250907 2023-01-20 11:18:16 -0800 ASSERTION FAILED: !m_deferredScrollDelta platform/ScrollView.cpp(504) : virtual void WebCore::ScrollView::scrollTo(const WebCore::ScrollPosition &) 2026-06-04 23:18:12 -0700 1 1 1 Unclassified WebKit Layout and Rendering Safari Technology Preview Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ahmad.saleem792 csaavedra bfulgham karlcow simon.fraser webkit-bug-importer webkit zalan oldest_to_newest 1926984 0 ahmad.saleem792 2023-01-20 11:18:16 -0800 Hi Team, While going through GitHub Commits, I faced following assert on Debug Minibrowser WK2 based of259136@main on macOS 13.1: URL - https://github.com/WebKit/WebKit/commits/main > Go back and forth and on old patches and opening as drop down. I didn't find related bug so I am raising now: ASSERTION FAILED: !m_deferredScrollDelta platform/ScrollView.cpp(504) : virtual void WebCore::ScrollView::scrollTo(const WebCore::ScrollPosition &) 1 0x13a536d84 WTFCrash 2 0x280832730 WTFCrashWithInfo(int, char const*, char const*, int) 3 0x284df2364 WebCore::ScrollView::scrollTo(WebCore::IntPoint const&) 4 0x284af52d0 WebCore::FrameView::scrollTo(WebCore::IntPoint const&) 5 0x284df1adc WebCore::ScrollView::setScrollOffset(WebCore::IntPoint const&) 6 0x284df7e10 WebCore::ScrollableArea::scrollPositionChanged(WebCore::IntPoint const&) 7 0x284df7d70 WebCore::ScrollableArea::notifyScrollPositionChanged(WebCore::IntPoint const&) 8 0x284d13a60 WebCore::AsyncScrollingCoordinator::reconcileScrollingState(WebCore::FrameView&, WebCore::FloatPoint const&, std::__1::variant<std::__1::optional<WebCore::FloatPoint>, std::__1::optional<WebCore::FloatRect> > const&, WebCore::ScrollType, WebCore::ViewportRectStability, WebCore::ScrollingLayerPositionAction) 9 0x284d1371c WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll(unsigned long long, WebCore::FloatPoint const&, std::__1::optional<WebCore::FloatPoint>, WebCore::ScrollingLayerPositionAction, WebCore::ScrollType) 10 0x284d12e4c WebCore::AsyncScrollingCoordinator::applyScrollPositionUpdate(WebCore::ScrollUpdate&&, WebCore::ScrollType) 11 0x284d124f8 WebCore::AsyncScrollingCoordinator::applyScrollUpdate(WebCore::ScrollUpdate&&, WebCore::ScrollType) 12 0x284d122b8 WebCore::AsyncScrollingCoordinator::requestScrollPositionUpdate(WebCore::ScrollableArea&, WebCore::IntPoint const&, WebCore::ScrollType, WebCore::ScrollClamping) 13 0x284af1134 WebCore::FrameView::requestScrollPositionUpdate(WebCore::IntPoint const&, WebCore::ScrollType, WebCore::ScrollClamping) 14 0x284deb420 WebCore::ScrollableArea::setScrollPositionFromAnimation(WebCore::IntPoint const&) 15 0x284deb36c WebCore::ScrollAnimator::notifyPositionChanged(WebCore::FloatSize const&) 16 0x284dea9d0 WebCore::ScrollAnimator::setCurrentPosition(WebCore::FloatPoint const&, WebCore::ScrollAnimator::NotifyScrollableArea) 17 0x284dea920 WebCore::ScrollAnimator::scrollToPositionWithoutAnimation(WebCore::FloatPoint const&, WebCore::ScrollClamping) 18 0x284df7afc WebCore::ScrollableArea::scrollToPositionWithoutAnimation(WebCore::FloatPoint const&, WebCore::ScrollClamping) 19 0x284df3290 WebCore::ScrollView::updateScrollbars(WebCore::IntPoint const&)::$_6::operator()(WebCore::IntPoint) const 20 0x284df03f8 WebCore::ScrollView::updateScrollbars(WebCore::IntPoint const&) 21 0x284df1534 WebCore::ScrollView::setContentsSize(WebCore::IntSize const&) 22 0x284ae1cf0 WebCore::FrameView::setContentsSize(WebCore::IntSize const&) 23 0x284ad8c80 WebCore::FrameView::adjustViewSize() 24 0x284b2d0c4 WebCore::FrameViewLayoutContext::performLayout() 25 0x284b2c928 WebCore::FrameViewLayoutContext::layout() 26 0x283a7aad8 WebCore::Document::updateLayout() 27 0x283a80e4c WebCore::Document::updateLayoutIfDimensionsOutOfDate(WebCore::Element&, WebCore::DimensionsCheck) 28 0x283b67aa0 WebCore::Element::offsetWidth() 29 0x2810d7c78 WebCore::jsHTMLElement_offsetWidthGetter(JSC::JSGlobalObject&, WebCore::JSHTMLElement&) 30 0x280fc42d0 long long WebCore::IDLAttribute<WebCore::JSHTMLElement>::get<&(WebCore::jsHTMLElement_offsetWidthGetter(JSC::JSGlobalObject&, WebCore::JSHTMLElement&)), (WebCore::CastedThisErrorBehavior)3>(JSC::JSGlobalObject&, long long, JSC::PropertyName) 31 0x280fc41ac WebCore::jsHTMLElement_offsetWidth(JSC::JSGlobalObject*, long long, JSC::PropertyName) Thanks! 1927029 1 simon.fraser 2023-01-20 15:08:20 -0800 I have seen this assertion fairly recently. 1929005 2 webkit-bug-importer 2023-01-27 11:19:16 -0800 <rdar://problem/104753832> 2217225 3 csaavedra 2026-06-03 08:48:07 -0700 *** Bug 310596 has been marked as a duplicate of this bug. *** 2217226 4 csaavedra 2026-06-03 08:51:13 -0700 Pull request: https://github.com/WebKit/WebKit/pull/66374 2217907 5 ews-feeder 2026-06-04 23:18:10 -0700 Committed 314619@main (20aa31cf4f7e): <https://commits.webkit.org/314619@main> Reviewed commits have been landed. Closing PR #66374 and removing active labels.