invalidating new handle

mpi/src/starpu_mpi_task_insert.c

@@ -877,7 +877,7 @@ void starpu_mpi_redux_data_prio_tree(MPI_Comm comm, starpu_data_handle_t data_ha
 				       	        starpu_mpi_irecv_detached_prio(new_handle, contributors[node], data_tag, prio, comm, NULL, NULL);
 					        /* Task B */
 				       		starpu_task_insert(data_handle->redux_cl, STARPU_RW|STARPU_COMMUTE, data_handle, STARPU_R, new_handle, 0);
-				
+						starpu_data_invalidate_submit(new_handle);
 					}
 				}
 			}