211159 2020-04-28 17:55:53 -0700 Specific dom node order of Shadow DOM (re)projection causes crash 2020-05-01 07:35:17 -0700 1 1 1 Unclassified WebKit DOM Safari 13 Mac macOS 10.15 RESOLVED FIXED InRadar P2 Normal --- 1 emarquez webkit-unassigned cdumez dfreedm esprehn+autocc ews-watchlist florian kangil.han koivisto rniwa webkit-bug-importer zalan oldest_to_newest 1646783 0 397914 emarquez 2020-04-28 17:55:53 -0700 Created attachment 397914 Reproduction of failure Hello, there seems to be some mix of issues projecting a <slot>'s default content into a shadow root that has both a named and nameless slot. I have attached a reproduction case and here is a JSbin for a live example: https://jsbin.com/qicoganici/1/edit Some quirks I've found: Removing the named slot: <div> <slot></slot> </div> moving it into the same div as the nameless slot: <div> <slot name="named"></slot> <slot></slot> </div> or moving it after the nameless slot: <div> <slot></slot> </div> <slot name="named"></slot> seems to prevent this crash. Additionally, removing the default content (the text node "default" in this example): <my-element-inner> <slot></slot> <div slot="named">named slot<div> </my-element-inner> wrapping the slot in the outer element with a span or div: <my-element-inner> <span><slot>default</slot></span> <div slot="named">named slot<div> </my-element-inner> or actually projecting a value into the outer element: <my-element-outer>projected</my-element-outer> also seems to prevent this crash as well. Notably, simply wrapping the named slot in an element: <div> <slot name="named"></slot> </div> <div> <slot></slot> </div> does not prevent this crash. Confirm this crash on Safari 13.1 (WK: 156609.1.20.111.8) and 13.2 (WK: 15610.1.10) 1647228 1 ap 2020-04-29 17:57:52 -0700 Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.WebCore 0x00007fff40c872a3 WebCore::RenderTreeBuilder::Block::attachIgnoringContinuation(WebCore::RenderBlock&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 67 1 com.apple.WebCore 0x00007fff40c86f56 WebCore::RenderTreeBuilder::Block::attach(WebCore::RenderBlock&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 86 2 com.apple.WebCore 0x00007fff40c8ae4a WebCore::RenderTreeBuilder::BlockFlow::attach(WebCore::RenderBlockFlow&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 298 3 com.apple.WebCore 0x00007fff40c86d7b WebCore::RenderTreeBuilder::attach(WebCore::RenderElement&, std::__1::unique_ptr<WebCore::RenderObject, WebCore::RenderObjectDeleter>, WebCore::RenderObject*) + 1739 4 com.apple.WebCore 0x00007fff40c96d08 WebCore::RenderTreeUpdater::commit(std::__1::unique_ptr<WebCore::Style::Update const, std::__1::default_delete<WebCore::Style::Update const> >) + 5912 5 com.apple.WebCore 0x00007fff4024f89c WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType) + 1468 6 com.apple.WebCore 0x00007fff3ef6d044 WebCore::Document::updateStyleIfNeeded() + 468 7 com.apple.WebCore 0x00007fff3ef6cb0b WebCore::Document::finishedParsing() + 539 8 com.apple.WebCore 0x00007fff3ef641b4 WebCore::HTMLDocumentParser::prepareToStopParsing() + 196 9 com.apple.WebCore 0x00007fff3ef63ed4 WebCore::HTMLDocumentParser::finish() + 388 10 com.apple.WebCore 0x00007fff406eff21 WebCore::DocumentLoader::finishedLoading() + 545 11 com.apple.WebCore 0x00007fff3efce24c WebCore::CachedResource::checkNotify() + 92 12 com.apple.WebCore 0x00007fff4077d099 WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) + 1241 1647229 2 webkit-bug-importer 2020-04-29 17:58:04 -0700 <rdar://problem/62626920> 1647825 3 398176 koivisto 2020-05-01 06:26:18 -0700 Created attachment 398176 patch 1647840 4 ews-feeder 2020-05-01 07:35:16 -0700 Committed r260997: <https://trac.webkit.org/changeset/260997> All reviewed patches have been landed. Closing bug and clearing flags on attachment 398176. 397914 2020-04-28 17:55:53 -0700 2020-04-28 17:55:53 -0700 Reproduction of failure safari-segfault.html text/html 4609 emarquez PCFET0NUWVBFIGh0bWwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMDEvL0VOIiAiaHR0cDov L3d3dy53My5vcmcvVFIvaHRtbDQvc3RyaWN0LmR0ZCI+CjxodG1sPgo8aGVhZD4KICA8bWV0YSBo dHRwLWVxdWl2PSJDb250ZW50LVR5cGUiIGNvbnRlbnQ9InRleHQvaHRtbDsgY2hhcnNldD11dGYt OCI+CiAgPG1ldGEgaHR0cC1lcXVpdj0iQ29udGVudC1TdHlsZS1UeXBlIiBjb250ZW50PSJ0ZXh0 L2NzcyI+CiAgPHRpdGxlPjwvdGl0bGU+CiAgPG1ldGEgbmFtZT0iR2VuZXJhdG9yIiBjb250ZW50 PSJDb2NvYSBIVE1MIFdyaXRlciI+CiAgPG1ldGEgbmFtZT0iQ29jb2FWZXJzaW9uIiBjb250ZW50 PSIxODk0LjQiPgogIDxzdHlsZSB0eXBlPSJ0ZXh0L2NzcyI+CiAgICBwLnAxIHttYXJnaW46IDAu MHB4IDAuMHB4IDAuMHB4IDAuMHB4OyBmb250OiAxMi4wcHggVGltZXM7IGNvbG9yOiAjMDAwMDAw OyAtd2Via2l0LXRleHQtc3Ryb2tlOiAjMDAwMDAwfQogICAgcC5wMiB7bWFyZ2luOiAwLjBweCAw LjBweCAwLjBweCAwLjBweDsgZm9udDogMTIuMHB4IFRpbWVzOyBjb2xvcjogIzAwMDAwMDsgLXdl 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