Crash in MPI_COMM_SPAWN_MULTIPLE

[Mark_C_]

I trying to manually spawn MPI processes. This code works fine when compiled with gfortran and linked against the OpenMPI libraries but when I compile it using ifort and the Intel MPI libraries, it results in an internal crash within the MPI_COMM_SPAWN_MULTIPLE subroutine. The relevant code is

         ALLOCATE(commands(num_processes - 1))
         ALLOCATE(args(num_processes - 1,2))
         ALLOCATE(info(num_processes - 1))
         ALLOCATE(max_procs(num_processes - 1))
         ALLOCATE(error_array(num_processes - 1))

         commands = TRIM(context%cl_parser%command)

         args(:,1) = temp_string
         IF (num_threads .lt. 0) THEN
            args(:,2) = '-para=-1'
         ELSE IF (num_threads .lt. 10) THEN
            WRITE (temp_string, 1001) num_threads
            args(:,2) = TRIM(temp_string)
         ELSE
            WRITE (temp_string, 1002) num_threads
            args(:,2) = TRIM(temp_string)
         END IF

         max_procs = 1

         DO i = 2, num_processes
            CALL MPI_INFO_CREATE(info(i - 1), error)
            CALL MPI_INFO_SET(info(i - 1), "wdir", process_dir(i),             &
     &                        error)
         END DO

         CALL MPI_COMM_SPAWN_MULTIPLE(num_processes - 1, commands, args,       &
     &                                max_procs, info, 0,                      &
     &                                MPI_COMM_WORLD, child_comm,              &
     &                                error_array, error)

         CALL MPI_INTERCOMM_MERGE(child_comm, .false.,                         &
     &                            context%intra_comm, error)

         DO i = 1, num_processes - 1
            CALL MPI_INFO_FREE(info(i), error)
         END DO

         DEALLOCATE(info)
         DEALLOCATE(max_procs)
         DEALLOCATE(args)
         DEALLOCATE(commands)
         DEALLOCATE(error_array)

When run this results in a segmentation fault internal to MPI_COMM_SPAWN_MULTIPLE. With the following error

Program received signal SIGSEGV, Segmentation fault.
0x00002aaaaadeb304 in pmpi_comm_spawn_multiple__ () from /usr/local/intel/impi/3.2.0.011/lib64/libmpiif.so.3.2

Is there something that I'm doing wrong here to cause this?