(gdb) bt full
#0  0x00007ffff6980eb6 in QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::data (this=0x8)
    at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:135
No locals.
#1  0x00007ffff69a7ea1 in qGetPtrHelper<QScopedPointer<QObjectData> > (p=...)
    at ../../include/QtCore/../../src/corelib/global/qglobal.h:962
No locals.
#2  0x00007ffff69a7ec0 in QObject::d_func (this=0x0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:110
No locals.
#3  0x00007ffff6c6b869 in QMetaObject::activate (sender=0x0, signalOffset=8, local_signal_index=1, argv=0x7fffffffd8c0)
    at kernel/qobject.cpp:3592
        signal_index = 9
        empty_argv = {0x7fffffffd830}
        currentThreadId = 0x7fffffffd870
        __PRETTY_FUNCTION__ = "static void QMetaObject::activate(QObject*, int, int, void**)"
#4  0x00007ffff6c6b73c in QMetaObject::activate (sender=0x0, m=0x7ffff75ce840 <QGuiApplication::staticMetaObject>,
    local_signal_index=1, argv=0x7fffffffd8c0) at kernel/qobject.cpp:3582
No locals.
#5  0x00007ffff702a92b in QGuiApplication::screenAdded (this=0x0, _t1=0x43fa00) at .moc/moc_qguiapplication.cpp:321
        _a = {0x0, 0x7fffffffd8b0}
#6  0x00007ffff7013cf1 in QPlatformIntegration::screenAdded (this=0x0, ps=0x43fd40) at kernel/qplatformintegration.cpp:439
        screen = 0x43fa00
#7  0x00007ffff014932d in QXcbConnection::updateScreens (this=0x4301a0) at qxcbconnection.cpp:303
        screen = 0x43fd40
        _container_ = {c = {<QListSpecialMethods<QXcbScreen*>> = {<No data fields>}, {p = {static shared_null = {ref = {
                    atomic = {_q_value = -1}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x444bc0},
              d = 0x444bc0}}, i = {i = 0x444bd0}, e = {i = 0x444bd8}, control = 1}
        it = {data = 0x437604, rem = 0, index = 2976}
        screenNumber = 1
        xcbScreenNumber = 1
        activeScreens = {q_hash = {{d = 0x43fe40, e = 0x43fe40}}}
        newScreens = {<QListSpecialMethods<QXcbScreen*>> = {<No data fields>}, {p = {static shared_null = {ref = {
                  atomic = {_q_value = -1}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x444b60}, d = 0x444b60}}
        primaryScreen = 0x43fd40
        __PRETTY_FUNCTION__ = "void QXcbConnection::updateScreens()"
#8  0x00007ffff014988c in QXcbConnection::QXcbConnection (this=0x4301a0, nativeInterface=0x424570, canGrabServer=false,
---Type <return> to continue, or q <return> to quit---
    displayName=0x0) at qxcbconnection.cpp:383
        dpy = 0x4304e0
        extensions = {0x7fffef0bf060 <xcb_shm_id>, 0x7fffef2c7060 <xcb_xfixes_id>, 0x7fffeeebb110 <xcb_randr_id>,
          0x7fffeecad050 <xcb_shape_id>, 0x7ffff12d40b0 <xcb_sync_id>, 0x7fffee8a6230 <xcb_xkb_id>,
          0x7fffef8db0b0 <xcb_render_id>, 0x7ffff1af8050 <xcb_glx_id>, 0x0}
        __PRETTY_FUNCTION__ = "QXcbConnection::QXcbConnection(QXcbNativeInterface*, bool, const char*)"
#9  0x00007ffff01530da in QXcbIntegration::QXcbIntegration (this=0x423840, parameters=..., argc=@0x7fffffffe2cc: 1,
    argv=0x7fffffffe4b8) at qxcbintegration.cpp:174
        displayName = 0x0
        noGrabArg = false
        doGrabArg = false
        underDebugger = true
        canNotGrabEnv = false
        __PRETTY_FUNCTION__ = "QXcbIntegration::QXcbIntegration(const QStringList&, int&, char**)"
#10 0x00007ffff0173c99 in QXcbIntegrationPlugin::create (this=0x423df0, system=..., parameters=...,
    argc=@0x7fffffffe2cc: 1, argv=0x7fffffffe4b8) at qxcbmain.cpp:50
No locals.
#11 0x00007ffff7015fa7 in loadIntegration (
    loader=0x7ffff75e12c0 <_ZZN12_GLOBAL__N_112Q_QGS_loader13innerFunctionEvE6holder>, key=..., parameters=...,
    argc=@0x7fffffffe2cc: 1, argv=0x7fffffffe4b8) at kernel/qplatformintegrationfactory.cpp:56
        result = 0x7ffff701636e <QGlobalStatic<QFactoryLoader, (anonymous namespace)::Q_QGS_loader::innerFunction, (anonymous namespace)::Q_QGS_loader::guard>::operator()()+40>
        factory = 0x423df0
        index = 7
#12 0x00007ffff7016060 in QPlatformIntegrationFactory::create (platform=..., paramList=..., argc=@0x7fffffffe2cc: 1,
    argv=0x7fffffffe4b8, platformPluginPath=...) at kernel/qplatformintegrationfactory.cpp:73
        ret = 0x7fffffffdec0
#13 0x00007ffff7021c0d in init_platform (pluginArgument=..., platformPluginPath=..., platformThemeName=...,
    argc=@0x7fffffffe2cc: 1, argv=0x7fffffffe4b8) at kernel/qguiapplication.cpp:1010
        arguments = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {
                  ref = {atomic = {_q_value = -1}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x420e70},
              d = 0x420e70}}, <No data fields>}
        name = {static null = {<No data fields>}, d = 0x4210c0}
        argumentsKey = {static null = {<No data fields>}, d = 0x4211f0}
        __PRETTY_FUNCTION__ = "void init_platform(const QString&, const QString&, const QString&, int&, char**)"
---Type <return> to continue, or q <return> to quit---
        themeNames = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {
                  ref = {atomic = {_q_value = -1}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x0},
              d = 0x0}}, <No data fields>}
#14 0x00007ffff7022e46 in QGuiApplicationPrivate::createPlatformIntegration (this=0x41fab0)
    at kernel/qguiapplication.cpp:1165
        platformPluginPath = {static null = {<No data fields>}, d = 0x7ffff6d07340 <qt_array>}
        platformName = {static MaxSize = 1073741800, d = 0x420e40}
        platformNameEnv = {static MaxSize = 1073741800, d = 0x7ffff6d07300 <QArrayData::shared_null>}
        platformThemeName = {static null = {<No data fields>}, d = 0x7ffff6d07340 <qt_array>}
        icon = {static null = {<No data fields>}, d = 0x40cea0 <QArrayData::shared_null>}
        j = 1
#15 0x00007ffff7022faf in QGuiApplicationPrivate::createEventDispatcher (this=0x41fab0) at kernel/qguiapplication.cpp:1182
No locals.
#16 0x00007ffff7751226 in QApplicationPrivate::createEventDispatcher (this=0x41fab0) at kernel/qapplication.cpp:187
No locals.
#17 0x00007ffff6c28062 in QCoreApplication::init (this=0x7fffffffe390) at kernel/qcoreapplication.cpp:730
        d = 0x41fab0
#18 0x00007ffff6c27e17 in QCoreApplication::QCoreApplication (this=0x7fffffffe390, p=...)
    at kernel/qcoreapplication.cpp:655
No locals.
#19 0x00007ffff7020a23 in QGuiApplication::QGuiApplication (this=0x7fffffffe390, p=...) at kernel/qguiapplication.cpp:559
No locals.
#20 0x00007ffff7751b71 in QApplication::QApplication (this=0x7fffffffe390, argc=@0x7fffffffe2cc: 1, argv=0x7fffffffe4b8,
    _internal=328706) at kernel/qapplication.cpp:562
No locals.
#21 0x00000000004044a3 in main (argc=1, argv=0x7fffffffe4b8) at main.cpp:50
        app = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {
                _vptr.QObject = 0x7ffff6f288c0 <vtable for QCoreApplication+16>, static staticMetaObject = {d = {
                    superdata = 0x0, stringdata = 0x7ffff6dd09e0 <qt_meta_stringdata_QObject>,
                    data = 0x7ffff6dd0b00 <qt_meta_data_QObject>,
                    static_metacall = 0x7ffff6c6e6d2 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x41fab0}, static staticQtMetaObject = {d = {superdata = 0x0,
                    stringdata = 0x7ffff6e1e3c0 <qt_meta_stringdata_Qt>, data = 0x7ffff6e28740 <qt_meta_data_Qt>,
                    static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {
                  superdata = 0x7ffff6f2a6c0 <QObject::staticMetaObject>,
---Type <return> to continue, or q <return> to quit---
                  stringdata = 0x7ffff6e35460 <qt_meta_stringdata_QCoreApplication>,
                  data = 0x7ffff6e35680 <qt_meta_data_QCoreApplication>,
                  static_metacall = 0x7ffff6cfcd06 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7fffffffe390}, static staticMetaObject = {d = {
                superdata = 0x7ffff6f28880 <QCoreApplication::staticMetaObject>,
                stringdata = 0x7ffff7440cc0 <qt_meta_stringdata_QGuiApplication>,
                data = 0x7ffff74411a0 <qt_meta_data_QGuiApplication>,
                static_metacall = 0x7ffff702a180 <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {
              superdata = 0x7ffff75ce840 <QGuiApplication::staticMetaObject>,
              stringdata = 0x7ffff7bcaee0 <qt_meta_stringdata_QApplication>,
              data = 0x7ffff7bcb200 <qt_meta_data_QApplication>,
              static_metacall = 0x7ffff775dee4 <QApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        mainWin = {<QMainWindow> = {<QWidget> = {<QObject> = {_vptr.QObject = 0x7fffffffe380, static staticMetaObject = {
                  d = {superdata = 0x0, stringdata = 0x7ffff6dd09e0 <qt_meta_stringdata_QObject>,
                    data = 0x7ffff6dd0b00 <qt_meta_data_QObject>,
                    static_metacall = 0x7ffff6c6e6d2 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7ffff7de9e07 <_dl_fixup+247>}, static staticQtMetaObject = {
                  d = {superdata = 0x0, stringdata = 0x7ffff6e1e3c0 <qt_meta_stringdata_Qt>,
                    data = 0x7ffff6e28740 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0,
                    extradata = 0x0}}}, <QPaintDevice> = {_vptr.QPaintDevice = 0x7fff00000001, painters = 0,
                reserved = 0x40a060 <qt_resource_name>}, static staticMetaObject = {d = {
                  superdata = 0x7ffff6f2a6c0 <QObject::staticMetaObject>,
                  stringdata = 0x7ffff7bd0f60 <qt_meta_stringdata_QWidget>, data = 0x7ffff7bd1ce0 <qt_meta_data_QWidget>,
                  static_metacall = 0x7ffff77b4690 <QWidget::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, data = 0x7ffff58108d0}, static staticMetaObject = {d = {
                superdata = 0x7ffff7db1660 <QWidget::staticMetaObject>,
                stringdata = 0x7ffff7c94680 <qt_meta_stringdata_QMainWindow>,
                data = 0x7ffff7c94a80 <qt_meta_data_QMainWindow>,
                static_metacall = 0x7ffff7bb8bfa <QMainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x7ffff7dd2500 <qt_meta_extradata_QMainWindow>, extradata = 0x0}}}, static staticMetaObject = {d = {
              superdata = 0x7ffff7dd2520 <QMainWindow::staticMetaObject>,
              stringdata = 0x40a1a0 <qt_meta_stringdata_MainWindow>, data = 0x40a2a0 <qt_meta_data_MainWindow>,
              static_metacall = 0x40748c <MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
---Type <return> to continue, or q <return> to quit---
              relatedMetaObjects = 0x0, extradata = 0x0}}, textEdit = 0x1, curFile = {static null = {<No data fields>},
            d = 0x7fffffffe380}, fileMenu = 0x40cc00, editMenu = 0x7ffff7df0325 <_dl_runtime_resolve+53>, helpMenu = 0x1,
          fileToolBar = 0x41ec38, editToolBar = 0x40cbe8, newAct = 0x40741c
     <(anonymous namespace)::initializer::~initializer()>, openAct = 0x40cbe8, saveAct = 0x7ffff583fe49 <__cxa_atexit+25>,
          saveAsAct = 0x1, exitAct = 0x7fffffffe380, cutAct = 0x40cc00,
          copyAct = 0x407473 <__static_initialization_and_destruction_0(int, int)+67>, pasteAct = 0x7ffff58181a8,
          aboutAct = 0x10000ffff, aboutQtAct = 0x7fffffffe390}