Allocating parametrized declared type that is within a parametrized declared type

I have the following code which gives me a catastrophic error without mentioning what the error is:

catastrophic error: Internal compiler error: segmentation violation signal raised Please report this error along with the circumstances in which it occurred in a Software Problem Report. Note: File and line given may not be explicit cause of this error.

However, I know what triggers this error, namely: allocate(gdad% ttt(tsize=10) :: gdad% test_type)

Anybody familiar with this 

  module t_test
     implicit none

     type ttt(tsize)
        integer, len :: tsize
        real x(tsize)
     end type ttt



  type :: t_rndom_diameter(t_rsize,t_csize)
      integer, len :: t_rsize,t_csize
      real :: x(t_rsize,t_csize)
     type(ttt(tsize=:)), allocatable :: test_type
  end type t_rndom_diameter


  end module t_test


  program p_test
  USE t_test
  implicit none

  type(t_rndom_diameter(t_rsize=3,t_csize=3)) :: gdad

  allocate(gdad% ttt(tsize=10) ::  gdad % test_type)


  end program

Thanks in advance