Refine the protection from cross-dvm communications

This commit was SVN r23615.

orte/mca/rmcast/base/rmcast_base_fns.c

@@ -241,16 +241,20 @@ void orte_rmcast_base_process_recv(orte_mcast_msg_event_t *msg)
      * it is on the system channel. We ignore these messages to avoid
      * confusion between different jobs since we all may be sharing
      * multicast channels. The system channel is left open to support
-     * cross-job communications via the HNP.
+     * cross-job communications for detecting multiple conflicting DVMs.
      */
     if (ORTE_JOB_FAMILY(name.jobid) != ORTE_JOB_FAMILY(ORTE_PROC_MY_NAME->jobid) &&
         (ORTE_RMCAST_SYS_CHANNEL != channel)) {
+        /* if we are not the HNP or a daemon, then we ignore this */
+        if (ORTE_PROC_IS_HNP || ORTE_PROC_IS_DAEMON) {
             OPAL_OUTPUT_VERBOSE((10, orte_rmcast_base.rmcast_output,
                                  "%s rmcast:base:process_recv from a different job family: %s",
                                  ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                                  ORTE_NAME_PRINT(&name)));
+        } else {
             goto cleanup;
         }
+    }
     
     /* unpack the iovec vs buf flag */
     n=1;