Comment 2 for bug 1334203

(gdb) bt full
#0 0xa9ace1ea in QHash<UnityMenuAction*, _GtkSimpleActionObserver*>::findNode(UnityMenuAction* const&, unsigned int*) const ()
   from /usr/lib/arm-linux-gnueabihf/libqmenumodel.so.0
No symbol table info available.
#1 0xa9acc920 in UnityMenuModel::unregisterAction(UnityMenuAction*) ()
   from /usr/lib/arm-linux-gnueabihf/libqmenumodel.so.0
No symbol table info available.
#2 0xa9ac9a26 in UnityMenuAction::~UnityMenuAction() ()
   from /usr/lib/arm-linux-gnueabihf/libqmenumodel.so.0
No symbol table info available.
#3 0xa9ae80c2 in QQmlPrivate::QQmlElement<UnityMenuAction>::~QQmlElement() ()
   from /usr/lib/arm-linux-gnueabihf/qt5/qml/QMenuModel/libqmenumodel-qml.so
No symbol table info available.
#4 0xb6dcd6f2 in QObjectPrivate::deleteChildren (this=this@entry=0xa1101500)
    at kernel/qobject.cpp:1935
        i = 14
#5 0xb6dd2fce in QObject::~QObject (this=<optimized out>,
    __in_chrg=<optimized out>) at kernel/qobject.cpp:1028
        d = <optimized out>
        __PRETTY_FUNCTION__ = "virtual QObject::~QObject()"
#6 0xb67e54d4 in QQuickItem::~QQuickItem() ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#7 0xb67f0902 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
No symbol table info available.
Backtrace stopped: previous frame identical to this frame (corrupt stack?)