__1::tuple<> >(void (WebKit::RemoteLayerTreeDrawingArea::*&)(), std::__1::tuple<WebKit::RemoteLayerTreeDrawingArea*>&, std::__1::__tuple_indices<0ul>, std::__1::tuple<>&&) 19 0x58033410c std::__1::__bind_return<void (WebKit::RemoteLayerTreeDrawingArea::*)(), std::__1::tuple<WebKit::RemoteLayerTreeDrawingArea*>, std::__1::tuple<>, __is_valid_bind_return<void (WebKit::RemoteLayerTreeDrawingArea::*)(), std::__1::tuple<WebKit::RemoteLayerTreeDrawingArea*>, std::__1::tuple<> >::value>::type std::__1::__bind<void (WebKit::RemoteLayerTreeDrawingArea::*&)(), WebKit::RemoteLayerTreeDrawingArea*>::operator()<>() 20 0x5803340a9 WTF::Detail::CallableWrapper<std::__1::__bind<void (WebKit::RemoteLayerTreeDrawingArea::*&)(), WebKit::RemoteLayerTreeDrawingArea*>, void>::call() 21 0x5801882da WTF::Function<void ()>::operator()() const 22 0x580330079 WebCore::Timer::fired() 23 0x59b8ff3aa WebCore::ThreadTimers::sharedTimerFiredInternal() 24 0x59b908011 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const 25 0x59b907fc9 WTF::Detail::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0, void>::call() 26 0x59847e9ca WTF::Function<void ()>::operator()() const 27 0x59b8c4247 WebCore::MainThreadSharedTimer::fired() 28 0x59b966b06 WebCore::timerFired(__CFRunLoopTimer*, void*) 29 0x58afa3b94 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ 30 0x58afa3882 __CFRunLoopDoTimer 31 0x58afa2eda __CFRunLoopDoTimers LEAK: 2 WebPageProxy