Unsolved QT Application crash with onboard virtual keyboard with non root users

[Julieta]

Hello!

We are running our application in Ubuntu 16.04. It crashes if the on*board keyboard is opened. The same application run by root works ok. We have created a small qml app with a combo box inside a popup. If combo model is empty, the app works ok.

Do you have any suggestions?

Thanks!

The segfault reported trace:
1 ??
2 QQuickItemLayer::~QQuickItemLayer() 0x7fffe6ab5448
3 QQuickItemLayer::~QQuickItemLayer() 0x7fffe6ab54b9
4 QAccessibleQuickItem::role() const 0x7fffe6c46832
5 AtSpiAdaptor::pathForInterface(QAccessibleInterface *) const 0x7fffef3d9171
6 AtSpiAdaptor::notifyStateChange(QAccessibleInterface *, QString const&, int) 0x7fffef3db9cf
7 AtSpiAdaptor::notify(QAccessibleEvent *) 0x7fffef3dcdfa
8 QQuickItemPrivate::setEffectiveVisibleRecur(bool) 0x7fffe6aba7bf
9 QQuickItem::setParentItem(QQuickItem *) 0x7fffe6ac718a
10 QQuickItem::~QQuickItem() 0x7fffe6ac7ef8
11 QQmlPrivate::QQmlElement<QQuickItemDelegate>::~QQmlElement() 0x7fffe4e5a85e
12 QObject::event(QEvent *) 0x7ffff69eeb98
13 QQuickItem::event(QEvent *) 0x7fffe6ac60fb
14 QCoreApplication::notifyInternal2(QObject *, QEvent *) 0x7ffff69c0ea8
15 QCoreApplicationPrivate::sendPostedEvents(QObject *, int, QThreadData *) 0x7ffff69c4437
16 postEventSourceDispatch(_GSource *, int ( *)(void *), void *) 0x7ffff6a19b53
17 g_main_context_dispatch 0x7ffff2576127
18 ?? 0x7ffff2576380
19 g_main_context_iteration 0x7ffff257642c
20 QEventDispatcherGlib::processEvents(QFlagsQEventLoop::ProcessEventsFlag) 0x7ffff6a1918f
... <More>

The example app qml code:

import QtQuick 2.12
import QtQuick.Controls 2.5
import QtQuick.Window 2.12

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Page {
        anchors.fill: parent

        Button {
            text:">"
            onClicked: pop.open()
        }
    }

    Popup {
        id:pop
        Column {

            ComboBox {
                id: cbo
                textRole: "name"
                model: ListModel {
                    ListElement {
                        name: "test1"
                    }
                    ListElement {
                        name: "test2"
                    }
                }

            }
            TextField {
                placeholderText: "writehere..."
            }

        }

    }

    }