Load the attached test with debug WebKitTestRunner: Checked version: f368f1d OS: Darwin-15.6.0-x86_64-i386-64bit <math display="block"><mfenced><mfrac> Backtrace: ASSERTION FAILED: !isAnonymous() WebKit/Source/WebCore/rendering/mathml/RenderMathMLOperator.cpp(257) : virtual void WebCore::RenderMathMLOperator::updateTokenContent() 1 0x118fc6c71 WTFCrash 2 0x122e34756 WebCore::RenderMathMLOperator::updateTokenContent() 3 0x121f0babd WebCore::MathMLStyle::updateStyleIfNeeded(WebCore::RenderObject*, bool, WebCore::MathMLElement::MathVariant) 4 0x121f0b2a7 WebCore::MathMLStyle::resolveMathMLStyle(WebCore::RenderObject*) 5 0x121f0ae9a WebCore::MathMLStyle::resolveMathMLStyleTree(WebCore::RenderObject*) 6 0x121ef7d03 WebCore::MathMLMathElement::didAttachRenderers() 7 0x12324d0af WebCore::RenderTreeUpdater::popParent() 8 0x12324b24f WebCore::RenderTreeUpdater::popParentsToDepth(unsigned int) 9 0x12324ac8a WebCore::RenderTreeUpdater::updateRenderTree(WebCore::ContainerNode&) 10 0x12324a2bf WebCore::RenderTreeUpdater::commit(std::__1::unique_ptr<WebCore::Style::Update, std::__1::default_delete<WebCore::Style::Update> >) 11 0x11e77e3a9 WebCore::Document::recalcStyle(WebCore::Style::Change) 12 0x11e7688cb WebCore::Document::updateStyleIfNeeded() 13 0x11f55ed4f WebCore::HTMLEmbedElement::parseAttribute(WebCore::QualifiedName const&, WTF::AtomicString const&) 14 0x11eb54fd1 WebCore::Element::attributeChanged(WebCore::QualifiedName const&, WTF::AtomicString const&, WTF::AtomicString const&, WebCore::Element::AttributeModificationReason) 15 0x123b44e4f WebCore::StyledElement::attributeChanged(WebCore::QualifiedName const&, WTF::AtomicString const&, WTF::AtomicString const&, WebCore::Element::AttributeModificationReason) 16 0x11eb56963 WebCore::Element::parserSetAttributes(WTF::Vector<WebCore::Attribute, 0ul, WTF::CrashOnOverflow, 16ul> const&) 17 0x11f493dad WebCore::setAttributes(WebCore::Element&, WTF::Vector<WebCore::Attribute, 0ul, WTF::CrashOnOverflow, 16ul>&, WebCore::ParserContentPolicy) 18 0x11f490656 WebCore::setAttributes(WebCore::Element&, WebCore::AtomicHTMLToken&, WebCore::ParserContentPolicy) 19 0x11f49393c WebCore::HTMLConstructionSite::createHTMLElementOrFindCustomElementInterface(WebCore::AtomicHTMLToken&, WebCore::JSCustomElementInterface**) 20 0x11f492102 WebCore::HTMLConstructionSite::createHTMLElement(WebCore::AtomicHTMLToken&) 21 0x11f493f1c WebCore::HTMLConstructionSite::insertSelfClosingHTMLElement(WebCore::AtomicHTMLToken&&) 22 0x11f7a496f WebCore::HTMLTreeBuilder::processStartTagForInBody(WebCore::AtomicHTMLToken&&) 23 0x11f79c511 WebCore::HTMLTreeBuilder::processStartTag(WebCore::AtomicHTMLToken&&) 24 0x11f79b265 WebCore::HTMLTreeBuilder::processToken(WebCore::AtomicHTMLToken&&) 25 0x11f79a069 WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&&) 26 0x11f509cb8 WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) 27 0x11f509a03 WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) 28 0x11f5075e3 WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) 29 0x11f506fa0 WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode) 30 0x11f50b1dc WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) 31 0x11e65e74c WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&, char const*, unsigned long) ASAN:DEADLYSIGNAL ================================================================= ==41182==ERROR: AddressSanitizer: SEGV on unknown address 0x0000bbadbeef (pc 0x000118fc6ca9 bp 0x7fff509b3960 sp 0x7fff509b3950 T0) #0 0x118fc6ca8 in WTFCrash (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2f81ca8) #1 0x122e34755 in WebCore::RenderMathMLOperator::updateTokenContent() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5897755) #2 0x121f0babc in WebCore::MathMLStyle::updateStyleIfNeeded(WebCore::RenderObject*, bool, WebCore::MathMLElement::MathVariant) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x496eabc) #3 0x121f0b2a6 in WebCore::MathMLStyle::resolveMathMLStyle(WebCore::RenderObject*) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x496e2a6) #4 0x121f0ae99 in WebCore::MathMLStyle::resolveMathMLStyleTree(WebCore::RenderObject*) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x496de99) #5 0x121ef7d02 in WebCore::MathMLMathElement::didAttachRenderers() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x495ad02) #6 0x12324d0ae in WebCore::RenderTreeUpdater::popParent() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5cb00ae) #7 0x12324b24e in WebCore::RenderTreeUpdater::popParentsToDepth(unsigned int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5cae24e) #8 0x12324ac89 in WebCore::RenderTreeUpdater::updateRenderTree(WebCore::ContainerNode&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5cadc89) #9 0x12324a2be in WebCore::RenderTreeUpdater::commit(std::__1::unique_ptr<WebCore::Style::Update, std::__1::default_delete<WebCore::Style::Update> >) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5cad2be) #10 0x11e77e3a8 in WebCore::Document::recalcStyle(WebCore::Style::Change) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x11e13a8) #11 0x11e7688ca in WebCore::Document::updateStyleIfNeeded() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x11cb8ca) #12 0x11f55ed4e in WebCore::HTMLEmbedElement::parseAttribute(WebCore::QualifiedName const&, WTF::AtomicString const&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1fc1d4e) #13 0x11eb54fd0 in WebCore::Element::attributeChanged(WebCore::QualifiedName const&, WTF::AtomicString const&, WTF::AtomicString const&, WebCore::Element::AttributeModificationReason) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x15b7fd0) #14 0x123b44e4e in WebCore::StyledElement::attributeChanged(WebCore::QualifiedName const&, WTF::AtomicString const&, WTF::AtomicString const&, WebCore::Element::AttributeModificationReason) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x65a7e4e) #15 0x11eb56962 in WebCore::Element::parserSetAttributes(WTF::Vector<WebCore::Attribute, 0ul, WTF::CrashOnOverflow, 16ul> const&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x15b9962) #16 0x11f493dac in WebCore::setAttributes(WebCore::Element&, WTF::Vector<WebCore::Attribute, 0ul, WTF::CrashOnOverflow, 16ul>&, WebCore::ParserContentPolicy) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ef6dac) #17 0x11f490655 in WebCore::setAttributes(WebCore::Element&, WebCore::AtomicHTMLToken&, WebCore::ParserContentPolicy) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ef3655) #18 0x11f49393b in WebCore::HTMLConstructionSite::createHTMLElementOrFindCustomElementInterface(WebCore::AtomicHTMLToken&, WebCore::JSCustomElementInterface**) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ef693b) #19 0x11f492101 in WebCore::HTMLConstructionSite::createHTMLElement(WebCore::AtomicHTMLToken&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ef5101) #20 0x11f493f1b in WebCore::HTMLConstructionSite::insertSelfClosingHTMLElement(WebCore::AtomicHTMLToken&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ef6f1b) #21 0x11f7a496e in WebCore::HTMLTreeBuilder::processStartTagForInBody(WebCore::AtomicHTMLToken&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x220796e) #22 0x11f79c510 in WebCore::HTMLTreeBuilder::processStartTag(WebCore::AtomicHTMLToken&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x21ff510) #23 0x11f79b264 in WebCore::HTMLTreeBuilder::processToken(WebCore::AtomicHTMLToken&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x21fe264) #24 0x11f79a068 in WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x21fd068) #25 0x11f509cb7 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1f6ccb7) #26 0x11f509a02 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1f6ca02) #27 0x11f5075e2 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1f6a5e2) #28 0x11f506f9f in WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1f69f9f) #29 0x11f50b1db in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1f6e1db) #30 0x11e65e74b in WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&, char const*, unsigned long) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x10c174b) #31 0x11e988ab1 in WebCore::DocumentWriter::addData(char const*, unsigned long) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x13ebab1) #32 0x11e8cfff5 in WebCore::DocumentLoader::commitData(char const*, unsigned long) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1332ff5) #33 0x11038ae9d in WebKit::WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x112be9d) #34 0x11e8d5186 in WebCore::DocumentLoader::commitLoad(char const*, int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1338186) #35 0x11e8d4eca in WebCore::DocumentLoader::dataReceived(char const*, int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1337eca) #36 0x11e8d5568 in WebCore::DocumentLoader::dataReceived(WebCore::CachedResource&, char const*, int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1338568) #37 0x11db84f71 in WebCore::CachedRawResource::notifyClientsDataWasReceived(char const*, unsigned int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5e7f71) #38 0x11db84c20 in WebCore::CachedRawResource::addDataBuffer(WebCore::SharedBuffer&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5e7c20) #39 0x123c9114a in WebCore::SubresourceLoader::didReceiveDataOrBuffer(char const*, int, WTF::RefPtr<WebCore::SharedBuffer>&&, long long, WebCore::DataPayloadType) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x66f414a) #40 0x123c90a80 in WebCore::SubresourceLoader::didReceiveData(char const*, unsigned int, long long, WebCore::DataPayloadType) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x66f3a80) #41 0x110d7ab3a in WebKit::WebResourceLoader::didReceiveData(IPC::DataReference const&, long long) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1b1bb3a) #42 0x110d88ae3 in void IPC::callMemberFunctionImpl<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>, 0ul, 1ul>(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>&&, std::__1::integer_sequence<unsigned long, 0ul, 1ul>) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1b29ae3) #43 0x110d885e4 in void IPC::callMemberFunction<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>, std::__1::integer_sequence<unsigned long, 0ul, 1ul> >(std::__1::tuple<IPC::DataReference, long long>&&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1b295e4) #44 0x110d85cf1 in void IPC::handleMessage<Messages::WebResourceLoader::DidReceiveData, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1b26cf1) #45 0x110d84280 in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1b25280) #46 0x10fa24629 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x7c5629) #47 0x10f43830a in IPC::Connection::dispatchMessage(IPC::Decoder&) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1d930a) #48 0x10f422184 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1c3184) #49 0x10f438ff5 in IPC::Connection::dispatchOneMessage() (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1d9ff5) #50 0x10f4495ac in IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14::operator()() (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1ea5ac) #51 0x10f4494d8 in WTF::Function<void ()>::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14>::call() (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1ea4d8) #52 0x11904cb60 in WTF::Function<void ()>::operator()() const (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x3007b60) #53 0x11908f5b6 in WTF::RunLoop::performWork() (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x304a5b6) #54 0x119090781 in WTF::RunLoop::performWork(void*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x304b781) #55 0x7fff94efd7e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0) #56 0x7fff94edcf1b in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89f1b) #57 0x7fff94edc43e in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x8943e) #58 0x7fff94edbe37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37) #59 0x7fff93297934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934) #60 0x7fff9329776e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e) #61 0x7fff932975ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae) #62 0x7fff98137df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5) #63 0x7fff98137225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225) #64 0x7fff9812bd7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f) #65 0x7fff980f5367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367) #66 0x7fff8beec193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193) #67 0x7fff8beeabbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd) #68 0x10f242f73 in main (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001f73) #69 0x7fff9ecd85ac in start (/usr/lib/system/libdyld.dylib+0x35ac) #70 0x0 (<unknown module>) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2f81ca8) in WTFCrash ==41182==ABORTING #CRASHED - com.apple.WebKit.WebContent.Development (pid 41182)