Intermittent crash in frame hook

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   Hi, 
We keep having some intermittent crashes reported by customers that we cannot reproduce in dev. The call stack of a typical crash is shown below.

I wonder if someone has any idea what is going on? Or how we can start looking into this? We are using the framework normally as far as I know

Thank you!

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ericgen34 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 July 2019 Location: Salisbury Status: Offline Points: 6	Post Options Post Reply Quote ericgen34 Report Post Thanks(0) Quote Reply Topic: Intermittent crash in frame hook Posted: 22 September 2020 at 5:03am
	Hi, We keep having some intermittent crashes reported by customers that we cannot reproduce in dev. The call stack of a typical crash is shown below. I wonder if someone has any idea what is going on? Or how we can start looking into this? We are using the framework normally as far as I know Thank you!

ericgen34 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 July 2019 Location: Salisbury Status: Offline Points: 6	Post Options Post Reply Quote ericgen34 Report Post Thanks(0) Quote Reply Posted: 22 September 2020 at 5:05am
	Apologies, the call stack screen shot didnt show. Here it is copied: KERNELBASE.dll!_RaiseException@16() Unknown VCRUNTIME140.dll!_CxxThrowException(void * pExceptionObject, const _s__ThrowInfo * pThrowInfo) Line 129 C++ mfc140u.dll!AfxThrowResourceException() Line 1347 C++ > mfc140u.dll!CWindowDC::CWindowDC(CWnd * pWnd) Line 1018 C++ ToolkitPro1900vc150U.dll!CXTPCommandBarsFrameHook::RedrawFrame() Line 627 C++ ToolkitPro1900vc150U.dll!CXTPCommandBarsFrameHook::OnHookMessage(HWND__ * hWnd, unsigned int nMessage, unsigned int & wParam, long & lParam, long & lResult) Line 1025 C++ ToolkitPro1900vc150U.dll!CXTPHookManager::CHookSink::OnHookMessage(HWND__ * hWnd, unsigned int nMessage, unsigned int & wParam, long & lParam, long & lResult) Line 319 C++ ToolkitPro1900vc150U.dll!CXTPHookManager::HookWndProc(HWND__ * hWnd, unsigned int message, unsigned int wParam, long lParam) Line 440 C++ user32.dll!__InternalCallWinProc@20() Unknown user32.dll!UserCallWinProcCheckWow() Unknown user32.dll!DispatchClientMessage() Unknown user32.dll!___fnDWORD@4() Unknown ntdll.dll!_KiUserCallbackDispatcher@12() Unknown user32.dll!RealDefWindowProcWorker() Unknown user32.dll!RealDefWindowProcW() Unknown uxtheme.dll!_ThemeDefWindowProc() Unknown uxtheme.dll!_ThemeDefWindowProcW@16() Unknown user32.dll!DefWindowProcW() Unknown user32.dll!DefWindowProcWorker() Unknown user32.dll!DefDlgProcWorker() Unknown user32.dll!_DefDlgProcW@16() Unknown user32.dll!UserCallWinProcCheckWow() Unknown

agontarenko Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 25 March 2016 Status: Offline Points: 299	Post Options Post Reply Quote agontarenko Report Post Thanks(0) Quote Reply Posted: 25 September 2020 at 2:30am
	Hello, Unfortunately it is not clear what exactly is going wrong. Can you please provide more detailed information. If it cannot be re-produced in any of our sample applications provided I would appreciate you sending a sample application so that we could debug it. Regards, Artem Gontarenko

ericgen34 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 July 2019 Location: Salisbury Status: Offline Points: 6	Post Options Post Reply Quote ericgen34 Report Post Thanks(0) Quote Reply Posted: 25 September 2020 at 3:31am
	Well, we cant reproduce it either, and the application is rather big, I cant really send a sample I'm afraid. I just wondered if there are specific areas to look into

rdhd Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 August 2007 Location: United States Status: Offline Points: 891	Post Options Post Reply Quote rdhd Report Post Thanks(0) Quote Reply Posted: 02 October 2020 at 5:47pm
	It would appear the input window to the constructor is not a valid window during the entire call to the constructor. Are you threading? MFC isn't thread safe. A lot can go on while this code executes: ASSERT(pWnd == NULL \|\| ::IsWindow(pWnd->m_hWnd)); if (!Attach(::GetWindowDC(m_hWnd = pWnd->GetSafeHwnd()))) The first line is only executed for debug builds. If you want to validate a window during release builds, you have to make the IsWindow call before calling the constructor. If a thread takes over while doing "m_hWnd = ...) no the m_hWnd could be bad before the call to Attach is made.