Why QT C++ application get crash ?

Qt embedded developer

when my code is reach to destructor of QmlEngineUtility it get crash .

QmlEngineUtility::~QmlEngineUtility
{

}

Below i written the stack and break point output:

1   QThreadStorageData::get() const                                                                                                              0x7ffff3eb952b 
2   QOpenGLContext::currentContext()                                                                                                             0x7ffff49af988 
3   QSurface::~QSurface()                                                                                                                        0x7ffff497bb4c 
4   QWindow::~QWindow()                                                                                                                          0x7ffff497994f 
5   QQuickWindow::~QQuickWindow()                                                                                                                0x7ffff785bb54 
6   QQmlPrivate::QQmlElement<QQuickWindowQmlImpl>::~QQmlElement()                                                                                0x7fffd200677d 
7   QQmlApplicationEnginePrivate::cleanUp()                                                                                                      0x7ffff5ce014e 
8   QQmlApplicationEngine::~QQmlApplicationEngine()                                                                                              0x7ffff5ce0198 
9   QQmlApplicationEngine::~QQmlApplicationEngine()                                                                                              0x7ffff5ce01b9 
10  QtSharedPointer::CustomDeleter<QQmlApplicationEngine, QtSharedPointer::NormalDeleter>::execute                     qsharedpointer_impl.h 187 0x404387       
11  QtSharedPointer::ExternalRefCountWithCustomDeleter<QQmlApplicationEngine, QtSharedPointer::NormalDeleter>::deleter qsharedpointer_impl.h 205 0x4041bb       
12  QtSharedPointer::ExternalRefCountData::destroy                                                                     qsharedpointer_impl.h 149 0x403c7d       
13  QSharedPointer<QQmlApplicationEngine>::deref                                                                       qsharedpointer_impl.h 458 0x4042bc       
14  QSharedPointer<QQmlApplicationEngine>::deref                                                                       qsharedpointer_impl.h 453 0x4040b4       
15  QSharedPointer<QQmlApplicationEngine>::~QSharedPointer                                                             qsharedpointer_impl.h 310 0x403e14       
16  QmlEngineUtility::~QmlEngineUtility                                                                                QmlEngineUtility.cpp  27  0x40ab1a       
17  __run_exit_handlers                                                                                                                          0x7ffff74621e6

Christian Ehrlicher

@Qt-embedded-developer said in Why QT C++ application get crash ?:

QSharedPointer<QQmlApplicationEngine>::~QSharedPointer

You were informed about the problems when using automatic pointers with Qt objects in your last question: https://forum.qt.io/topic/154869/what-is-difference-between-std-unique_ptr-v-s-std-make_unique?_=1709130823393

JonB

@Qt-embedded-developer Can you show an absolutely minimal example of your code which produces this?

AhsanKhan

There can be several reasons. One of them being, accessing a null pointer's members or an out of bounds iterator (which caused my program to crash recently without any error). Provide the code that you've written, so we can see what's happening!

Christian Ehrlicher

@Qt-embedded-developer said in Why QT C++ application get crash ?:

QSharedPointer<QQmlApplicationEngine>::~QSharedPointer

You were informed about the problems when using automatic pointers with Qt objects in your last question: https://forum.qt.io/topic/154869/what-is-difference-between-std-unique_ptr-v-s-std-make_unique?_=1709130823393