Segmentation fault with mpiifort but works with mpif90

I have got into a rather peculiar situtation when running with mpi shared memory.

I am trying to measure bandwidth using shared memory in MPI and when running for different array sizes/bytes I am getting a segmentation fault when reaching 0.83886E+00 Mb of memory.

However, When running with `mpif90` (I am using the wrapper that comes with the Intel package installation in dir /intel/impi/to/bin- although it is MPI using the GNU Fortran) it works completely fine.

I can only thing of two things,

1) A intel bug

2) I have bug which the mpif90 does not catch, however, the intel MPI does.

I have tried to cut down the code as much as possible to keep it simple

The way I am doing MPI communication is between two codes, (test_sup1 and test_sup2), both in this case are almost identical. test_sup1 is the sender and test_sup2 is the receiver.  The only that differs really is the measure_bandwidth routine.

To compile and run I am using following command:

mpiifort -O0 test_sup2.f -o test2.a ; mpiifort -O0 test_sup1.f -o test1.a


mpirun -np 1 ./test1.a : -np 1 ./test2.a

Can anybody please help me to figure out what is wrong here