#0  0x00007ffff051db94 in QXcbScreen::screen (this=0x0)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbscreen.h:113
#1  0x00007ffff0527f0a in QXcbScreen::root (this=0x0)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbscreen.h:114
#2  0x00007ffff0549bd7 in QXcbWindow::handleClientMessageEvent (this=0x13b6e30, event=0x7fffe8007400)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbwindow.cpp:1919
#3  0x00007ffff052637f in QXcbConnection::handleClientMessageEvent (this=0x6207c0, 
    event=0x7fffe8007400)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1455
#4  0x00007ffff05248a1 in QXcbConnection::handleXcbEvent (this=0x6207c0, event=0x7fffe8007400)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1026
#5  0x00007ffff0526103 in QXcbConnection::processXcbEvents (this=0x6207c0)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1418
#6  0x00007ffff058b380 in QXcbConnection::qt_static_metacall (_o=0x6207c0, 
    _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fffe8007380) at .moc/moc_qxcbconnection.cpp:187
#7  0x00007ffff6c903e3 in QMetaCallEvent::placeMetaCall (this=0x7fffe8007840, object=0x6207c0)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qobject.cpp:486
#8  0x00007ffff6c9153c in QObject::event (this=0x6207c0, e=0x7fffe8007840)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qobject.cpp:1246
#9  0x00007ffff0527253 in QXcbConnection::event (this=0x6207c0, e=0x7fffe8007840)
    at /home/user/work/qt/git/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:2014
#10 0x00007ffff714bf2c in QApplicationPrivate::notify_helper (this=0x613870, receiver=0x6207c0, 
    e=0x7fffe8007840) at /home/user/work/qt/git/qtbase/src/widgets/kernel/qapplication.cpp:3717
#11 0x00007ffff714939d in QApplication::notify (this=0x7fffffffdc10, receiver=0x6207c0, 
    e=0x7fffe8007840) at /home/user/work/qt/git/qtbase/src/widgets/kernel/qapplication.cpp:3161
#12 0x00007ffff6c58296 in QCoreApplication::notifyInternal (this=0x7fffffffdc10, receiver=0x6207c0, 
    event=0x7fffe8007840)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qcoreapplication.cpp:965
#13 0x00007ffff6c5c06b in QCoreApplication::sendEvent (receiver=0x6207c0, event=0x7fffe8007840)
    at ../../include/QtCore/../../../../git/qtbase/src/corelib/kernel/qcoreapplication.h:224
#14 0x00007ffff6c595e3 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, 
    data=0x613310) at /home/user/work/qt/git/qtbase/src/corelib/kernel/qcoreapplication.cpp:1593
#15 0x00007ffff6c58f76 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qcoreapplication.cpp:1451
#16 0x00007ffff6cd0828 in postEventSourceDispatch (s=0x6359a0)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:271
#17 0x00007ffff4616e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff4617048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ffff46170ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007ffff6cd0fff in QEventDispatcherGlib::processEvents (this=0x63ac30, flags=...)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:418
#21 0x00007ffff058c6a6 in QPAEventDispatcherGlib::processEvents (this=0x63ac30, flags=...)
    at /home/user/work/qt/git/qtbase/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp:115
#22 0x00007ffff6c54d6a in QEventLoop::processEvents (this=0x7fffffffd3c0, flags=...)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qeventloop.cpp:128
#23 0x00007ffff6c5503f in QEventLoop::exec (this=0x7fffffffd3c0, flags=...)
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qeventloop.cpp:204
#24 0x00007ffff6c5899c in QCoreApplication::exec ()
    at /home/user/work/qt/git/qtbase/src/corelib/kernel/qcoreapplication.cpp:1229
#25 0x00007ffff5831554 in QGuiApplication::exec ()
    at /home/user/work/qt/git/qtbase/src/gui/kernel/qguiapplication.cpp:1528
#26 0x00007ffff7148d73 in QApplication::exec ()
    at /home/user/work/qt/git/qtbase/src/widgets/kernel/qapplication.cpp:2977
#27 0x00000000004095fb in main ()