Index: mpid/ch_p4/p4/lib/p4_bm.c =================================================================== RCS file: /MPIhome/mpich/mpid/ch_p4/p4/lib/p4_bm.c,v retrieving revision 1.15 diff -r1.15 p4_bm.c 515a516 > listener_info->slave_pid[0] = getppid(); Index: mpid/ch_p4/p4/lib/p4_sock_cr.c =================================================================== RCS file: /MPIhome/mpich/mpid/ch_p4/p4/lib/p4_sock_cr.c,v retrieving revision 1.17 retrieving revision 1.18 diff -r1.17 -r1.18 343c343 < snprintf (port_str, 5, "%d", serv_port); --- > snprintf (port_str, 6, "%d", serv_port); .