PacketSink needs something like this in StopApplication():
 {
   if (m_socket) 
     {
+      m_socket->Close ();
       m_socket->SetRecvCallback (MakeNullCallback<void, Ptr<Socket> > ());
     }
 }


However, this will not change any output because, for TCP, Close() is not supported properly right now, so I don't think this is a P1 bug for 3.1.