Comment 2 for bug 1617180

So looking at the Qt code, the QDBusPendingCallPrivate class is ref counted, where most references will be owned by a QDBusPendingCall instance (or a subclass). It has one additional reference that is managed manually in the QDBusConnectionPrivate code.

I suspect it is this last reference that is getting lost somewhere, but I've got no idea why I haven't noticed something similar in other pieces of code invoking asynchronous methods with QtDBus.