If parameters() method is called for a QApplication that is created by QAxServerBase, application crashes due to accessing a reference to the passed argc argument that went out of scope.

Culprit code is located at QAxServerBase.cpp, QClassFactory::CreateInstanceHelper() method:

if (!qApp) {
    qax_ownQApp = true;
    int argc = 0;
    new QApplication(argc, 0);
}

QCoreApplication seems to save reference to this passed argc argument rather than making a copy of it, even in this case.