[Webkit-unassigned] [Bug 54123] New: Assertion failure in BackingStore::BackingStore if new WebPage becomes active before receiving a size

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54123

           Summary: Assertion failure in BackingStore::BackingStore if new
                    WebPage becomes active before receiving a size
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: 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: 53805


If a new WebPage becomes active before it receives a size, you'll hit this assertion in BackingStore::BackingStore:

    ASSERT(!m_size.isEmpty());


Continuing past the assertion shows no bad effects, so presumably Release builds are unaffected. Here's the backtrace:

>	WebKit.dll!WebKit::BackingStore::BackingStore(const WebCore::IntSize & size={...}, WebKit::WebPageProxy * webPageProxy=0x09755c90)  Line 49 + 0x2d bytes	C++
     WebKit.dll!WebKit::BackingStore::create(const WebCore::IntSize & size={...}, WebKit::WebPageProxy * webPageProxy=0x09755c90)  Line 42 + 0x23 bytes    C++
     WebKit.dll!WebKit::DrawingAreaProxyImpl::incorporateUpdate(const WebKit::UpdateInfo & updateInfo={...})  Line 203 + 0x14 bytes    C++
     WebKit.dll!WebKit::DrawingAreaProxyImpl::update(unsigned __int64 sequenceNumber=2, const WebKit::UpdateInfo & updateInfo={...})  Line 142    C++
     WebKit.dll!CoreIPC::callMemberFunction<WebKit::DrawingAreaProxy,void (__thiscall WebKit::DrawingAreaProxy::*)(unsigned __int64,WebKit::UpdateInfo const &),unsigned __int64,WebKit::UpdateInfo>(const CoreIPC::Arguments2<unsigned __int64,WebKit::UpdateInfo> & args={...}, WebKit::DrawingAreaProxy * object=0x0972f508, void (unsigned __int64, const WebKit::UpdateInfo &)* function=0x0382cab3)  Line 25 + 0x19 bytes    C++
     WebKit.dll!CoreIPC::handleMessage<Messages::DrawingAreaProxy::Update,WebKit::DrawingAreaProxy,void (__thiscall WebKit::DrawingAreaProxy::*)(unsigned __int64,WebKit::UpdateInfo const &)>(CoreIPC::ArgumentDecoder * argumentDecoder=0x0a218f28, WebKit::DrawingAreaProxy * object=0x0972f508, void (unsigned __int64, const WebKit::UpdateInfo &)* function=0x0382cab3)  Line 246 + 0x11 bytes    C++
     WebKit.dll!WebKit::DrawingAreaProxy::didReceiveDrawingAreaProxyMessage(CoreIPC::Connection * __formal=0x07943920, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x0a218f28)  Line 41 + 0x12 bytes    C++
     WebKit.dll!WebKit::WebPageProxy::didReceiveMessage(CoreIPC::Connection * connection=0x07943920, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x0a218f28)  Line 1169    C++
     WebKit.dll!WebKit::WebProcessProxy::didReceiveMessage(CoreIPC::Connection * connection=0x07943920, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x0a218f28)  Line 245    C++
     WebKit.dll!CoreIPC::Connection::dispatchMessages()  Line 450 + 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=0x00190762, unsigned int message=1025, unsigned int wParam=115649320, long lParam=0)  Line 57    C++
     WebKit.dll!RunLoop::RunLoopWndProc(HWND__ * hWnd=0x00190762, unsigned int message=1025, unsigned int wParam=115649320, long lParam=0)  Line 39 + 0x18 bytes    C++

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