Application crash related to Loader on Android.
This was reported as a crash with Qt Quick Controls but we have narrowed it down to this use case:

import QtQuick 2.2
Loader {
    id: loader
    sourceComponent: QtObject {
        property Item control: loader
        property QtObject floatingObject: QtObject {
            property bool someBinding: control.enabled
        }
    }
}

The above pattern is heavily used for styling in Qt Quick Controls. This is also a regression against 5.1.1.