Bug 253849 – REGRESSION (261543@main): Assertions in layout tests with UI-side compositing enabled

• Component: Scrolling
• Status: RESOLVED FIXED

[Simon Fraser (smfr)]

261543@main caused this assertion when UI-side compositing is enabled:

ASSERTION FAILED: m_layerHitTestMutex.isLocked()
/Volumes/Data/worker/Apple-Ventura-Debug-Build/build/Source/WebKit/UIProcess/RemoteLayerTree/mac/RemoteScrollingTreeMac.mm(322) : virtual RefPtr<WebCore::ScrollingTreeNode> WebKit::RemoteScrollingTreeMac::scrollingNodeForPoint(WebCore::FloatPoint)
1   0x115994459 WTFCrash
2   0x14cf0307b WTFCrashWithInfo(int, char const*, char const*, int)
3   0x14e830d81 WebKit::RemoteScrollingTreeMac::scrollingNodeForPoint(WebCore::FloatPoint)
4   0x1247e4313 WebCore::ScrollingTree::handleWheelEvent(WebCore::PlatformWheelEvent const&, WTF::OptionSet<WebCore::WheelEventProcessingSteps>)::$_3::operator()() const
5   0x1247e3e40 WebCore::ScrollingTree::handleWheelEvent(WebCore::PlatformWheelEvent const&, WTF::OptionSet<WebCore::WheelEventProcessingSteps>)
6   0x14f04249a WebKit::RemoteLayerTreeEventDispatcher::internalHandleWheelEvent(WebCore::PlatformWheelEvent const&, WTF::OptionSet<WebCore::WheelEventProcessingSteps>)
7   0x14f042247 WebKit::RemoteLayerTreeEventDispatcher::scrollingThreadHandleWheelEvent(WebKit::WebWheelEvent const&, WebCore::RectEdges<bool>)
8   0x14f059ad8 WebKit::RemoteLayerTreeEventDispatcher::handleWheelEvent(WebKit::NativeWebWheelEvent const&, WebCore::RectEdges<bool>)::$_10::operator()() const
9   0x14f0599e9 WTF::Detail::CallableWrapper<WebKit::RemoteLayerTreeEventDispatcher::handleWheelEvent(WebKit::NativeWebWheelEvent const&, WebCore::RectEdges<bool>)::$_10, void>::call()

[Radar WebKit Bug Importer]

<rdar://problem/106664560>

[Simon Fraser (smfr)]

Pull request: https://github.com/WebKit/WebKit/pull/11462

[EWS]

Committed 261637@main (3e62e3f64bae): <https://commits.webkit.org/261637@main>

Reviewed commits have been landed. Closing PR #11462 and removing active labels.