(gdb) bt
#0  0xb7fdd424 in __kernel_vsyscall ()
#1  0xb6da92ab in poll () from /lib/libc.so.6
#2  0xb5576fab in wl_display_dispatch_queue () from /lib/libwayland-client.so.0
#3  0xb55f27f5 in QWaylandDisplay::blockingReadEvents() () from /usr/lib/qt5/plugins/platforms/libqwayland-egl.so
#4  0xb55f4713 in QWaylandWindow::waitForFrameSync() () from /usr/lib/qt5/plugins/platforms/libqwayland-egl.so
#5  0xb55f1bd5 in QWaylandShmBackingStore::beginPaint(QRegion const&) () from /usr/lib/qt5/plugins/platforms/libqwayland-egl.so
#6  0xb76f7bb0 in QBackingStore::beginPaint(QRegion const&) () from /lib/libQt5Gui.so.5
#7  0xb7a6871e in QWidgetBackingStore::beginPaint(QRegion&, QWidget*, QBackingStore*, BeginPaintInfo*, bool) () from /lib/libQt5Widgets.so.5
#8  0xb7a6ad22 in QWidgetBackingStore::sync() () from /lib/libQt5Widgets.so.5
#9  0xb7a93cbc in QWidgetPrivate::syncBackingStore() () from /lib/libQt5Widgets.so.5
#10 0xb7aa5ccf in QWidget::event(QEvent*) () from /lib/libQt5Widgets.so.5
#11 0xb7b5b932 in QAbstractButton::event(QEvent*) () from /lib/libQt5Widgets.so.5
#12 0xb7c010dc in QPushButton::event(QEvent*) () from /lib/libQt5Widgets.so.5
#13 0xb7a5c0bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/libQt5Widgets.so.5
#14 0xb7a61ad5 in QApplication::notify(QObject*, QEvent*) () from /lib/libQt5Widgets.so.5
#15 0xb726273a in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib/libQt5Core.so.5
#16 0xb7a6c6ca in QWidgetBackingStore::markDirty(QRect const&, QWidget*, bool, bool) () from /lib/libQt5Widgets.so.5
#17 0xb7a944f5 in QWidget::repaint(QRect const&) () from /lib/libQt5Widgets.so.5
#18 0xb7a9454b in QWidget::repaint() () from /lib/libQt5Widgets.so.5
#19 0xb7b59afe in QAbstractButton::mousePressEvent(QMouseEvent*) () from /lib/libQt5Widgets.so.5
#20 0xb7aa572d in QWidget::event(QEvent*) () from /lib/libQt5Widgets.so.5
#21 0xb7b5b932 in QAbstractButton::event(QEvent*) () from /lib/libQt5Widgets.so.5
#22 0xb7c010dc in QPushButton::event(QEvent*) () from /lib/libQt5Widgets.so.5
#23 0xb7a5c0bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/libQt5Widgets.so.5
#24 0xb7a628dd in QApplication::notify(QObject*, QEvent*) () from /lib/libQt5Widgets.so.5
#25 0x0805400a in QTest::mouseEvent(QTest::MouseAction, QWidget*, Qt::MouseButton, QFlags<Qt::KeyboardModifier>, QPoint, int) ()
#26 0x08053c2a in QTest::mouseEvent(QTest::MouseAction, QWidget*, Qt::MouseButton, QFlags<Qt::KeyboardModifier>, QPoint, int) ()
#27 0x0805aa98 in tst_QMenu::pushButtonPopulateOnAboutToShow() ()
#28 0x0805c8f4 in tst_QMenu::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) ()
#29 0xb726de11 in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const () from /lib/libQt5Core.so.5
#30 0xb72738e8 in QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) () from /lib/libQt5Core.so.5
#31 0xb7936ff3 in QTest::qInvokeTestMethod(char const*, char const*) () from /lib/libQt5Test.so.5
#32 0xb7937b2f in QTest::qExec(QObject*, int, char**) () from /lib/libQt5Test.so.5
#33 0x0804f0cf in main ()