askhl@askm:~/blacs$ mpirun -np 8 blacshello 
rank=0, subcontext=2
rank=2, subcontext=2
rank=4, subcontext=2
rank=6, subcontext=2
[askm:1937] *** An error occurred in MPI_Group_incl
[askm:1937] *** on communicator MPI_COMM_WORLD
[askm:1937] *** MPI_ERR_RANK: invalid rank
[askm:1937] *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)
--------------------------------------------------------------------------
mpirun has exited due to process rank 0 with PID 1937 on
node askm exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------
[askm:01936] 3 more processes have sent help message help-mpi-errors.txt / mpi_errors_are_fatal
[askm:01936] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages
askhl@askm:~/blacs$