Fortran strange segmentation fault - fortran

Question

I have some a problem with my main code, so I tried to isolate the problem.
Therefore, I have this small code :
MODULE Param
IMPLICIT NONE
integer, parameter :: dr = SELECTED_REAL_KIND(15, 307)
integer :: D =3
integer :: Q=10
integer :: mmo=16
integer :: n=2
integer :: x=80
integer :: y=70
integer :: z=20
integer :: tMax=8
END MODULE Param
module m
contains
subroutine compute(f, r)
USE Param, ONLY: dr, mmo, x, y, z, n
IMPLICIT NONE
real (kind=dr), intent(in) :: f(x,y,z, 0:mmo, n)
real (kind=dr), intent(out) :: r(x, y, z, n)
real (kind=dr) :: fGlob(x,y,z, 0:mmo)
!-------------------------------------------------------------------------
print*, 'We are in compute subroutine'
r= 00.0
fGlob=sum(f,dim=5)
r=sum(f, dim=4)
print*, 'fGlob=', fGlob(1,1,1, 1)
print*, 'f=', f(1,1,1, 0,1)
print*, 'r=', r(1,1,1, 1)
end subroutine compute
end module m
PROGRAM test_prog
USE Param
USE m
Implicit None
integer :: tStep
real (kind=dr), dimension(:,:,:, :,:), allocatable :: f
real (kind=dr), dimension(:,:,:,:), allocatable :: r
!----------------------------------------------------------------------------
! Initialise the parameters.
print*, 'beginning of the test'
! Allocate
allocate(f(x,y,z, 0:mmo,n))
allocate(r(x,y,z, n))
f=1.0_dr
! ---------------------------------------------------------
! Iteration over time
! ---------------------------------------------------------
do tStep = 1, tMax
print *, tStep
call compute(f,r)
f=f+1
print *, 'tStep', tStep
enddo
print*, 'f=', f(1,1,1, 0,1)
print*, 'r=', r(1,1,1, 1)
! Deallacation
deallocate(f)
deallocate(r)
print*, 'End of the test program'
END PROGRAM test_prog
For now, I am not able to understand why when I compile with ifort, I have a segmentation fault, and it works when I compile with gfortran. And worst, when I compile with both ifort and gfortran with their fast options, I get again a segmentation fault (core dumped) error. And more confusing, when I also tried with both compilers to compile with traceback options, everything works fine.
I know that segmentation fault (core dumped) error usually means that I try to read or write in a wrong location (matrix indices etc...); but here with this small code, I see no mistake like this.
Does anyone can help me to understand why theses errors occur?

Answer 1

The problem comes from the size of the stack used by some compilers by default (ifort) or by some others when they optimise the compilation (gfortran -Ofast). Here, our writings exceed the size of the stack.
To solve this, I use the options -heap-arrays for ifort compiler and -fno-stack-arrays for gfortran compiler.