I was trying to perform exception handling manually (through a call to language specific handler function) inside a VEH. This is the code:

DWORD64 imagebase;
LONG handler(EXCEPTION_POINTERS* ex) {

    if (ex->ExceptionRecord->ExceptionCode == 0xE06D7363) {
        const int maxFrames = 62;
        void* frames[maxFrames];
        USHORT framesCaptured = RtlCaptureStackBackTrace(0, maxFrames, frames, nullptr);
        void* handler_data = NULL;
        uint64_t establisher_frame = NULL;
        for (USHORT i = 0; i < framesCaptured; ++i)
        {

            auto lookup = RtlLookupFunctionEntry((DWORD64)frames[i],&imagebase,NULL);
            UNWIND_INFO* ui = (UNWIND_INFO*)(imagebase + lookup->UnwindInfoAddress);
            
            if (ui->Flags == UNW_FLAG_EHANDLER) {
                auto language_handler = RtlVirtualUnwind(UNW_FLAG_EHANDLER, imagebase, (DWORD64)frames[i], lookup, ex->ContextRecord, &handler_data, &establisher_frame, NULL);
                DISPATCHER_CONTEXT new_dc = {};
                new_dc.ControlPc = (DWORD64)frames[i];
                new_dc.ImageBase = imagebase;
                new_dc.FunctionEntry = lookup;
                new_dc.EstablisherFrame = establisher_frame;
                new_dc.TargetIp = reinterpret_cast<uint64_t>(&lookup);
                new_dc.ContextRecord = ex->ContextRecord;
                new_dc.LanguageHandler = language_handler;
                new_dc.HandlerData = handler_data;

                auto result = language_handler(ex->ExceptionRecord, reinterpret_cast<void*>(establisher_frame), ex->ContextRecord, &new_dc);
                return result;
            }

        }

        return EXCEPTION_CONTINUE_EXECUTION;
    }
    return  EXCEPTION_CONTINUE_SEARCH;
        
        

        

}
void excep() {

    try {
        int k = 0;
        throw (k);
    }

    catch (int j) {
        std::cout << j;
    }
}

int main() {



    AddVectoredExceptionHandler(1, handler);

    excep();
    
    return 0;
}

Firsty, I installed a VEH that would catch only exceptions with 0xE06D7363 code, which the code that RaiseException() uses when throing C++ Exceptions (try,throw,catch).I did a stack trace using RtlCaptureStackBackTrace() and then get the function entries with RtlLookupFunctionEntry in order to pass the arguments that RtlVirtualUnwind needs to make a call to language specific handler. The code breaks when RtlVirtualUnwind is called.Any ideas?