Bug 42707 – Assertion failure in ArgumentDecoder::decodeBytes when launching MiniBrowser on Windows

• Component: WebKit2
• Status: RESOLVED FIXED

[Adam Roben (:aroben)]

To reproduce:

1. Launch MiniBrowser with a debug build of WebKit

You'll hit an assertion in ArgumentDecoder::decodeBytes:

    ASSERT(size == bufferSize);

size is 0, bufferSize is 16.

Here's the backtrace:


>	WebKit.dll!CoreIPC::ArgumentDecoder::decodeBytes(unsigned char * buffer=0x01d9377c, unsigned int bufferSize=16)  Line 103 + 0x34 bytes	C++
 	WebKit.dll!CoreIPC::ArgumentCoder<WebCore::String>::decode(CoreIPC::ArgumentDecoder * decoder=0x01d98978, WebCore::String & s={})  Line 61 + 0x12 bytes	C++
 	WebKit.dll!CoreIPC::ArgumentDecoder::decode<WebCore::String>(WebCore::String & t={})  Line 58 + 0xd bytes	C++
 	WebKit.dll!CoreIPC::Arguments1<WebCore::String &>::decode(CoreIPC::ArgumentDecoder & decoder={...}, CoreIPC::Arguments1<WebCore::String &> & result={...})  Line 71	C++
 	WebKit.dll!CoreIPC::ArgumentCoder<CoreIPC::Arguments1<WebCore::String &> >::decode(CoreIPC::ArgumentDecoder * decoder=0x01d98978, CoreIPC::Arguments1<WebCore::String &> & t={...})  Line 44 + 0xd bytes	C++
 	WebKit.dll!CoreIPC::ArgumentDecoder::decode<CoreIPC::Arguments1<WebCore::String &> >(CoreIPC::Arguments1<WebCore::String &> & t={...})  Line 58 + 0xd bytes	C++
 	WebKit.dll!CoreIPC::ArgumentDecoder::decode<CoreIPC::Arguments1<WebCore::String &> >(const CoreIPC::Arguments1<WebCore::String &> & t={...})  Line 66	C++
 	WebKit.dll!WebKit::WebProcess::didReceiveMessage(CoreIPC::Connection * connection=0x01d987d0, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x01d98978)  Line 170 + 0x1c bytes	C++
 	WebKit.dll!CoreIPC::Connection::dispatchMessages()  Line 254 + 0x2e bytes	C++
 	WebKit.dll!MemberFunctionWorkItem0<CoreIPC::Connection>::execute()  Line 71 + 0x10 bytes	C++
 	WebKit.dll!RunLoop::performWork()  Line 62 + 0x1a bytes	C++
 	WebKit.dll!RunLoop::wndProc(HWND__ * hWnd=0x00040478, unsigned int message=1025, unsigned int wParam=31033168, long lParam=0)  Line 56	C++
 	WebKit.dll!RunLoop::RunLoopWndProc(HWND__ * hWnd=0x00040478, unsigned int message=1025, unsigned int wParam=31033168, long lParam=0)  Line 38 + 0x18 bytes	C++
 	user32.dll!_InternalCallWinProc@20()  + 0x28 bytes	
 	user32.dll!_UserCallWinProcCheckWow@32()  + 0xb7 bytes	
 	user32.dll!_DispatchMessageWorker@8()  + 0xdc bytes	
 	user32.dll!_DispatchMessageW@4()  + 0xf bytes	
 	WebKit.dll!RunLoop::run()  Line 72 + 0xc bytes	C++
 	WebKit.dll!WebKit::WebProcessMain(WebKit::CommandLine * commandLine=0x0012fed0)  Line 58	C++
 	WebKit.dll!WebKitMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpstrCmdLine=0x00021004, int nCmdShow=10)  Line 96 + 0x9 bytes	C++
 	WebKit2WebProcess.exe!wWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpstrCmdLine=0x00021004, int nCmdShow=10)  Line 44 + 0x18 bytes	C++
 	WebKit2WebProcess.exe!__tmainCRTStartup()  Line 589 + 0x1c bytes	C
 	kernel32.dll!_BaseProcessStart@4()  + 0x23 bytes

[Adam Roben (:aroben)]

Fixed in r63790