212116 2020-05-19 17:53:30 -0700 Nullptr deref in WebCore::RenderTreeBuilder::Block::attachIgnoringContinuation when parent and beforeChild are siblings 2020-05-22 21:03:25 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 shihchieh_lee zalan bfulgham changseok esprehn+autocc ews-feeder ews-watchlist ggaren glenn kondapallykalyan pdr product-security simon.fraser webkit-bug-importer zalan oldest_to_newest 1654265 0 shihchieh_lee 2020-05-19 17:53:30 -0700 <rdar://62993844> 0 com.apple.WebCore 0x0000000107af46f3 WebCore::RenderTreeBuilder::Block::attachIgnoringContinuation(WebCore::RenderBlock&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 51 1 com.apple.WebCore 0x0000000107af3e15 WebCore::RenderTreeBuilder::Block::attach(WebCore::RenderBlock&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 421 2 com.apple.WebCore 0x0000000107af3bfa WebCore::RenderTreeBuilder::BlockFlow::attach(WebCore::RenderBlockFlow&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 426 3 com.apple.WebCore 0x0000000107af3836 WebCore::RenderTreeBuilder::attachInternal(WebCore::RenderElement&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 2278 4 com.apple.WebCore 0x0000000107af3b89 WebCore::RenderTreeBuilder::BlockFlow::attach(WebCore::RenderBlockFlow&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 313 5 com.apple.WebCore 0x0000000107af3836 WebCore::RenderTreeBuilder::attachInternal(WebCore::RenderElement&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 2278 6 com.apple.WebCore 0x0000000107afe8bc WebCore::RenderTreeBuilder::MultiColumn::multiColumnDescendantInserted(WebCore::RenderMultiColumnFlow&, WebCore::RenderObject&) + 2476 7 com.apple.WebCore 0x0000000107af6ae3 WebCore::RenderTreeBuilder::attachToRenderElementInternal(WebCore::RenderElement&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 355 8 com.apple.WebCore 0x0000000107af4071 WebCore::RenderTreeBuilder::attachToRenderElement(WebCore::RenderElement&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 353 9 com.apple.WebCore 0x0000000107af48df WebCore::RenderTreeBuilder::Block::attachIgnoringContinuation(WebCore::RenderBlock&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 543 10 com.apple.WebCore 0x0000000107af3e15 WebCore::RenderTreeBuilder::Block::attach(WebCore::RenderBlock&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 421 11 com.apple.WebCore 0x0000000107af3bfa WebCore::RenderTreeBuilder::BlockFlow::attach(WebCore::RenderBlockFlow&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 426 12 com.apple.WebCore 0x0000000107af3836 WebCore::RenderTreeBuilder::attachInternal(WebCore::RenderElement&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 2278 13 com.apple.WebCore 0x0000000107afba88 WebCore::RenderTreeBuilder::Inline::splitFlow(WebCore::RenderInline&, WebCore::RenderObject*, std::__1::unique_ptr<WebCore::RenderBlock, WebCore::RenderObjectDeleter>, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderBoxModelObject*) + 2200 14 com.apple.WebCore 0x0000000107af742e WebCore::RenderTreeBuilder::normalizeTreeAfterStyleChange(WebCore::RenderElement&, WebCore::RenderStyle&) + 1166 15 com.apple.WebCore 0x0000000107b05754 WebCore::RenderTreeUpdater::updateRendererStyle(WebCore::RenderElement&, WebCore::RenderStyle&&, WebCore::StyleDifference) + 164 16 com.apple.WebCore 0x0000000107b0508d WebCore::RenderTreeUpdater::updateElementRenderer(WebCore::Element&, WebCore::Style::ElementUpdate const&) + 1293 17 com.apple.WebCore 0x0000000107b03634 WebCore::RenderTreeUpdater::commit(std::__1::unique_ptr<WebCore::Style::Update const, std::__1::default_delete<WebCore::Style::Update const> >) + 2404 18 com.apple.WebCore 0x00000001070fa635 WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType) + 1381 19 com.apple.WebCore 0x0000000105dd9154 WebCore::Document::updateStyleIfNeeded() + 468 20 com.apple.WebCore 0x0000000105e4fc68 WebCore::Document::updateLayout() + 360 1654266 1 shihchieh_lee 2020-05-19 17:55:14 -0700 Test case: <style> ol { position: fixed; } ol, body { -webkit-columns: 2; } </style> <script> function run() { q.appendChild(ol); window.requestIdleCallback(idleCallback); } function idleCallback() { range = document.createElement("main").ownerDocument.createRange(); range.setEndBefore(li); range.extractContents(); } </script> <body onload=run()><ol id=ol><li id=li style="border-top-width: medium; column-span: all;"></ol><q id=q></q> 1654276 2 shihchieh_lee 2020-05-19 18:29:36 -0700 Minimized test case: <style> ol { position: fixed; } ol, body { -webkit-columns: 2; } </style> <script> function run() { range = document.createElement("main").ownerDocument.createRange(); range.setEndBefore(li); range.extractContents(); } </script> <body onload=run()><q><ol><li id=li style="column-span: all;"></ol></q> 1654282 3 shihchieh_lee 2020-05-19 18:56:58 -0700 Cause of the crash: 1. After the document is loaded, updateStyleIfNeeded is called and render tree is being updated. 2. When walking through the nodes in updateRenderTree(), we find that OL is not inline and needs to be splitter and be attached to a RenderBlock. 3. In RenderTreeBuilder::BlockFlow::attach() we find that OL has multiColumnFlow, so we call RenderTreeBuilder::Block::attachIgnoringContinuation() and pass the RenderMultiColumnFlowThread in OL as parent and RenderMultiColumnSet as before child. 4. In Block::attachIgnoringContinuation(), we try to find the immediate child of parent by looking at ancestors of RenderMultiColumnSet. 5. However, since RenderMultiColumnFlowThread and RenderMultiColumnSet are siblings, the logic exhausts the render tree and deref nullptr. Step 2: childBecameNonInline: parent=0x542fe00b0, child=0x542fe0400, beforeChild=0x542fe0c30 (B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout B---YGLC -+ RenderView at (0,0) size 0x0 renderer->(0x542f5d210) layout->[normal child][positioned child] B-----L- -+ HTML RenderBlock at (0,0) size 0x0 renderer->(0x542f5d6c0) node->(0x542f5f800) layout->[self][normal child] B------- -+ BODY RenderBody at (0,0) size 0x0 renderer->(0x542f5d7f0) node->(0x542f5fc30) layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0f20) [Rs:0x0 Re:0x0] layout->[self][normal child] I------- -+* Q RenderInline renderer->(0x542fe00b0) node->(0x542f5fcc0) continuation->(0x542fe1610) layout->[self][normal child] I----G-- -+ <pseudo> RenderInline renderer->(0x542fe0190) node->(0x542f5fee0) layout->[self][normal child] I---YG-- -+ RenderQuote renderer->(0x542fe0270) layout->[self][normal child] I---YG-- -+ RenderText renderer->(0x542fe0360) layout->[self] B------- -+ OL RenderBlock at (0,0) size 0x0 renderer->(0x542fe0400) node->(0x542f5fd50) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0790) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderMultiColumnSpannerPlaceholder at (0,0) size 0x0 renderer->(0x542fe0980) [Rs:0x0 Re:0x0] layout->[self] B------- -+ LI RenderListItem at (0,0) size 0x0 renderer->(0x542fe0530) node->(0x542f5fdf0) [Rs:0x0 Re:0x0] layout->[self][normal child] I---YG-- -+ RenderListMarker at (0,0) size 0x0 renderer->(0x542fe0670) layout->[self] B---YG-- -+ RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe0a90) [Rs:0x0 Re:0x0] layout->[self] I----G-- -+ <pseudo> RenderInline renderer->(0x542fe0c30) node->(0x542fe0010) layout->[self][normal child] I---YG-- -+ RenderQuote renderer->(0x542fe0d10) layout->[self][normal child] I---YG-- -+ RenderText renderer->(0x542fe0e00) layout->[self] I------- -+ #text RenderText renderer->(0x542fe0ea0) node->(0x542f5fe80) length->(1) "\n" layout->[self] B---YG-- -+ RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe1110) layout->[self] Step 3: BlockFlow::attach: parent=0x542fe0400, child=0x542fe1a80, beforeChild=0x542fe0a90 (B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout B---YGLC -+ RenderView at (0,0) size 0x0 renderer->(0x542f5d210) layout->[normal child][positioned child] B-----L- -+ HTML RenderBlock at (0,0) size 0x0 renderer->(0x542f5d6c0) node->(0x542f5f800) layout->[self][normal child] B------- -+ BODY RenderBody at (0,0) size 0x0 renderer->(0x542f5d7f0) node->(0x542f5fc30) layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0f20) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderBlock at (0,0) size 0x0 renderer->(0x542fe1740) [Rs:0x0 Re:0x0] layout->[self][normal child] I------- -+ Q RenderInline renderer->(0x542fe00b0) node->(0x542f5fcc0) continuation->(0x542fe1610) layout->[self][normal child] I----G-- -+ <pseudo> RenderInline renderer->(0x542fe0190) node->(0x542f5fee0) layout->[self][normal child] I---YG-- -+ RenderQuote renderer->(0x542fe0270) layout->[self][normal child] I---YG-- -+ RenderText renderer->(0x542fe0360) layout->[self] B---YG-- -+ RenderBlock at (0,0) size 0x0 renderer->(0x542fe1610) continuation->(0x542fe19a0) [Rs:0x0 Re:0x0] layout->[self] B------- -+ OL RenderBlock at (0,0) size 0x0 renderer->(0x542fe0400) node->(0x542f5fd50) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0790) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderMultiColumnSpannerPlaceholder at (0,0) size 0x0 renderer->(0x542fe0980) [Rs:0x0 Re:0x0] layout->[self] B------- -+ LI RenderListItem at (0,0) size 0x0 renderer->(0x542fe0530) node->(0x542f5fdf0) [Rs:0x0 Re:0x0] layout->[self][normal child] I---YG-- -+ RenderListMarker at (0,0) size 0x0 renderer->(0x542fe0670) [Rs:0x0 Re:0x0] layout->[self] B---YG-- -+* RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe0a90) [Rs:0x0 Re:0x0] layout->[self] B---YG-- -+ RenderBlock at (0,0) size 0x0 renderer->(0x542fe1870) [Rs:0x0 Re:0x0] layout->[self][normal child] I------- -+ Q RenderInline renderer->(0x542fe19a0) node->(0x542f5fcc0) layout->[self][normal child] I----G-- -+ <pseudo> RenderInline renderer->(0x542fe0c30) node->(0x542fe0010) layout->[self][normal child] I---YG-- -+ RenderQuote renderer->(0x542fe0d10) layout->[self][normal child] I---YG-- -+ RenderText renderer->(0x542fe0e00) layout->[self] I------- -+ #text RenderText renderer->(0x542fe0ea0) node->(0x542f5fe80) length->(1) "\n" layout->[self] B---YG-- -+ RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe1110) layout->[self] Step 4: beforeChildContainer = 0x0, parent = 0x542fe0790, beforeChild = 0x542fe0a90 (B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout B---YGLC -+ RenderView at (0,0) size 0x0 renderer->(0x542f5d210) layout->[normal child][positioned child] B-----L- -+ HTML RenderBlock at (0,0) size 0x0 renderer->(0x542f5d6c0) node->(0x542f5f800) layout->[self][normal child] B------- -+ BODY RenderBody at (0,0) size 0x0 renderer->(0x542f5d7f0) node->(0x542f5fc30) layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0f20) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderBlock at (0,0) size 0x0 renderer->(0x542fe1740) [Rs:0x0 Re:0x0] layout->[self][normal child] I------- -+ Q RenderInline renderer->(0x542fe00b0) node->(0x542f5fcc0) continuation->(0x542fe1610) layout->[self][normal child] I----G-- -+ <pseudo> RenderInline renderer->(0x542fe0190) node->(0x542f5fee0) layout->[self][normal child] I---YG-- -+ RenderQuote renderer->(0x542fe0270) layout->[self][normal child] I---YG-- -+ RenderText renderer->(0x542fe0360) layout->[self] B---YG-- -+ RenderBlock at (0,0) size 0x0 renderer->(0x542fe1610) continuation->(0x542fe19a0) [Rs:0x0 Re:0x0] layout->[self] B------- -+ OL RenderBlock at (0,0) size 0x0 renderer->(0x542fe0400) node->(0x542f5fd50) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0790) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderMultiColumnSpannerPlaceholder at (0,0) size 0x0 renderer->(0x542fe0980) [Rs:0x0 Re:0x0] layout->[self] B------- -+ LI RenderListItem at (0,0) size 0x0 renderer->(0x542fe0530) node->(0x542f5fdf0) [Rs:0x0 Re:0x0] layout->[self][normal child] I---YG-- -+ RenderListMarker at (0,0) size 0x0 renderer->(0x542fe0670) [Rs:0x0 Re:0x0] layout->[self] B---YG-- -+* RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe0a90) [Rs:0x0 Re:0x0] layout->[self] B---YG-- -+ RenderBlock at (0,0) size 0x0 renderer->(0x542fe1870) [Rs:0x0 Re:0x0] layout->[self][normal child] I------- -+ Q RenderInline renderer->(0x542fe19a0) node->(0x542f5fcc0) layout->[self][normal child] I----G-- -+ <pseudo> RenderInline renderer->(0x542fe0c30) node->(0x542fe0010) layout->[self][normal child] I---YG-- -+ RenderQuote renderer->(0x542fe0d10) layout->[self][normal child] I---YG-- -+ RenderText renderer->(0x542fe0e00) layout->[self] I------- -+ #text RenderText renderer->(0x542fe0ea0) node->(0x542f5fe80) length->(1) "\n" layout->[self] B---YG-- -+ RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe1110) layout->[self] 1654304 4 399802 shihchieh_lee 2020-05-19 20:45:34 -0700 Created attachment 399802 Patch 1654305 5 shihchieh_lee 2020-05-19 20:52:33 -0700 The patch is for discussion. In this patch, beforeChild is set to nullptr before calling m_builder.attach to avoid passing siblings as parent and beforeChild. However, doing so triggers the assertion below: ASSERTION FAILED: !flow.spannerMap().get(placeholder.spanner()) ./rendering/updating/RenderTreeBuilderMultiColumn.cpp(270) : void WebCore::RenderTreeBuilder::MultiColumn::multiColumnDescendantInserted(WebCore::RenderMultiColumnFlow &, WebCore::RenderObject &) If the code returns without calling m_builder.attach, there is no assertion or crash. (In reply to Jack from comment #4) > Created attachment 399802 [details] > Patch 1654314 6 399802 ggaren 2020-05-19 21:13:30 -0700 Comment on attachment 399802 Patch Looks like EWS tests are crashing. 1654324 7 399802 zalan 2020-05-19 21:53:15 -0700 Comment on attachment 399802 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=399802&action=review > Source/WebCore/rendering/updating/RenderTreeBuilderBlockFlow.cpp:47 > + if (beforeChild->parent() == &parent) > + beforeChild = nullptr; This clearly needs some explanation. In many cases (probably the most common) the beforeChild's parent is the host for the insertion point. 1654461 8 shihchieh_lee 2020-05-20 08:56:07 -0700 Thanks. Yeah, this patch is to demonstrate the test case. Please see the complete render tree dump in comment #3. In this case we are passing parent.multiColumnFlow() and beforeChild to m_builder.attach. if (parent.multiColumnFlow() && (!parent.isFieldset() || !child->isLegend())) { ... return m_builder.attach(*parent.multiColumnFlow(), WTFMove(child), beforeChild); } And the render tree show that parent.multiColumnFlow() and beforeChild are siblings. BlockFlow::attach: parent=0x542fe0400, child=0x542fe1a80, beforeChild=0x542fe0a90 B------- -+ OL RenderBlock at (0,0) size 0x0 renderer->(0x542fe0400) node->(0x542f5fd50) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0790) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderMultiColumnSpannerPlaceholder at (0,0) size 0x0 renderer->(0x542fe0980) [Rs:0x0 Re:0x0] layout->[self] B------- -+ LI RenderListItem at (0,0) size 0x0 renderer->(0x542fe0530) node->(0x542f5fdf0) [Rs:0x0 Re:0x0] layout->[self][normal child] I---YG-- -+ RenderListMarker at (0,0) size 0x0 renderer->(0x542fe0670) [Rs:0x0 Re:0x0] layout->[self] B---YG-- -+* RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe0a90) [Rs:0x0 Re:0x0] layout->[self] And when the code enters RenderTreeBuilder::Block::attachIgnoringContinuation(), the following while loop will exhaust the ancestors and crashes when beforeChildContainer becomes nullptr. if (beforeChild && beforeChild->parent() != &parent) { RenderElement* beforeChildContainer = beforeChild->parent(); while (beforeChildContainer->parent() != &parent) beforeChildContainer = beforeChildContainer->parent(); (In reply to zalan from comment #7) > Comment on attachment 399802 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=399802&action=review > > > Source/WebCore/rendering/updating/RenderTreeBuilderBlockFlow.cpp:47 > > + if (beforeChild->parent() == &parent) > > + beforeChild = nullptr; > > This clearly needs some explanation. In many cases (probably the most > common) the beforeChild's parent is the host for the insertion point. 1654474 9 shihchieh_lee 2020-05-20 09:17:44 -0700 Besides, I was wondering if RenderTreeBuilder::attachInternal should move beforeChild to the RenderMultiColumnSpannerPlaceholder since it is the child of RenderMultiColumnFlowThread? B------- -+ OL RenderBlock at (0,0) size 0x0 renderer->(0x542fe0400) node->(0x542f5fd50) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YGL- -+ RenderMultiColumnFlowThread at (0,0) size 0x0 renderer->(0x542fe0790) [Rs:0x0 Re:0x0] layout->[self][normal child] B---YG-- -+ RenderMultiColumnSpannerPlaceholder at (0,0) size 0x0 renderer->(0x542fe0980) [Rs:0x0 Re:0x0] layout->[self] B------- -+ LI RenderListItem at (0,0) size 0x0 renderer->(0x542fe0530) node->(0x542f5fdf0) [Rs:0x0 Re:0x0] layout->[self][normal child] I---YG-- -+ RenderListMarker at (0,0) size 0x0 renderer->(0x542fe0670) [Rs:0x0 Re:0x0] layout->[self] B---YG-- -+* RenderMultiColumnSet at (0,0) size 0x0 renderer->(0x542fe0a90) [Rs:0x0 Re:0x0] layout->[self] However, in the following code, findColumnSpannerPlaceholder cannot find the spanner in the spannerMap so return nullptr, therefore beforeChild is not moved to spannerPlaceholder. } else if (is<RenderBox>(beforeChild)) { // Adjust the beforeChild if it happens to be a spanner and the its actual location is inside the fragmented flow. auto& beforeChildBox = downcast<RenderBox>(*beforeChild); if (auto* enclosingFragmentedFlow = parent.enclosingFragmentedFlow()) { auto columnSpannerPlaceholderForBeforeChild = [&]() -> RenderMultiColumnSpannerPlaceholder* { if (!is<RenderMultiColumnFlow>(enclosingFragmentedFlow)) return nullptr; auto& multiColumnFlow = downcast<RenderMultiColumnFlow>(*enclosingFragmentedFlow); return multiColumnFlow.findColumnSpannerPlaceholder(&beforeChildBox); }; if (auto* spannerPlaceholder = columnSpannerPlaceholderForBeforeChild()) beforeChild = spannerPlaceholder; } } 1654482 10 shihchieh_lee 2020-05-20 09:38:42 -0700 It seems there is something wrong when we pass siblings as parent and beforeChild into RenderTreeBuilder::Block::attachIgnoringContinuation since it assumes that parent needs to be an ancestor of beforeChild, otherwise many places in that function would assert or crash. Does this seem like a case that we need to support, or just a corner case that a patch is enough? The simplest patch is to bail out in attachIgnoringContinuation when the while loop exhaust ancestors. 1654492 11 399848 shihchieh_lee 2020-05-20 09:55:36 -0700 Created attachment 399848 Patch 1655435 12 399848 zalan 2020-05-22 14:19:42 -0700 Comment on attachment 399848 Patch This is papering over the real issue (not clearing the inner fragmented context when the column style gets unset). 1655436 13 400075 zalan 2020-05-22 14:20:27 -0700 Created attachment 400075 Test reduction 1655497 14 zalan 2020-05-22 16:48:16 -0700 <rdar://problem/62993844> 1655529 15 400095 zalan 2020-05-22 17:25:13 -0700 Created attachment 400095 Patch 1655551 16 400095 simon.fraser 2020-05-22 18:42:02 -0700 Comment on attachment 400095 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=400095&action=review > LayoutTests/fast/multicol/nested-multicol-with-spanner-and-continuation.html:3 > + -webkit-columns: 2; Is the prefix required? 1655556 17 zalan 2020-05-22 19:07:05 -0700 (In reply to Simon Fraser (smfr) from comment #16) > Comment on attachment 400095 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=400095&action=review > > > LayoutTests/fast/multicol/nested-multicol-with-spanner-and-continuation.html:3 > > + -webkit-columns: 2; > > Is the prefix required? Yeah, certainly not Thanks. 1655567 18 400105 zalan 2020-05-22 20:30:54 -0700 Created attachment 400105 Patch 1655570 19 ews-feeder 2020-05-22 21:03:24 -0700 Committed r262093: <https://trac.webkit.org/changeset/262093> All reviewed patches have been landed. Closing bug and clearing flags on attachment 400105. 399802 2020-05-19 20:45:34 -0700 2020-05-20 09:55:33 -0700 Patch bug-212116-20200519204533.patch text/plain 1710 shihchieh_lee U3VidmVyc2lvbiBSZXZpc2lvbjogMjYxNzA2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNWZhN2FhZjUwNDUxYWUx OTYxMWQxNTRhNDFmOGNiMWI2NWVhODkzMy4uYzM0YTFkYWE2ZTgzOWY0ODQ2ODRlMmRmNDhiN2Mx YjA2ZmM2ZTliZSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE1IEBACisyMDIwLTA1LTE5ICBKYWNr IExlZSAgPHNoaWhjaGllaF9sZWVAYXBwbGUuY29tPgorCisgICAgICAgIE51bGxwdHIgZGVyZWYg aW4gV2ViQ29yZTo6UmVuZGVyVHJlZUJ1aWxkZXI6OkJsb2NrOjphdHRhY2hJZ25vcmluZ0NvbnRp bnVhdGlvbiB3aGVuIHBhcmVudCBhbmQgYmVmb3JlQ2hpbGQgYXJlIHNpYmxpbmdzCisgICAgICAg IGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMTIxMTYKKworICAgICAg ICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBObyBuZXcgdGVzdHMgKE9P 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