Bug 291904

Summary:	REGRESSION(293851@main):[iOS MacOS Debug] ASSERTION FAILED: !layer \|\| !layer->hasAncestor in fast/css/view-transitions-hide-under-page-background-color.html (flaky in EWS)
Product:	WebKit	Reporter:	Marta Darbinyan <darbinyan>
Component:	New Bugs	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Marta Darbinyan

Reported 2025-04-22 11:12:38 PDT

There is an assertion failure in MacOS Debug queue. Failed test: fast/css/view-transitions-hide-under-page-background-color.html ASSERTION FAILED: !layer || !layer->hasAncestor(this) /Volumes/Data/worker/macOS-Sequoia-Debug-Build-EWS/build/Source/WebCore/platform/graphics/GraphicsLayer.cpp(291) : void WebCore::GraphicsLayer::setParent(GraphicsLayer *) 1 0x30645c544 WebCore::GraphicsLayer::setParent(WebCore::GraphicsLayer*) 2 0x30645ca8c WebCore::GraphicsLayer::addChild(WTF::Ref<WebCore::GraphicsLayer, WTF::RawPtrTraits<WebCore::GraphicsLayer>, WTF::DefaultRefDerefTraits<WebCore::GraphicsLayer>>&&) 3 0x3065a742c WebCore::GraphicsLayerCA::addChild(WTF::Ref<WebCore::GraphicsLayer, WTF::RawPtrTraits<WebCore::GraphicsLayer>, WTF::DefaultRefDerefTraits<WebCore::GraphicsLayer>>&&) 4 0x30645c8b0 WebCore::GraphicsLayer::setChildren(WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::RawPtrTraits<WebCore::GraphicsLayer>, WTF::DefaultRefDerefTraits<WebCore::GraphicsLayer>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&) 5 0x3065a73cc WebCore::GraphicsLayerCA::setChildren(WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::RawPtrTraits<WebCore::GraphicsLayer>, WTF::DefaultRefDerefTraits<WebCore::GraphicsLayer>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&) 6 0x306d1366c WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::RawPtrTraits<WebCore::GraphicsLayer>, WTF::DefaultRefDerefTraits<WebCore::GraphicsLayer>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WebCore::RenderLayerCompositor::UpdateBackingTraversalState&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>) 7 0x306d0febc WebCore::RenderLayerCompositor::updateCompositingLayers(WebCore::CompositingUpdateType, WebCore::RenderLayer*) 8 0x306d0f174 WebCore::RenderLayerCompositor::didRecalcStyleWithNoPendingLayout() 9 0x305e487dc WebCore::LocalFrameViewLayoutContext::updateCompositingLayersAfterStyleChange() 10 0x304bcf984 WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType) 11 0x304bd0538 WebCore::Document::updateStyleIfNeeded() 12 0x304bd095c WebCore::Document::updateLayout(WTF::OptionSet<WebCore::LayoutOptions>, WebCore::Element const*) 13 0x305e40ad0 WebCore::LocalFrameView::updateLayoutAndStyleIfNeededRecursive(WTF::OptionSet<WebCore::LayoutOptions>) 14 0x305eb7d14 WebCore::Page::layoutIfNeeded(WTF::OptionSet<WebCore::LayoutOptions>) 15 0x305eb8a08 WebCore::Page::updateRendering() 16 0x1193cdaf4 WebKit::WebPage::updateRendering() 17 0x11601c730 WebKit::RemoteLayerTreeDrawingArea::updateRendering() 18 0x116023ae0 WebCore::Timer::Timer<WebKit::RemoteLayerTreeDrawingArea, WebKit::RemoteLayerTreeDrawingArea>(WebKit::RemoteLayerTreeDrawingArea&, void (WebKit::RemoteLayerTreeDrawingArea::*)())::'lambda'()::operator()() const 19 0x116023a18 WTF::Detail::CallableWrapper<WebCore::Timer::Timer<WebKit::RemoteLayerTreeDrawingArea, WebKit::RemoteLayerTreeDrawingArea>(WebKit::RemoteLayerTreeDrawingArea&, void (WebKit::RemoteLayerTreeDrawingArea::*)())::'lambda'(), void>::call() 20 0x115767190 WTF::Function<void ()>::operator()() const 21 0x116021d20 WebCore::Timer::fired() 22 0x3061ce42c WebCore::ThreadTimers::sharedTimerFiredInternal() 23 0x3061d8338 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const 24 0x3061d82e4 WTF::Detail::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0, void>::call() 25 0x3000341a8 WTF::Function<void ()>::operator()() const 26 0x306174eb8 WebCore::MainThreadSharedTimer::fired() 27 0x3062eb63c WebCore::timerFired(__CFRunLoopTimer*, void*) 28 0x18f276394 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ 29 0x18f276038 __CFRunLoopDoTimer 30 0x18f275b48 __CFRunLoopDoTimers 31 0x18f25b530 __CFRunLoopRun com.apple.WebKit.WebContent.Development terminated (pid 5829) for reason: crash LEAK: 1 WebPageProxy Test history: https://results.webkit.org/?suite=layout-tests&test=fast%2Fcss%2Fview-transitions-hide-under-page-background-color.html&style=debug&architecture=arm64 Test result: https://ews-build.webkit.org/#/builders/122/builds/20077

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Radar WebKit Bug Importer

Comment 1 2025-04-22 11:13:10 PDT

<rdar://problem/149783892>

EWS

Comment 2 2025-04-22 13:12:57 PDT

Test gardening commit 293972@main (36ff5a9a7fff): <https://commits.webkit.org/293972@main> Reviewed commits have been landed. Closing PR #44377 and removing active labels.

Matt Woodrow

Comment 3 2025-04-22 19:29:52 PDT

Pull request: https://github.com/WebKit/WebKit/pull/44400

EWS

Comment 4 2025-04-23 16:04:01 PDT

Committed 294027@main (497b138d4b4d): <https://commits.webkit.org/294027@main> Reviewed commits have been landed. Closing PR #44400 and removing active labels.

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