233283 2021-11-17 14:17:00 -0800 [CSS Cascade Layers] [Debug] ASSERTION FAILED: m_childRules.isEmpty() when using @import with layer name 2021-11-19 09:09:42 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 233208 1 pangle koivisto esprehn+autocc ews-watchlist glenn graouts gyuyoung.kim koivisto macpherson menard webkit-bug-importer oldest_to_newest 1816113 0 444573 pangle 2021-11-17 14:17:00 -0800 Created attachment 444573 Reproduction Test Case In the process of writing tests for bug 233208, I've run into this assertion in debug builds when I `@import url("./external-layers.css") layer(imported);` in a style tag. I've attached a sample page and external stylesheet the reproduce the issue. The `@import` rule behaves as expected in release builds and imports the styles scoped within the named layer. Full crash trace: ``` ASSERTION FAILED: m_childRules.isEmpty() ./css/StyleSheetContents.cpp(146) : void WebCore::StyleSheetContents::parserAppendRule(Ref<WebCore::StyleRuleBase> &&) 1 0x4f43daf39 WTFCrash 2 0x506f89dcb WTFCrashWithInfo(int, char const*, char const*, int) 3 0x509dcb63c WebCore::StyleSheetContents::parserAppendRule(WTF::Ref<WebCore::StyleRuleBase, WTF::RawPtrTraits<WebCore::StyleRuleBase> >&&) 4 0x509e1b0f7 WebCore::CSSParserImpl::parseStyleSheet(WTF::String const&, WebCore::CSSParserContext const&, WebCore::StyleSheetContents&, WebCore::CSSParser::RuleParsing)::$_3::operator()(WTF::RefPtr<WebCore::StyleRuleBase, WTF::RawPtrTraits<WebCore::StyleRuleBase>, WTF::DefaultRefDerefTraits<WebCore::StyleRuleBase> >) const 5 0x509e0a011 bool WebCore::CSSParserImpl::consumeRuleList<WebCore::CSSParserImpl::parseStyleSheet(WTF::String const&, WebCore::CSSParserContext const&, WebCore::StyleSheetContents&, WebCore::CSSParser::RuleParsing)::$_3>(WebCore::CSSParserTokenRange, WebCore::CSSParserImpl::RuleListType, WebCore::CSSParserImpl::parseStyleSheet(WTF::String const&, WebCore::CSSParserContext const&, WebCore::StyleSheetContents&, WebCore::CSSParser::RuleParsing)::$_3) 6 0x509e004d1 WebCore::CSSParserImpl::parseStyleSheet(WTF::String const&, WebCore::CSSParserContext const&, WebCore::StyleSheetContents&, WebCore::CSSParser::RuleParsing) 7 0x509e0042b WebCore::CSSParser::parseSheet(WebCore::StyleSheetContents&, WTF::String const&, WebCore::CSSParser::RuleParsing) 8 0x509dcd72e WebCore::StyleSheetContents::parseString(WTF::String const&) 9 0x50a0d4cee WebCore::InlineStyleSheetOwner::createSheet(WebCore::Element&, WTF::String const&) 10 0x50a0d44fe WebCore::InlineStyleSheetOwner::createSheetFromTextContents(WebCore::Element&) 11 0x50a0d468b WebCore::InlineStyleSheetOwner::finishParsingChildren(WebCore::Element&) 12 0x50a4f4b13 WebCore::HTMLStyleElement::finishParsingChildren() 13 0x50a652a18 WebCore::HTMLElementStack::popCommon() 14 0x50a64de4a WebCore::HTMLElementStack::pop() 15 0x50a688f0d WebCore::HTMLTreeBuilder::processEndTag(WebCore::AtomHTMLToken&&) 16 0x50a6855f6 WebCore::HTMLTreeBuilder::processToken(WebCore::AtomHTMLToken&&) 17 0x50a684455 WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomHTMLToken&&) 18 0x50a650d79 WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) 19 0x50a650b20 WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) 20 0x50a64fd38 WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) 21 0x50a64f540 WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode) 22 0x50a651b27 WebCore::HTMLDocumentParser::resumeParsingAfterScriptExecution() 23 0x50a651ebc WebCore::HTMLDocumentParser::notifyFinished(WebCore::PendingScript&) 24 0x50a14a8da WebCore::PendingScript::notifyClientFinished() 25 0x50a14a939 WebCore::PendingScript::notifyFinished(WebCore::LoadableScript&) 26 0x50a0f2673 WebCore::LoadableScript::notifyClientFinished() 27 0x50a0f2493 WebCore::LoadableClassicScript::notifyFinished(WebCore::CachedResource&, WebCore::NetworkLoadMetrics const&) 28 0x50ababa2f WebCore::CachedResource::checkNotify(WebCore::NetworkLoadMetrics const&) 29 0x50ab9f934 WebCore::CachedResource::finishLoading(WebCore::SharedBuffer*, WebCore::NetworkLoadMetrics const&) 30 0x50abda78c WebCore::CachedScript::finishLoading(WebCore::SharedBuffer*, WebCore::NetworkLoadMetrics const&) 31 0x50ab30112 WebCore::SubresourceLoader::didFinishLoading(WebCore::NetworkLoadMetrics const&) ``` 1816116 1 webkit-bug-importer 2021-11-17 14:18:30 -0800 <rdar://problem/85520733> 1816799 2 444799 koivisto 2021-11-19 03:55:07 -0800 Created attachment 444799 Patch 1816808 3 444803 koivisto 2021-11-19 05:03:00 -0800 Created attachment 444803 Patch 1816884 4 ews-feeder 2021-11-19 09:09:39 -0800 Committed r286064 (244451@main): <https://commits.webkit.org/244451@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 444803. 444573 2021-11-17 14:17:00 -0800 2021-11-17 14:17:00 -0800 Reproduction Test Case cascade-layers-debug-crash-test.zip application/zip 1162 pangle UEsDBBQACAAIAO9wcVMAAAAAAAAAAM0AAAATACAAZXh0ZXJuYWwtbGF5ZXJzLmNzc1VUDQAHIn2V Yeh9lWHnfZVhdXgLAAEE9QEAAAQUAAAAc8hJrEwtUkhKLE7VUSguSE3OTMyx5uJyKC4tKMgvKinW SM7PyS+yUihKTdFUqOZSAAIHiBaoYqggCOhl5oL0pKYgiYEA1IiUxKLs4pzEktT0osRKa7iKWi4I WQu0FeEYqBHYjIQal5uZV5JclJqYaw03AABQSwcIs83I4nQAAADNAAAAUEsDBBQACAAIAFJxcVMA AAAAAAAAAPsCAAAQACAAbGF5ZXItY3Jhc2guaHRtbFVUDQAH3H2VYdx9lWHvfZVhdXgLAAEE9QEA AAQUAAAAjVLBboQgEL37FZSTJlu9V9Y0aXtuD3vpkZWxkiIYwG1N03+vKCprdpudA4SZ92bmDUPu nl+fDu9vL6i2jSgiMl9A2XAZ2wsoIjTYo6A9aPQzPpylVCrZN6ozgdNZqYTSD0hAo2RZ86pSMl8A v9F0hjl50yptge3QkRrYIdNCyanIPWgKo06LGKcZfFvQkor7kWvS0hicoPERz4mSmWq61nlM7HvS Qyzo1tf39TYyUm6h2fhCefRLfmiAQNuq75pSpy8c4YUSPn0LtKzbrqr+H93t38Go/jxxJcBeybht Zh1Z7mEk8/tAMr8fR8V6pKRQlO2x7uQBjI0TPG0MYfyE+BCQSjdUYFQKasweuzq4INkQ3gDn/zuD 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