[Webkit-unassigned] [Bug 53878] New: Assertion failure in DrawingAreaImpl::resumePainting when opening Web Inspector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=53878

           Summary: Assertion failure in DrawingAreaImpl::resumePainting
                    when opening Web Inspector
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: NeedsRadar, PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: andersca at apple.com
            Blocks: 53877


To reproduce:

1. Set WEBKIT2_USE_NEW_DRAWING_AREA=1 and launch your WebKit2 browser
2. Right-click on the page and choose Inspect Element

You'll hit an assertion in DrawingAreaImpl::resumePainting:

    ASSERT(m_isPaintingSuspended);

Here's the backtrace:

>	WebKit.dll!WebKit::DrawingAreaImpl::resumePainting()  Line 222 + 0x2c bytes	C++
     WebKit.dll!CoreIPC::callMemberFunction<WebKit::DrawingArea,void (__thiscall WebKit::DrawingArea::*)(void)>(const CoreIPC::Arguments0 & __formal={...}, WebKit::DrawingArea * object=0x07504d38, void (void)* function=0x1000f420)  Line 13 + 0xb bytes    C++
     WebKit.dll!CoreIPC::handleMessage<Messages::DrawingArea::ResumePainting,WebKit::DrawingArea,void (__thiscall WebKit::DrawingArea::*)(void)>(CoreIPC::ArgumentDecoder * argumentDecoder=0x070fada8, WebKit::DrawingArea * object=0x07504d38, void (void)* function=0x1000f420)  Line 227 + 0x15 bytes    C++
     WebKit.dll!WebKit::DrawingArea::didReceiveDrawingAreaMessage(CoreIPC::Connection * __formal=0x0238e208, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x070fada8)  Line 49 + 0x23 bytes    C++
     WebKit.dll!WebKit::WebPage::didReceiveMessage(CoreIPC::Connection * connection=0x0238e208, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x070fada8)  Line 1662    C++
     WebKit.dll!WebKit::WebProcess::didReceiveMessage(CoreIPC::Connection * connection=0x0238e208, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x070fada8)  Line 537    C++
     WebKit.dll!CoreIPC::Connection::dispatchMessages()  Line 441 + 0x31 bytes    C++
     WebKit.dll!MemberFunctionWorkItem0<CoreIPC::Connection>::execute()  Line 76 + 0x10 bytes    C++
     WebKit.dll!RunLoop::performWork()  Line 63 + 0x1a bytes    C++
     WebKit.dll!RunLoop::wndProc(HWND__ * hWnd=0x00040bec, unsigned int message=1025, unsigned int wParam=37276896, long lParam=0)  Line 57    C++
     WebKit.dll!RunLoop::RunLoopWndProc(HWND__ * hWnd=0x00040bec, unsigned int message=1025, unsigned int wParam=37276896, long lParam=0)  Line 39 + 0x18 bytes    C++
     user32.dll!_InternalCallWinProc at 20()  + 0x28 bytes    
     user32.dll!_UserCallWinProcCheckWow at 32()  + 0xb7 bytes    
     user32.dll!_DispatchMessageWorker at 8()  + 0xdc bytes    
     user32.dll!_DispatchMessageW at 4()  + 0xf bytes    
     WebKit.dll!RunLoop::run()  Line 73 + 0xc bytes    C++
     WebKit.dll!WebKit::WebProcessMain(const WebKit::CommandLine & commandLine={...})  Line 82    C++
     WebKit.dll!WebKitMain(const WebKit::CommandLine & commandLine={...})  Line 48 + 0x9 bytes    C++
     WebKit.dll!WebKitMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpstrCmdLine=0x0002114c, int nCmdShow=10)  Line 172 + 0x9 bytes    C++
     WebKit2WebProcess.exe!wWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpstrCmdLine=0x0002114c, int nCmdShow=10)  Line 44 + 0x18 bytes    C++
     WebKit2WebProcess.exe!__tmainCRTStartup()  Line 589 + 0x1c bytes    C
     kernel32.dll!_BaseProcessStart at 4()  + 0x23 bytes

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