Created attachment 108620 [details] backtrace This crash happens on opensuse krypton, qt 5.10, under wayland.
What about under X11? https://github.com/KDE/kwidgetsaddons/blob/master/src/kmessagebox.cpp#L396
no crash under X11.
Crash is in QtWayland. Please report this issue directly to Qt developers via https://bugreports.qt.io/ Relevant part of the backtrace for duplication searches: #0 0x00007fffe23c0f35 in QtWaylandClient::QWaylandXdgSurfaceV6::setType(Qt::WindowType, QtWaylandClient::QWaylandWindow*) () from /usr/lib64/libQt5WaylandClient.so.5 #1 0x00007fffe23bcbbe in QtWaylandClient::QWaylandWindow::initWindow() () from /usr/lib64/libQt5WaylandClient.so.5 #2 0x00007fffe23bd1ca in QtWaylandClient::QWaylandWindow::setVisible(bool) () from /usr/lib64/libQt5WaylandClient.so.5 #3 0x00007fffd602ae64 in QtWaylandClient::QWaylandEglWindow::setVisible(bool) () from /usr/lib64/qt5/plugins/wayland-graphics-integration-client/libwayland-egl.so #4 0x00007ffff2eb2760 in QWindowPrivate::setVisible(bool) () from /usr/lib64/libQt5Gui.so.5 #5 0x00007ffff36d52a6 in QWidgetPrivate::show_sys() () from /usr/lib64/libQt5Widgets.so.5 #6 0x00007ffff36ddbf0 in QWidgetPrivate::show_helper() () from /usr/lib64/libQt5Widgets.so.5 #7 0x00007ffff36e0b4b in QWidget::setVisible(bool) () from /usr/lib64/libQt5Widgets.so.5 #8 0x00007ffff387e56c in QDialog::setVisible(bool) () from /usr/lib64/libQt5Widgets.so.5 #9 0x00007ffff387dca3 in QDialog::exec() () from /usr/lib64/libQt5Widgets.so.5
done https://bugreports.qt.io/browse/QTBUG-64380