Application not exiting gracefully if I want close to in CMainWindow ctor

[rawfool]

In QMainWindow, I'm initializing a CWorker class and this CWorker tries to find if a particular shared memory is available. If shared memory isn't available then I should quit the application (i.e., QMainWindow).
I'm trying to check this in try.. catch. So if the control goes to catch, I'm trying to display a QMessageBox & exit(this->close) the application. While doing this, the application is not closing gracefully.

CMainWindow::CMainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ....
    ....
    try
    {
        worker = new CWorker();
    }
    catch(...)
    {
        QMessageBox::information(this, "Title",
                                 "Message text goes here");
        quit();
    }
 
    ....
    ....
    ....
}

CMainWindow::CMainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ....
    ....
    try
    {
        worker = new CWorker();
    }
    catch(...)
    {
        QMessageBox::information(this, "Title",
                                 "Message text goes here");
        quit();
    }

    ....
    ....
    ....
}

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I tried qApp->quit() and QCoreApplication::quit(); also but same result;

Please find the attached screenshot of the error message after the application goes to catch().

QuitApp.jpg