214483 2020-07-17 10:24:26 -0700 REGRESSION (r264190?): ASSERTION FAILED: !needsLayout() on tiled-drawing/scrolling/fast-scroll-iframe-latched-select.html 2020-07-23 17:02:41 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=214651 InRadar P2 Normal --- 1 tsavell webkit-unassigned bfulgham simon.fraser webkit-bot-watchers-bugzilla webkit-bug-importer zalan oldest_to_newest 1672534 0 tsavell 2020-07-17 10:24:26 -0700 tiled-drawing/scrolling/fast-scroll-iframe-latched-select.html This test is a flaky crash on Mac wk2 History: https://results.webkit.org/?suite=layout-tests&test=tiled-drawing%2Fscrolling%2Ffast-scroll-iframe-latched-select.html Crash Log: CRASHING TEST: tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe.html Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.JavaScriptCore 0x00000002d3de75de WTFCrash + 14 (Assertions.cpp:295) 1 com.apple.WebCore 0x00000002b5a91cfb WTFCrashWithInfo(int, char const*, char const*, int) + 27 2 com.apple.WebCore 0x00000002b9f8fb4b WebCore::RenderView::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&) + 123 (RenderView.cpp:306) 3 com.apple.WebCore 0x00000002b9e39748 WebCore::RenderLayer::paintBackgroundForFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebCore::GraphicsContext&, WebCore::GraphicsContext&, WebCore::LayoutRect const&, bool, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RenderObject*) + 648 (RenderLayer.cpp:5029) 4 com.apple.WebCore 0x00000002b9e359ae WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) + 2574 (RenderLayer.cpp:4676) 5 com.apple.WebCore 0x00000002b9e590fd WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::EventRegionContext*)::$_21::operator() 1672536 1 webkit-bug-importer 2020-07-17 10:24:44 -0700 <rdar://problem/65732154> 1672809 2 ap 2020-07-18 11:05:35 -0700 This has very rarely happened on internal bots before, but very sharply became frequent on 2020-07-09. Possibly https://trac.webkit.org/r264190