Bug 304427 – REGRESSION(304572@main): [macOS iOS] fast/html/a-tooltip-null.html is a flaky crash

• Component: New Bugs
• Status: NEW

[Marta Darbinyan]

The following test is flaky crash on iOS and macOS. The change 304572@main is most likely the cause of the crash. 

fast/html/a-tooltip-null.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0  com.apple.WebCore       	       0x1241cc210 WebCore::FrameLoader::didReachLayoutMilestone(WTF::OptionSet<WebCore::LayoutMilestone, (WTF::ConcurrencyTag)0>)
1  com.apple.WebCore       	       0x12433978c WebCore::LocalFrameView::firePaintRelatedMilestonesIfNeeded()
2  com.apple.WebCore       	       0x1243396e0 WebCore::LocalFrameView::didPaintContents(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::LocalFrameView::PaintingState&)
3  com.apple.WebCore       	       0x1249331f0 WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior, (WTF::ConcurrencyTag)0>, WebCore::RegionContext*)::$_51::operator()(WebCore::RenderLayer&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag, (WTF::ConcurrencyTag)0>) const
4  com.apple.WebCore       	       0x124932ddc WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior, (WTF::ConcurrencyTag)0>, WebCore::RegionContext*)
5  com.apple.WebCore       	       0x124934224 WebCore::RenderLayerBacking::paintContents(WebCore::GraphicsLayer const&, WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior, (WTF::ConcurrencyTag)0>)
6  com.apple.WebCore       	       0x1245a5a0c WebCore::GraphicsLayer::paintGraphicsLayerContents(WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior, (WTF::ConcurrencyTag)0>) const
7  com.apple.WebCore       	       0x1231e1154 WebCore::PlatformCALayer::drawLayerContents(WebCore::GraphicsContext&, WebCore::PlatformCALayer*, WTF::Vector<WebCore::FloatRect, 5ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior, (WTF::ConcurrencyTag)0>)
8  com.apple.WebCore       	       0x124669d38 WebCore::TileGrid::platformCALayerPaintContents(WebCore::PlatformCALayer*, WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior, (WTF::ConcurrencyTag)0>)
9  com.apple.WebKit        	       0x10e99eed0 WebKit::RemoteLayerBackingStore::drawInContext(WebCore::GraphicsContext&)
10  com.apple.WebKit        	       0x10e9acc58 WebKit::RemoteLayerWithRemoteRenderingBackingStore::createContextAndPaintContents()
11  com.apple.WebKit        	       0x10e99ecb4 WebKit::RemoteLayerBackingStore::paintContents()

Test history:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fhtml%2Fa-tooltip-null.html&flavor=wk2
Test result: 
https://ews-build.webkit.org/#/builders/136/builds/40825

[Radar WebKit Bug Importer]

<rdar://problem/166812256>

[EWS]

Test gardening commit 304699@main (0bbef2e809a7): <https://commits.webkit.org/304699@main>

Reviewed commits have been landed. Closing PR #55646 and removing active labels.

Pull request: https://github.com/WebKit/WebKit/pull/55667