Created attachment 449913 [details] html that trigger crash 1. build a debug webkit 2. open html 3. crash ASSERTION FAILED: layoutState->renderer() == this ../../Source/WebCore/rendering/RenderBlock.cpp(2866) : virtual WebCore::LayoutUnit WebCore::RenderBlock::offsetFromLogicalTopOfFirstPage() const 1 0x7f235dcd7964 WTFReportBacktrace 2 0x7f235dcd7c01 WTFCrash 3 0x7f23777ceba1 WTF::CrashOnOverflow::overflowed() 4 0x7f2380f2a522 WebCore::RenderBlock::offsetFromLogicalTopOfFirstPage() const 5 0x7f2380f2ae62 WebCore::RenderBlock::computeFragmentRangeForBoxChild(WebCore::RenderBox const&) const 6 0x7f2380f2b2ca WebCore::RenderBlock::estimateFragmentRangeForBoxChild(WebCore::RenderBox const&) const 7 0x7f2380f0d18f WebCore::RenderBlock::layoutPositionedObject(WebCore::RenderBox&, bool, bool) 8 0x7f2380f0db11 WebCore::RenderBlock::layoutPositionedObjects(bool, bool) 9 0x7f2380fdfaa6 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) 10 0x7f2380f088ab WebCore::RenderBlock::layout() 11 0x7f2380fe1a40 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) 12 0x7f2380fe0c96 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) 13 0x7f2380fdefa4 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) 14 0x7f2380f088ab WebCore::RenderBlock::layout() 15 0x7f2380e4be9e WebCore::RenderElement::layoutIfNeeded() 16 0x7f2380ff97af WebCore::RenderBlockFlow::positionNewFloats() 17 0x7f2380fe3c54 WebCore::RenderBlockFlow::adjustFloatingBlock(WebCore::RenderBlockFlow::MarginInfo const&) 18 0x7f2380fe0c6c WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) 19 0x7f2380fdefa4 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) 20 0x7f2380f088ab WebCore::RenderBlock::layout() 21 0x7f2380fe1a40 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) 22 0x7f2380fe0c96 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) 23 0x7f2380fdefa4 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) 24 0x7f2380f088ab WebCore::RenderBlock::layout() 25 0x7f2380fe1a40 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) 26 0x7f2380fe0c96 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) 27 0x7f2380fdefa4 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) 28 0x7f2380f088ab WebCore::RenderBlock::layout() 29 0x7f2380fe1a40 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) 30 0x7f2380fe0c96 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) 31 0x7f2380fdefa4 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
<rdar://problem/88322109>