ASSERT(data) fails in DocumentLoader::dataReceived WinCairo Debug r277448. 1. Invoke "python.exe .\Tools\Scripts\run-webkit-httpd" as Admin 2. Start WinCairo Debug MiniBrowser .\WebKitBuild\Debug\bin64\MiniBrowser.exe 3. Open http://localhost:8800/WebKit/misc/last-modified-parsing.html 4. Reload 5. Crash Callstack: WTF.dll!WTFCrash() Line 305 C++ WebKit2.dll!WTFCrashWithInfo(int __formal, const char * __formal, const char * __formal, int __formal) Line 696 C++ WebKit2.dll!WebCore::DocumentLoader::dataReceived(const char * data, int length) Line 1260 C++ WebKit2.dll!WebCore::DocumentLoader::dataReceived(WebCore::CachedResource & resource, const char * data, int length) Line 1251 C++ WebKit2.dll!WebCore::CachedRawResource::didAddClient::__l2::void <lambda>(WebCore::ResourceRequest &&)::__l2::<lambda>() Line 172 C++ WebKit2.dll!WTF::Detail::CallableWrapper<void <lambda>(void),void>::call() Line 52 C++ WebKit2.dll!WTF::Function<void __cdecl(void)>::operator()() Line 84 C++ WebKit2.dll!WTF::CompletionHandler<void __cdecl(void)>::operator()() Line 67 C++ WebKit2.dll!WebCore::DocumentLoader::responseReceived::__l2::<lambda>(WebCore::PolicyAction policy, WebCore::PolicyCheckIdentifier responseIdentifier) Line 951 C++ WebKit2.dll!WTF::Detail::CallableWrapper<void <lambda>(WebCore::PolicyAction, WebCore::PolicyCheckIdentifier),void,enum WebCore::PolicyAction,WebCore::PolicyCheckIdentifier>::call(WebCore::PolicyAction <in_0>, WebCore::PolicyCheckIdentifier <in_1>) Line 52 C++ WebKit2.dll!WTF::Function<void __cdecl(enum WebCore::PolicyAction,WebCore::PolicyCheckIdentifier)>::operator()(WebCore::PolicyAction <in_0>, WebCore::PolicyCheckIdentifier <in_1>) Line 84 C++ WebKit2.dll!WebKit::WebFrame::didReceivePolicyDecision(unsigned __int64 listenerID, WebKit::PolicyDecision && policyDecision) Line 288 C++ WebKit2.dll!WebKit::WebPage::didReceivePolicyDecision(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType> frameID, unsigned __int64 listenerID, WebKit::PolicyDecision && policyDecision, const WebKit::SandboxExtension::HandleArray & networkExtensionsHandles) Line 3499 C++ WebKit2.dll!IPC::callMemberFunctionImpl<WebKit::WebPage,void (__cdecl WebKit::WebPage::*)(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision &&,WebKit::SandboxExtension::HandleArray const &),std::tuple<WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision,WebKit::SandboxExtension::HandleArray>,0,1,2,3>(WebKit::WebPage * object, void(WebKit::WebPage::*)(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>, unsigned __int64, WebKit::PolicyDecision &&, const WebKit::SandboxExtension::HandleArray &) function, std::tuple<WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision,WebKit::SandboxExtension::HandleArray> && args, std::integer_sequence<unsigned __int64,0,1,2,3> __formal) Line 44 C++ WebKit2.dll!IPC::callMemberFunction<WebKit::WebPage,void (__cdecl WebKit::WebPage::*)(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision &&,WebKit::SandboxExtension::HandleArray const &),std::tuple<WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision,WebKit::SandboxExtension::HandleArray>,std::integer_sequence<unsigned __int64,0,1,2,3>>(std::tuple<WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision,WebKit::SandboxExtension::HandleArray> && args, WebKit::WebPage * object, void(WebKit::WebPage::*)(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>, unsigned __int64, WebKit::PolicyDecision &&, const WebKit::SandboxExtension::HandleArray &) function) Line 50 C++ WebKit2.dll!IPC::handleMessage<Messages::WebPage::DidReceivePolicyDecision,WebKit::WebPage,void (__cdecl WebKit::WebPage::*)(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>,unsigned __int64,WebKit::PolicyDecision &&,WebKit::SandboxExtension::HandleArray const &)>(IPC::Decoder & decoder, WebKit::WebPage * object, void(WebKit::WebPage::*)(WTF::ObjectIdentifier<enum WebCore::FrameIdentifierType>, unsigned __int64, WebKit::PolicyDecision &&, const WebKit::SandboxExtension::HandleArray &) function) Line 120 C++ WebKit2.dll!WebKit::WebPage::didReceiveWebPageMessage(IPC::Connection & connection, IPC::Decoder & decoder) Line 3284 C++ WebKit2.dll!WebKit::WebPage::didReceiveMessage(IPC::Connection & connection, IPC::Decoder & decoder) Line 4946 C++ WebKit2.dll!IPC::MessageReceiverMap::dispatchMessage(IPC::Connection & connection, IPC::Decoder & decoder) Line 130 C++ WebKit2.dll!WebKit::WebProcess::didReceiveMessage(IPC::Connection & connection, IPC::Decoder & decoder) Line 852 C++ WebKit2.dll!IPC::Connection::dispatchMessage(IPC::Decoder & decoder) Line 1052 C++ WebKit2.dll!IPC::Connection::dispatchMessage(std::unique_ptr<IPC::Decoder,std::default_delete<IPC::Decoder>> message) Line 1098 C++ WebKit2.dll!IPC::Connection::dispatchOneIncomingMessage() Line 1166 C++ WebKit2.dll!IPC::Connection::enqueueIncomingMessage::__l2::<lambda>() Line 1021 C++ WebKit2.dll!WTF::Detail::CallableWrapper<void <lambda>(void),void>::call() Line 52 C++ WTF.dll!WTF::Function<void __cdecl(void)>::operator()() Line 84 C++ WTF.dll!WTF::RunLoop::performWork() Line 134 C++ WTF.dll!WTF::RunLoop::wndProc(HWND__ * hWnd, unsigned int message, unsigned __int64 wParam, __int64 lParam) Line 57 C++ WTF.dll!WTF::RunLoop::RunLoopWndProc(HWND__ * hWnd, unsigned int message, unsigned __int64 wParam, __int64 lParam) Line 39 C++ [External Code] WTF.dll!WTF::RunLoop::run() Line 74 C++ WebKit2.dll!WebKit::AuxiliaryProcessMainBase<WebKit::WebProcess,1>::run(int argc, char * * argv) Line 71 C++ WebKit2.dll!WebKit::AuxiliaryProcessMain<WebKit::WebProcessMainWin>(int argc, char * * argv) Line 97 C++ WebKit2.dll!WebKit::WebProcessMain(int argc, char * * argv) Line 58 C++ WebKitWebProcess.exe!main(int argc, char * * argv) Line 35 C++ [External Code]
While this is obviously hitting a bug (probably in the WinCairo port), the issue was probably unnecessarily triggered by a rewrite of this test, and can be worked around in some way.
(In reply to Alexey Proskuryakov from comment #1) > While this is obviously hitting a bug (probably in the WinCairo port), the > issue was probably unnecessarily triggered by a rewrite of this test, and > can be worked around in some way. No, http/wpt/misc/last-modified-parsing.html doesn't trigger this assertion failure. You need to manually reloading the test content to reproduce it. I found this assertion failure while debugging http/wpt/misc/last-modified-parsing.html test failure of Windows ports (Bug 209455). r277408 updated AppleWin's TestExpectations, but WinCairo's. That was the reason I noticed and looked into the test failure.
<rdar://problem/78297185>
Doesn't reproduce on macOS.
Thank you for the checking. WebResourceLoader::didReceiveResource checks data size is not zero, but WebResourceLoader::didReceiveData doesn't. https://github.com/WebKit/WebKit/blob/448d79ba91dea24fa503667995b4189733898f07/Source/WebKit/WebProcess/Network/WebResourceLoader.cpp#L313,L314 WinCairo and PlayStation ports seem the only port disabling ENABLE_SHAREABLE_RESOURCE. They should consider enabling it.