210307 2020-04-09 14:49:14 -0700 REGRESSION: [ Mac Debug wk2 ] fast/events/scroll-subframe-in-rendering-update.html is a flaky crash 2020-04-09 15:11:58 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 210278 P2 Normal --- 1 tsavell webkit-unassigned oldest_to_newest 1639888 0 tsavell 2020-04-09 14:49:14 -0700 fast/events/scroll-subframe-in-rendering-update.html This test began crashing recently history: https://results.webkit.org/?suite=layout-tests&test=fast%2Fevents%2Fscroll-subframe-in-rendering-update.html Log: No crash log found for com.apple.WebKit.WebContent.Development:3321. stdout: stderr: ASSERTION FAILED: !needsLayout() ./page/FrameView.cpp(4276) : virtual void WebCore::FrameView::paintContents(WebCore::GraphicsContext &, const WebCore::IntRect &, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext *) 1 0x139f2b6d9 WTFCrash 2 0x11cbf6c0b WTFCrashWithInfo(int, char const*, char const*, int) 3 0x1202f0eb6 WebCore::FrameView::paintContents(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*) 4 0x1205698c4 WebCore::ScrollView::paint(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*) 5 0x120df40bb WebCore::RenderWidget::paintContents(WebCore::PaintInfo&, WebCore::LayoutPoint const&) 6 0x120df4977 WebCore::RenderWidget::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&) 7 0x120c79824 WebCore::RenderLayer::collectEventRegionForFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&) 8 0x120c75a2f WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) 9 0x120cc0c69 WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*)::$_5::operator()(WebCore::RenderLayer&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) const 10 0x120cc0522 WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*) 1639903 1 tsavell 2020-04-09 15:03:52 -0700 I was able to reproduce this crash using command: run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f --debug fast/events/scroll-subframe-in-rendering-update.html 1639914 2 tsavell 2020-04-09 15:11:58 -0700 *** This bug has been marked as a duplicate of bug 210278 ***