Load the attached test with sut.webkittestrunner: Checked version: f368f1d OS: Darwin-15.6.0-x86_64-i386-64bit <style>{}*,*{transform:skew(152deg)skewY(58rad)translate(0);position:fixed</style><video controls> Backtrace: ASSERTION FAILED: willBeComposited == needsToBeComposited(layer) WebKit/Source/WebCore/rendering/RenderLayerCompositor.cpp(1431) : void WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer *, WebCore::RenderLayer &, WebCore::RenderLayerCompositor::OverlapMap &, WebCore::RenderLayerCompositor::CompositingState &, bool &, bool &) 1 0x118aec4f1 WTFCrash 2 0x121fd97c1 WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&, bool&) 3 0x121fd9636 WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&, bool&) 4 0x121fd361f WebCore::RenderLayerCompositor::updateCompositingLayers(WebCore::CompositingUpdateType, WebCore::RenderLayer*) 5 0x11e8861e4 WebCore::FrameView::updateCompositingLayersAfterLayout() 6 0x11e88be17 WebCore::FrameView::layout(bool) 7 0x11df0b6fa WebCore::Document::updateLayout() 8 0x11df13fc1 WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks) 9 0x11e2b3416 WebCore::Element::getBoundingClientRect() 10 0x11fdcd095 WebCore::jsElementPrototypeFunctionGetBoundingClientRect(JSC::ExecState*) 11 0x342a60601028 12 0x118171994 llint_entry 13 0x118171994 llint_entry 14 0x118171994 llint_entry 15 0x118171994 llint_entry 16 0x118171994 llint_entry 17 0x118171994 llint_entry 18 0x118171994 llint_entry 19 0x118171d05 llint_entry 20 0x11816a4ae vmEntryToJavaScript 21 0x117b982be JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) 22 0x117a636f1 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 23 0x11654471b JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 24 0x11ed613da WebCore::HTMLMediaElement::didAddUserAgentShadowRoot(WebCore::ShadowRoot*) 25 0x11e2b89a8 WebCore::Element::addShadowRoot(WTF::Ref<WebCore::ShadowRoot>&&) 26 0x11e2b8c7b WebCore::Element::ensureUserAgentShadowRoot() 27 0x11ed4f86a WebCore::HTMLMediaElement::ensureMediaControlsShadowRoot() 28 0x11ed291ed WebCore::HTMLMediaElement::configureMediaControls() 29 0x11ed2a886 WebCore::HTMLMediaElement::insertedInto(WebCore::ContainerNode&) 30 0x11d648184 WebCore::notifyNodeInsertedIntoDocument(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) 31 0x11d648a44 WebCore::notifyChildNodeInserted(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) ASAN:DEADLYSIGNAL ================================================================= ==25428==ERROR: AddressSanitizer: SEGV on unknown address 0x0000bbadbeef (pc 0x000118aec529 bp 0x7fff509bdd50 sp 0x7fff509bdd40 T0) #0 0x118aec528 in WTFCrash (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2d01528) #1 0x121fd97c0 in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&, bool&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x52527c0) #2 0x121fd9635 in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&, bool&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x5252635) #3 0x121fd361e in WebCore::RenderLayerCompositor::updateCompositingLayers(WebCore::CompositingUpdateType, WebCore::RenderLayer*) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x524c61e) #4 0x11e8861e3 in WebCore::FrameView::updateCompositingLayersAfterLayout() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1aff1e3) #5 0x11e88be16 in WebCore::FrameView::layout(bool) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1b04e16) #6 0x11df0b6f9 in WebCore::Document::updateLayout() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x11846f9) #7 0x11df13fc0 in WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x118cfc0) #8 0x11e2b3415 in WebCore::Element::getBoundingClientRect() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x152c415) #9 0x11fdcd094 in WebCore::jsElementPrototypeFunctionGetBoundingClientRect(JSC::ExecState*) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x3046094) #10 0x342a60601027 (<unknown module>) #11 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #12 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #13 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #14 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #15 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #16 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #17 0x118171993 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386993) #18 0x118171d04 in llint_entry (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2386d04) #19 0x11816a4ad in vmEntryToJavaScript (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x237f4ad) #20 0x117b982bd in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1dad2bd) #21 0x117a636f0 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1c786f0) #22 0x11654471a in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x75971a) #23 0x11ed613d9 in WebCore::HTMLMediaElement::didAddUserAgentShadowRoot(WebCore::ShadowRoot*) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1fda3d9) #24 0x11e2b89a7 in WebCore::Element::addShadowRoot(WTF::Ref<WebCore::ShadowRoot>&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x15319a7) #25 0x11e2b8c7a in WebCore::Element::ensureUserAgentShadowRoot() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1531c7a) #26 0x11ed4f869 in WebCore::HTMLMediaElement::ensureMediaControlsShadowRoot() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1fc8869) #27 0x11ed291ec in WebCore::HTMLMediaElement::configureMediaControls() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1fa21ec) #28 0x11ed2a885 in WebCore::HTMLMediaElement::insertedInto(WebCore::ContainerNode&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1fa3885) #29 0x11d648183 in WebCore::notifyNodeInsertedIntoDocument(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x8c1183) #30 0x11d648a43 in WebCore::notifyChildNodeInserted(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x8c1a43) #31 0x11d6251a9 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x89e1a9) #32 0x11d62370d in WebCore::ContainerNode::parserAppendChild(WebCore::Node&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x89c70d) #33 0x11ebc42c2 in WebCore::insert(WebCore::HTMLConstructionSiteTask&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1e3d2c2) #34 0x11ebc3d6e in WebCore::executeInsertTask(WebCore::HTMLConstructionSiteTask&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1e3cd6e) #35 0x11ebbcbc1 in WebCore::executeTask(WebCore::HTMLConstructionSiteTask&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1e35bc1) #36 0x11ebbca98 in WebCore::HTMLConstructionSite::executeQueuedTasks() (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1e35a98) #37 0x11eea46a2 in WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x211d6a2) #38 0x11ec30576 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ea9576) #39 0x11ec302d2 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ea92d2) #40 0x11ec2deb2 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ea6eb2) #41 0x11ec2d86f in WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1ea686f) #42 0x11ec31afb in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1eaaafb) #43 0x11dddf1eb in WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&, char const*, unsigned long) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x10581eb) #44 0x11e0fdcf1 in WebCore::DocumentWriter::addData(char const*, unsigned long) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x1376cf1) #45 0x11e058045 in WebCore::DocumentLoader::commitData(char const*, unsigned long) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x12d1045) #46 0x110342e4d in WebKit::WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x10ede4d) #47 0x11e05d1b6 in WebCore::DocumentLoader::commitLoad(char const*, int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x12d61b6) #48 0x11e05cefa in WebCore::DocumentLoader::dataReceived(char const*, int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x12d5efa) #49 0x11e05d598 in WebCore::DocumentLoader::dataReceived(WebCore::CachedResource&, char const*, int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x12d6598) #50 0x11d38d931 in WebCore::CachedRawResource::notifyClientsDataWasReceived(char const*, unsigned int) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x606931) #51 0x11d38d5e0 in WebCore::CachedRawResource::addDataBuffer(WebCore::SharedBuffer&) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x6065e0) #52 0x122e8991a in WebCore::SubresourceLoader::didReceiveDataOrBuffer(char const*, int, WTF::RefPtr<WebCore::SharedBuffer>&&, long long, WebCore::DataPayloadType) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x610291a) #53 0x122e89250 in WebCore::SubresourceLoader::didReceiveData(char const*, unsigned int, long long, WebCore::DataPayloadType) (WebKit/WebKitBuild/Debug/WebCore.framework/Versions/A/WebCore+0x6102250) #54 0x110ce61fa in WebKit::WebResourceLoader::didReceiveData(IPC::DataReference const&, long long) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1a911fa) #55 0x110cf4003 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+0x1a9f003) #56 0x110cf3b04 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+0x1a9eb04) #57 0x110cf1211 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+0x1a9c211) #58 0x110cef7c0 in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1a9a7c0) #59 0x10fa18da9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x7c3da9) #60 0x10f42cfba in IPC::Connection::dispatchMessage(IPC::Decoder&) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1d7fba) #61 0x10f4157c4 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1c07c4) #62 0x10f42dca5 in IPC::Connection::dispatchOneMessage() (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1d8ca5) #63 0x10f43e25c in IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14::operator()() (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1e925c) #64 0x10f43e188 in WTF::Function<void ()>::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14>::call() (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/WebKit+0x1e9188) #65 0x118b70830 in WTF::Function<void ()>::operator()() const (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2d85830) #66 0x118bbac46 in WTF::RunLoop::performWork() (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2dcfc46) #67 0x118bbbb11 in WTF::RunLoop::performWork(void*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2dd0b11) #68 0x7fff81c1f880 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa880) #69 0x7fff81bfefbb in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89fbb) #70 0x7fff81bfe4de in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x894de) #71 0x7fff81bfded7 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88ed7) #72 0x7fff82fde934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934) #73 0x7fff82fde76e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e) #74 0x7fff82fde5ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae) #75 0x7fff8e643df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5) #76 0x7fff8e643225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225) #77 0x7fff8e637d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f) #78 0x7fff8e601367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367) #79 0x7fff92f09193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193) #80 0x7fff92f07bbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd) #81 0x10f239f73 in main (WebKit/WebKitBuild/Debug/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001f73) #82 0x7fff8ab8d5ac in start (/usr/lib/system/libdyld.dylib+0x35ac) #83 0x0 (<unknown module>) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2d01528) in WTFCrash ==25428==ABORTING #CRASHED - com.apple.WebKit.WebContent.Development (pid 25428)
Created attachment 297434 [details] Test
This is caused by media script running in the middle of tree building.
(In reply to comment #2) > This is caused by media script running in the middle of tree building. Moar assertions!
I wonder if this applies to modern media controls where most of the DOM changes are performed asynchronously.
This is assertion error is still an issue. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Dash.js player</title> <style> html, body { margin: 0; padding: 0; overflow: hidden; background: #6f8742; } body { position: absolute; top: 0; bottom: 0; left: 0; right: 0; } #video { width: 100%; height: 100%; } </style> </head> <body> <script src="https://cdnjs.cloudflare.com/ajax/libs/dashjs/2.9.2/dash.all.debug.js"></script> <video data-dashjs-player autoplay controls id="video" src="http://www-itec.uni-klu.ac.at/ftp/datasets/DASHDataset2014/BigBuckBunny/15sec/BigBuckBunny_15s_onDemand_2014_05_09.mpd"></video> </body> </html> Note: The URL does not load (CORS problem I guess). It doesn't matter. It will crash when you move the mouse over the window nevertheless.
ASSERTION FAILED: willBeComposited == needsToBeComposited(layer, queryData) [Current thread is 1 (Thread 0x7fdbaff1aac0 (LWP 25450))] Missing separate debuginfos, use: dnf debuginfo-install elfutils-libelf-0.174-5.fc29.x86_64 glibc-2.28-23.fc29.x86_64 nettle-3.4.1rc1-1.fc29.x86_64 (gdb) bt #0 WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:255 #1 0x00007fdbc99c771c in WebCore::RenderLayerCompositor::computeCompositingRequirements (this=0x7fdbaf569d40, ancestorLayer=0x7fdbaf5a3b40, layer=..., overlapMap=..., compositingState=..., descendantHas3DTransform=@0x7fffa305cbef: false) at ../../Source/WebCore/rendering/RenderLayerCompositor.cpp:983 #2 0x00007fdbc99c72ca in WebCore::RenderLayerCompositor::computeCompositingRequirements (this=0x7fdbaf569d40, ancestorLayer=0x7fdbaf5a38c0, layer=..., overlapMap=..., compositingState=..., descendantHas3DTransform=@0x7fffa305cd3f: false) at ../../Source/WebCore/rendering/RenderLayerCompositor.cpp:901 #3 0x00007fdbc99c72ca in WebCore::RenderLayerCompositor::computeCompositingRequirements (this=0x7fdbaf569d40, ancestorLayer=0x0, layer=..., overlapMap=..., compositingState=..., descendantHas3DTransform=@0x7fffa305d30f: false) at ../../Source/WebCore/rendering/RenderLayerCompositor.cpp:901 #4 0x00007fdbc99c67ac in WebCore::RenderLayerCompositor::updateCompositingLayers (this=0x7fdbaf569d40, updateType=WebCore::CompositingUpdateType::AfterLayout, updateRoot=0x7fdbaf5a38c0) at ../../Source/WebCore/rendering/RenderLayerCompositor.cpp:729 #5 0x00007fdbc9403b43 in WebCore::FrameView::updateCompositingLayersAfterLayout (this=0x7fdb508004e0) at ../../Source/WebCore/page/FrameView.cpp:850 #6 0x00007fdbc9404ff0 in WebCore::FrameView::didLayout (this=0x7fdb508004e0, layoutRoot=...) at ../../Source/WebCore/page/FrameView.cpp:1300 #7 0x00007fdbc943d91c in WebCore::FrameViewLayoutContext::layout (this=0x7fdb508008f8) at ../../Source/WebCore/page/FrameViewLayoutContext.cpp:239 #8 0x00007fdbc8c63ee4 in WebCore::Document::updateLayout (this=0x7fdb50600ff0) at ../../Source/WebCore/dom/Document.cpp:2093 #9 0x00007fdbc8c63f6e in WebCore::Document::updateLayoutIgnorePendingStylesheets (this=0x7fdb50600ff0, runPostLayoutTasks=WebCore::Document::RunPostLayoutTasks::Asynchronously) at ../../Source/WebCore/dom/Document.cpp:2107 #10 0x00007fdbc8ce9b14 in WebCore::Element::offsetLeft (this=0x7fdb32c000f0) at ../../Source/WebCore/dom/Element.cpp:888 #11 0x00007fdbc7d0ba77 in WebCore::jsHTMLElementOffsetLeftGetter (state=..., thisObject=..., throwScope=...) at DerivedSources/WebCore/JSHTMLElement.cpp:966 #12 0x00007fdbc7d17d52 in WebCore::IDLAttribute<WebCore::JSHTMLElement>::get<WebCore::jsHTMLElementOffsetLeftGetter, (WebCore::CastedThisErrorBehavior)3> (state=..., thisValue=140579613835264, attributeName=0x7fdbcb82e0a0 "offsetLeft") at ../../Source/WebCore/bindings/js/JSDOMAttribute.h:69 #13 0x00007fdbc7d0bacf in WebCore::jsHTMLElementOffsetLeft (state=0x7fffa305dc00, thisValue=140579613835264) at DerivedSources/WebCore/JSHTMLElement.cpp:972 #14 0x00007fdbbc8840b1 in JSC::PropertySlot::customGetter (this=0x7fffa305da30, exec=0x7fffa305dc00, propertyName=...) at ../../Source/JavaScriptCore/runtime/PropertySlot.cpp:50 #15 0x00007fdbc78da97f in JSC::PropertySlot::getValue (this=0x7fffa305da30, exec=0x7fffa305dc00, propertyName=...) at DerivedSources/ForwardingHeaders/JavaScriptCore/PropertySlot.h:410 #16 0x00007fdbbbf97a31 in JSC::JSValue::get (this=0x7fffa305da88, exec=0x7fffa305dc00, propertyName=..., slot=...) at ../../Source/JavaScriptCore/runtime/JSCJSValueInlines.h:841 #17 0x00007fdbbc56610a in JSC::LLInt::llint_slow_path_get_by_id (exec=0x7fffa305dc00, pc=0x7fdb3e6e328f) at ../../Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:764 #18 0x00007fdbbc5555f5 in llint_entry () from /webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18 #19 0x00007fdbbc560073 in llint_entry () from /webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18 #20 0x00007fdbbc560073 in llint_entry () from /webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18 #21 0x00007fdbbc5600fd in llint_entry () from /webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18 #22 0x00007fdbbc54e988 in vmEntryToJavaScript () from /webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18 #23 0x00007fdbbc48e8ad in JSC::JITCode::execute (this=0x7fdb3e6d7168, vm=0x7fdb60000000, protoCallFrame=0x7fffa305dfa0) at ../../Source/JavaScriptCore/jit/JITCodeInlines.h:38 #24 0x00007fdbbc486392 in JSC::Interpreter::executeCall (this=0x7fdbaf5ff790, callFrame=0x7fdb534e0ff8, function=0x7fdb3df50600, callType=JSC::CallType::JS, callData=..., thisValue=..., args=...) at ../../Source/JavaScriptCore/interpreter/Interpreter.cpp:891 #25 0x00007fdbbc6cb238 in JSC::call (exec=0x7fdb534e0ff8, functionObject=..., callType=JSC::CallType::JS, callData=..., thisValue=..., args=...) at ../../Source/JavaScriptCore/runtime/CallData.cpp:41 #26 0x00007fdbbc6cb309 in JSC::call (exec=0x7fdb534e0ff8, functionObject=..., callType=JSC::CallType::JS, callData=..., thisValue=..., args=..., returnedException=...) at ../../Source/JavaScriptCore/runtime/CallData.cpp:48 #27 0x00007fdbbc6cb4c5 in JSC::profiledCall (exec=0x7fdb534e0ff8, reason=JSC::ProfilingReason::Other, functionObject=..., callType=JSC::CallType::JS, callData=..., thisValue=..., args=..., returnedException=...) at ../../Source/JavaScriptCore/runtime/CallData.cpp:69 #28 0x00007fdbc88b5870 in WebCore::JSExecState::profiledCall (exec=0x7fdb534e0ff8, reason=JSC::ProfilingReason::Other, functionObject=..., callType=JSC::CallType::JS, callData=..., thisValue=..., args=..., returnedException=...) at ../../Source/WebCore/bindings/js/JSExecState.h:74 #29 0x00007fdbc88ea731 in WebCore::JSEventListener::handleEvent (this=0x7fdb3e03cf88, scriptExecutionContext=..., event=...) at ../../Source/WebCore/bindings/js/JSEventListener.cpp:175 #30 0x00007fdbc8d15e0b in WebCore::EventTarget::innerInvokeEventListeners (this=0x7fdb3c4008d0, event=..., listeners=..., phase=WebCore::EventTarget::EventInvokePhase::Bubbling) at ../../Source/WebCore/dom/EventTarget.cpp:301 #31 0x00007fdbc8d15928 in WebCore::EventTarget::fireEventListeners (this=0x7fdb3c4008d0, event=..., phase=WebCore::EventTarget::EventInvokePhase::Bubbling) at ../../Source/WebCore/dom/EventTarget.cpp:242 #32 0x00007fdbc8d60b2b in WebCore::Node::handleLocalEvents (this=0x7fdb3c4008d0, event=..., phase=WebCore::EventTarget::EventInvokePhase::Bubbling) at ../../Source/WebCore/dom/Node.cpp:2374 #33 0x00007fdbc8cf8ec3 in WebCore::EventContext::handleLocalEvents (this=0x7fd9401fffa0, event=..., phase=WebCore::EventTarget::EventInvokePhase::Bubbling) at ../../Source/WebCore/dom/EventContext.cpp:55 #34 0x00007fdbc8d0f6f6 in WebCore::dispatchEventInDOM (event=..., path=...) at ../../Source/WebCore/dom/EventDispatcher.cpp:100 #35 0x00007fdbc8d0fb19 in WebCore::EventDispatcher::dispatchEvent (node=..., event=...) at ../../Source/WebCore/dom/EventDispatcher.cpp:154 #36 0x00007fdbc8d60b7d in WebCore::Node::dispatchEvent (this=0x7fdb3c4008d0, event=...) at ../../Source/WebCore/dom/Node.cpp:2384 #37 0x00007fdbc8d20059 in WebCore::GenericEventQueue::dispatchOneEvent (this=0x7fdb3c400e40) at ../../Source/WebCore/dom/GenericEventQueue.cpp:73 #38 0x00007fdbc8d2cbb6 in std::__invoke_impl<void, void (WebCore::GenericEventQueue::*&)(), WebCore::GenericEventQueue*&> ( __f=@0x7fd94017d488: (void (WebCore::GenericEventQueue::*)(WebCore::GenericEventQueue * const)) 0x7fdbc8d1fe4c <WebCore::GenericEventQueue::dispatchOneEvent()>, __t=@0x7fd94017d498: 0x7fdb3c400e40) at /usr/include/c++/8/bits/invoke.h:73 #39 0x00007fdbc8d2cb2d in std::__invoke<void (WebCore::GenericEventQueue::*&)(), WebCore::GenericEventQueue*&> ( __fn=@0x7fd94017d488: (void (WebCore::GenericEventQueue::*)(WebCore::GenericEventQueue * const)) 0x7fdbc8d1fe4c <WebCore::GenericEventQueue::dispatchOneEvent()>, __args#0=@0x7fd94017d498: 0x7fdb3c400e40) --Type <RET> for more, q to quit, c to continue without paging-- at /usr/include/c++/8/bits/invoke.h:95 #40 0x00007fdbc8d2ca9a in std::_Bind<void (WebCore::GenericEventQueue::*(WebCore::GenericEventQueue*))()>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>) (this=0x7fd94017d488, __args=...) at /usr/include/c++/8/functional:400 #41 0x00007fdbc8d2ca50 in std::_Bind<void (WebCore::GenericEventQueue::*(WebCore::GenericEventQueue*))()>::operator()<, void>() (this=0x7fd94017d488) at /usr/include/c++/8/functional:484 #42 0x00007fdbc8d2ca2a in WTF::Function<void ()>::CallableWrapper<std::_Bind<void (WebCore::GenericEventQueue::*(WebCore::GenericEventQueue*))()> >::call() (this=0x7fd94017d480) at DerivedSources/ForwardingHeaders/wtf/Function.h:101 #43 0x00007fdbc703af42 in WTF::Function<void ()>::operator()() const (this=0x7fd94015ac40) at DerivedSources/ForwardingHeaders/wtf/Function.h:56 #44 0x00007fdbc86843d4 in WebCore::GenericTaskQueue<WebCore::Timer, unsigned int>::enqueueTask(WTF::Function<void ()>&&)::{lambda()#1}::operator()() const (this=0x7fd94015ac38) at ../../Source/WebCore/platform/GenericTaskQueue.h:106 #45 0x00007fdbc8686f4a in WTF::Function<void ()>::CallableWrapper<WebCore::GenericTaskQueue<WebCore::Timer, unsigned int>::enqueueTask(WTF::Function<void ()>&&)::{lambda()#1}>::call() (this=0x7fd94015ac30) at DerivedSources/ForwardingHeaders/wtf/Function.h:101 #46 0x00007fdbc703af42 in WTF::Function<void ()>::operator()() const (this=0x7fffa305eb60) at DerivedSources/ForwardingHeaders/wtf/Function.h:56 #47 0x00007fdbc954f93f in WebCore::TaskDispatcher<WebCore::Timer>::dispatchOneTask (this=0x7fdb3c400e50) at ../../Source/WebCore/platform/GenericTaskQueue.cpp:110 #48 0x00007fdbc954f7ee in WebCore::TaskDispatcher<WebCore::Timer>::sharedTimerFired () at ../../Source/WebCore/platform/GenericTaskQueue.cpp:85 #49 0x00007fdbc954f631 in WebCore::TaskDispatcher<WebCore::Timer>::<lambda()>::operator()(void) const (__closure=0x7fdb3e070748) at ../../Source/WebCore/platform/GenericTaskQueue.cpp:60 #50 0x00007fdbc9550928 in WTF::Function<void()>::CallableWrapper<WebCore::TaskDispatcher<WebCore::Timer>::sharedTimer()::<lambda()> >::call(void) (this=0x7fdb3e070740) at DerivedSources/ForwardingHeaders/wtf/Function.h:101 #51 0x00007fdbc703af42 in WTF::Function<void ()>::operator()() const (this=0x7fdbcfd17438 <WebCore::TaskDispatcher<WebCore::Timer>::sharedTimer()::timer+56>) at DerivedSources/ForwardingHeaders/wtf/Function.h:56 #52 0x00007fdbc7037f1e in WebCore::Timer::fired (this=0x7fdbcfd17400 <WebCore::TaskDispatcher<WebCore::Timer>::sharedTimer()::timer>) at ../../Source/WebCore/platform/Timer.h:131 #53 0x00007fdbc957c3fe in WebCore::ThreadTimers::sharedTimerFiredInternal (this=0x7fdbaf588e60) at ../../Source/WebCore/platform/ThreadTimers.cpp:117 #54 0x00007fdbc957bf5b in WebCore::ThreadTimers::<lambda()>::operator()(void) const (__closure=0x7fdbaf5fa3d8) at ../../Source/WebCore/platform/ThreadTimers.cpp:69 #55 0x00007fdbc957fb18 in WTF::Function<void()>::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::<lambda()> >::call(void) (this=0x7fdbaf5fa3d0) at DerivedSources/ForwardingHeaders/wtf/Function.h:101 #56 0x00007fdbc703af42 in WTF::Function<void ()>::operator()() const (this=0x7fdbcfd17748 <WebCore::MainThreadSharedTimer::singleton()::instance+8>) at DerivedSources/ForwardingHeaders/wtf/Function.h:56 #57 0x00007fdbc955e101 in WebCore::MainThreadSharedTimer::fired (this=0x7fdbcfd17740 <WebCore::MainThreadSharedTimer::singleton()::instance>) at ../../Source/WebCore/platform/MainThreadSharedTimer.cpp:83 #58 0x00007fdbc9561efa in WTF::RunLoop::Timer<WebCore::MainThreadSharedTimer>::fired (this=0x7fdbcfd17750 <WebCore::MainThreadSharedTimer::singleton()::instance+16>) at DerivedSources/ForwardingHeaders/wtf/RunLoop.h:148 #59 0x00007fdbbcb6214b in WTF::RunLoop::TimerBase::<lambda(gpointer)>::operator()(gpointer) const (__closure=0x0, userData=0x7fdbcfd17750 <WebCore::MainThreadSharedTimer::singleton()::instance+16>) at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:170 #60 0x00007fdbbcb621a3 in WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer) () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:176 #61 0x00007fdbbcb618c8 in WTF::<lambda(GSource*, GSourceFunc, gpointer)>::operator()(GSource *, GSourceFunc, gpointer) const (__closure=0x0, source=0x2827a60, callback=0x7fdbbcb62186 <WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer)>, userData=0x7fdbcfd17750 <WebCore::MainThreadSharedTimer::singleton()::instance+16>) at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:45 #62 0x00007fdbbcb618f8 in WTF::<lambda(GSource*, GSourceFunc, gpointer)>::_FUN(GSource *, GSourceFunc, gpointer) () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:46 #63 0x00007fdbb3fdb818 in g_main_dispatch () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.54.2/glib/gmain.c:3148 #64 g_main_context_dispatch () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.54.2/glib/gmain.c:3813 #65 0x00007fdbb3fdbbd8 in g_main_context_iterate () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.54.2/glib/gmain.c:3886 #66 0x00007fdbb3fdbec2 in g_main_loop_run () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.54.2/glib/gmain.c:4082 #67 0x00007fdbbcb61e06 in WTF::RunLoop::run () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:96 #68 0x00007fdbc7a3ca71 in WebKit::ChildProcessMain<WebKit::WebProcess, WebKit::WebProcessMain> (argc=3, argv=0x7fffa305f118) at ../../Source/WebKit/Shared/unix/ChildProcessMain.h:61 #69 0x00007fdbc7a3a34f in WebKit::WebProcessMainUnix (argc=3, argv=0x7fffa305f118) at ../../Source/WebKit/WebProcess/gtk/WebProcessMainGtk.cpp:67 #70 0x0000000000400cc1 in main (argc=3, argv=0x7fffa305f118) at ../../Source/WebKit/WebProcess/EntryPoint/unix/WebProcessMain.cpp:52
Just hit this bug today with a debug build at r239512 on <https://vrbo.com> while looking into <rdar://problem/46863949>. It was triggered from accessibility code. Here are the steps I performed: 1. Visit <https://vrbo.com>. 2. Focus the Destination field and pick someplace. 3. After selecting a destination, the Arrive field is automatically focused. Pick a date. 4. Same as 3 but with the Depart field. 5. Scroll the page up. Then the WebContent process crashed due to the ASSERT(willBeComposited == needsToBeComposited(layer, queryData)); failing in RenderLayerCompositor::computeCompositingRequirements(). Here is the backtrace: #0 0x00000007bec304e0 in ::WTFCrash() at /Volumes/.../OpenSource/Source/WTF/wtf/Assertions.cpp:255 #1 0x00000007a800daeb in WTFCrashWithInfo(int, char const*, char const*, int) at /Volumes/.../OpenSource/WebKitBuild/Debug/usr/local/include/wtf/Assertions.h:559 #2 0x00000007ab68f043 in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&) at /Volumes/.../OpenSource/Source/WebCore/rendering/RenderLayerCompositor.cpp:983 #3 0x00000007ab68ebab in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&) at /Volumes/.../OpenSource/Source/WebCore/rendering/RenderLayerCompositor.cpp:901 #4 0x00000007ab68ebab in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&) at /Volumes/.../OpenSource/Source/WebCore/rendering/RenderLayerCompositor.cpp:901 #5 0x00000007ab68ebab in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&) at /Volumes/.../OpenSource/Source/WebCore/rendering/RenderLayerCompositor.cpp:901 #6 0x00000007ab68ebab in WebCore::RenderLayerCompositor::computeCompositingRequirements(WebCore::RenderLayer*, WebCore::RenderLayer&, WebCore::RenderLayerCompositor::OverlapMap&, WebCore::RenderLayerCompositor::CompositingState&, bool&) at /Volumes/.../OpenSource/Source/WebCore/rendering/RenderLayerCompositor.cpp:901 #7 0x00000007ab66037f in WebCore::RenderLayerCompositor::updateCompositingLayers(WebCore::CompositingUpdateType, WebCore::RenderLayer*) at /Volumes/.../OpenSource/Source/WebCore/rendering/RenderLayerCompositor.cpp:729 #8 0x00000007aae2c0b3 in WebCore::FrameView::updateCompositingLayersAfterLayout() at /Volumes/.../OpenSource/Source/WebCore/page/FrameView.cpp:850 #9 0x00000007aae2e967 in WebCore::FrameView::didLayout(WTF::WeakPtr<WebCore::RenderElement>) at /Volumes/.../OpenSource/Source/WebCore/page/FrameView.cpp:1300 #10 0x00000007aae6c9fb in WebCore::FrameViewLayoutContext::layout() at /Volumes/.../OpenSource/Source/WebCore/page/FrameViewLayoutContext.cpp:239 #11 0x00000007aa2f7966 in WebCore::Document::updateLayout() at /Volumes/.../OpenSource/Source/WebCore/dom/Document.cpp:2091 #12 0x00000007aa2f8ede in WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks) at /Volumes/.../OpenSource/Source/WebCore/dom/Document.cpp:2105 #13 0x00000007a9ce467e in WebCore::AccessibilityObject::updateBackingStore() at /Volumes/.../OpenSource/Source/WebCore/accessibility/AccessibilityObject.cpp:1787 #14 0x00000007abea5b23 in ::-[WebAccessibilityObjectWrapperBase updateObjectBackingStore]() at /Volumes/.../OpenSource/Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.mm:292 #15 0x00000007abebeb5c in ::-[WebAccessibilityObjectWrapper accessibilityIsIgnored]() at /Volumes/.../OpenSource/Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperMac.mm:3371 #16 0x00000007a842ee2b in WebCore::AXObjectCache::postPlatformNotification(WebCore::AccessibilityObject*, WebCore::AXObjectCache::AXNotification) at /Volumes/.../OpenSource/Source/WebCore/accessibility/mac/AXObjectCacheMac.mm:350 #17 0x00000007a9c863e1 in WebCore::AXObjectCache::notificationPostTimerFired() at /Volumes/.../OpenSource/Source/WebCore/accessibility/AXObjectCache.cpp:922 #18 0x00000007a9caf101 in decltype(*(std::__1::forward<WebCore::AXObjectCache*&>(fp0)).*fp()) std::__1::__invoke<void (WebCore::AXObjectCache::*&)(), WebCore::AXObjectCache*&, void>(void (WebCore::AXObjectCache::*&)(), WebCore::AXObjectCache*&) at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/OSX10.15.xctoolchain/usr/include/c++/v1/type_traits:4286 #19 0x00000007a9caf060 in std::__1::__bind_return<void (WebCore::AXObjectCache::*)(), std::__1::tuple<WebCore::AXObjectCache*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::AXObjectCache::*)(), std::__1::tuple<WebCore::AXObjectCache*>, std::__1::tuple<> >::value>::type std::__1::__apply_functor<void (WebCore::AXObjectCache::*)(), std::__1::tuple<WebCore::AXObjectCache*>, 0ul, std::__1::tuple<> >(void (WebCore::AXObjectCache::*&)(), std::__1::tuple<WebCore::AXObjectCache*>&, std::__1::__tuple_indices<0ul>, std::__1::tuple<>&&) at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/OSX10.15.xctoolchain/usr/include/c++/v1/functional:2216 #20 0x00000007a9caf00c in std::__1::__bind_return<void (WebCore::AXObjectCache::*)(), std::__1::tuple<WebCore::AXObjectCache*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::AXObjectCache::*)(), std::__1::tuple<WebCore::AXObjectCache*>, std::__1::tuple<> >::value>::type std::__1::__bind<void (WebCore::AXObjectCache::*&)(), WebCore::AXObjectCache*>::operator()<>() at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/OSX10.15.xctoolchain/usr/include/c++/v1/functional:2249 #21 0x00000007a9caefa9 in WTF::Function<void ()>::CallableWrapper<std::__1::__bind<void (WebCore::AXObjectCache::*&)(), WebCore::AXObjectCache*> >::call() at /Volumes/.../OpenSource/WebKitBuild/Debug/usr/local/include/wtf/Function.h:101 #22 0x00000007a800f4da in WTF::Function<void ()>::operator()() const at /Volumes/.../OpenSource/WebKitBuild/Debug/usr/local/include/wtf/Function.h:56 #23 0x00000007a80aad09 in WebCore::Timer::fired() at /Volumes/.../OpenSource/Source/WebCore/platform/Timer.h:131 #24 0x00000007ab0433d9 in WebCore::ThreadTimers::sharedTimerFiredInternal() at /Volumes/.../OpenSource/Source/WebCore/platform/ThreadTimers.cpp:117 #25 0x00000007ab04dc31 in WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const at /Volumes/.../OpenSource/Source/WebCore/platform/ThreadTimers.cpp:69 #26 0x00000007ab04dbe9 in WTF::Function<void ()>::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0>::call() at /Volumes/.../OpenSource/WebKitBuild/Debug/usr/local/include/wtf/Function.h:101 #27 0x00000007a800f4da in WTF::Function<void ()>::operator()() const at /Volumes/.../OpenSource/WebKitBuild/Debug/usr/local/include/wtf/Function.h:56 #28 0x00000007ab019e07 in WebCore::MainThreadSharedTimer::fired() at /Volumes/.../OpenSource/Source/WebCore/platform/MainThreadSharedTimer.cpp:83 #29 0x00000007ab0a1916 in WebCore::timerFired(__CFRunLoopTimer*, void*) at /Volumes/.../OpenSource/Source/WebCore/platform/cf/MainThreadSharedTimerCF.cpp:74
Here is some output from lldb: (lldb) p queryData (WebCore::RenderLayerCompositor::RequiresCompositingData) $0 = { layoutUpToDate = Yes nonCompositedForPositionReason = NoNotCompositedReason reevaluateAfterLayout = false } (lldb) p layer (WebCore::RenderLayer) $5 = { WebCore::ScrollableArea = { WTF::CanMakeWeakPtr<WebCore::ScrollableArea> = { m_weakFactory = { m_ref = { m_ptr = 0x0000000000000000 } } } m_scrollAnimator = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::ScrollAnimator *, 0, false> = { __value_ = 0x0000000000000000 } } } m_snapOffsetsInfo = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::ScrollSnapOffsetsInfo<WebCore::LayoutUnit> *, 0, false> = { __value_ = 0x0000000000000000 } } } m_currentHorizontalSnapPointIndex = 0 m_currentVerticalSnapPointIndex = 0 m_scrollOrigin = { x = 0, y = 0 } m_constrainsScrollingToContentEdge = 1 m_inLiveResize = 0 m_verticalScrollElasticity = 1 m_horizontalScrollElasticity = 1 m_scrollbarOverlayStyle = 0 m_scrollOriginChanged = 0 m_scrolledProgrammatically = 0 } m_compositingDirtyBits = { size = 4 } { HasDescendantNeedingRequirementsTraversal = 1 HasDescendantNeedingBackingOrHierarchyTraversal = 2 NeedsGeometryUpdate = 64 NeedsConfigurationUpdate = 128 } m_isRenderViewLayer = false m_forcedStackingContext = false m_isNormalFlowOnly = false m_isStackingContext = true m_zOrderListsDirty = false m_normalFlowListDirty = false m_hadNegativeZOrderList = false m_inResizeMode = false m_scrollDimensionsDirty = false m_isSelfPaintingLayer = true m_hasSelfPaintingLayerDescendant = true m_hasSelfPaintingLayerDescendantDirty = false m_usedTransparency = false m_paintingInsideReflection = false m_inOverflowRelayout = false m_repaintStatus = 0 m_visibleContentStatusDirty = false m_hasVisibleContent = true m_visibleDescendantStatusDirty = false m_hasVisibleDescendant = true m_registeredScrollableArea = false m_isFixedIntersectingViewport = false m_3DTransformedDescendantStatusDirty = false m_has3DTransformedDescendant = false m_hasCompositingDescendant = false m_hasTransformedAncestor = true m_has3DTransformedAncestor = false m_indirectCompositingReason = 0 m_viewportConstrainedNotCompositedReason = 0 m_containsDirtyOverlayScrollbars = false m_updatingMarqueePosition = false m_layerListMutationAllowed = false m_blendMode = 1 m_hasNotIsolatedCompositedBlendingDescendants = false m_hasNotIsolatedBlendingDescendants = false m_hasNotIsolatedBlendingDescendantsStatusDirty = false m_renderer = 0x00000007db100ea0 m_parent = 0x00000007d8e2b2a0 m_previous = 0x0000000000000000 m_next = 0x00000007d8e2b7e0 m_first = 0x00000007d8e2b540 m_last = 0x00000007d8e2b540 m_posZOrderList = { __ptr_ = { std::__1::__compressed_pair_elem<WTF::Vector<WebCore::RenderLayer *, 0, WTF::CrashOnOverflow, 16> *, 0, false> = { __value_ = 0x00000007d8e05ab0 { size = 1, capacity = 16 } } } } m_negZOrderList = { __ptr_ = { std::__1::__compressed_pair_elem<WTF::Vector<WebCore::RenderLayer *, 0, WTF::CrashOnOverflow, 16> *, 0, false> = { __value_ = 0x0000000000000000 { size = 0, capacity = 0 } } } } m_normalFlowList = { __ptr_ = { std::__1::__compressed_pair_elem<WTF::Vector<WebCore::RenderLayer *, 0, WTF::CrashOnOverflow, 16> *, 0, false> = { __value_ = 0x0000000000000000 { size = 0, capacity = 0 } } } } m_offsetForInFlowPosition = { width = 0px (0), height = 0px (0) } m_topLeft = { x = 0px (0), y = 0px (0) } m_layerSize = { width = 249, height = 187 } m_scrollPosition = { x = 0, y = 0 } m_postLayoutScrollPosition = { WTF::OptionalBase<WebCore::IntPoint> = { init_ = false storage_ = (dummy_ = '\0', value_ = { x = 0, y = 0 }) } } m_scrollSize = { width = 249, height = 187 } m_hBar = { m_ptr = 0x0000000000000000 } m_vBar = { m_ptr = 0x0000000000000000 } m_clipRectsCache = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::ClipRectsCache *, 0, false> = { __value_ = 0x0000001c0023d1b8 } } } m_cachedOverlayScrollbarOffset = { x = 0, y = 0 } m_marquee = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::RenderMarquee *, 0, false> = { __value_ = 0x0000000000000000 } } } m_staticInlinePosition = { 0px (0) } m_staticBlockPosition = { 0px (0) } m_transform = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::TransformationMatrix *, 0, false> = { __value_ = 0x0000000000000000 } } } m_reflection = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::RenderReplica *, 0, false> = { __value_ = 0x0000000000000000 } } } m_scrollCorner = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::RenderScrollbarPart *, 0, false> = { __value_ = 0x0000000000000000 } } } m_resizer = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::RenderScrollbarPart *, 0, false> = { __value_ = 0x0000000000000000 } } } m_enclosingPaginationLayer = { m_ref = { m_ptr = 0x0000000000000000 } } m_blockSelectionGapsBounds = { x = 0, y = 0, width = 0, height = 0 } m_filters = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::RenderLayerFilters *, 0, false> = { __value_ = 0x0000000000000000 } } } m_backing = { __ptr_ = { std::__1::__compressed_pair_elem<WebCore::RenderLayerBacking *, 0, false> = { __value_ = 0x0000001c01a5c398 } } } m_paintFrequencyTracker = { m_firstPaintTime = (m_value = 170826.30389103701) m_lastPaintTime = (m_value = 170826.991178608) m_totalPaints = 3 m_paintFrequency = Low } } (lldb) p willBeComposited (bool) $10 = true (lldb) p canBeComposited(layer) (bool) $11 = true (lldb) p requiresCompositingLayer(layer, queryData) (bool) $12 = false (lldb) p layer.mustCompositeForIndirectReasons() (bool) $13 = false (lldb) p usesCompositing() && layer.isRenderViewLayer() (bool) $14 = false
Because of the following: > (lldb) p canBeComposited(layer) > (bool) $11 = true > (lldb) p requiresCompositingLayer(layer, queryData) > (bool) $12 = false > (lldb) p layer.mustCompositeForIndirectReasons() > (bool) $13 = false > (lldb) p usesCompositing() && layer.isRenderViewLayer() > (bool) $14 = false RenderLayerCompositor::needsToBeComposited() returns false.