Segfault when connect cleanup OpenGL function to signal QOpenGLContext::aboutToBeDestroyed



  • Hi I am using the QOpenGLWidget of Qt 5.9.2 on Ubuntu16.04. Using the following connect() to clean up OpenGL buffer objects but get segment fault when destroy buffer objects. So I ended up putting cleanup() in the destructor. I remembered this signal ::aboutToBeDestroyed is recommended to do cleanup to the destructor but why it does not work now.

    Does not work:

    connect(context(), &QOpenGLContext::aboutToBeDestroyed, this, &MainOpenGLWidget::cleanup);
    
    void MainOpenGLWidget::cleanup()
    {
        makeCurrent();
    
        if (m_program)
        {
            delete m_program;
            m_program = 0;
        }
    
        if (m_vboPos.isCreated())
            m_vboPos.destroy(); // Segfault here
    
        if (m_vboCol.isCreated())
            m_vboCol.destroy();
    
        if (m_vao.isCreated())
            m_vao.destroy();
    
        doneCurrent();
    }
    

    This works:

    MainOpenGLWidget::~MainOpenGLWidget()
    {
        cleanup();
    }
    

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