I have two deferred length character arrays in gfortran.  I allocate one of them, and then point the other one to it.  The pointer variable has the correct array size, but not the correct character length.  The program terminates with an error when trying to access the information in the pointer.

I see that there may be related bugs that have been fixed (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51976), but this one is present now in version 8.

I'm testing this with:
GNU Fortran (MacPorts gcc8 8.2.0_2) 8.2.0

and also
GNU Fortran (MacPorts gcc8 8.2.0_3) 8.2.0


The code below works fine with Intel Fortran on Windows.

    program test
      implicit none
      character(len=:), pointer, dimension(:) :: charvara
      character(len=:), pointer, dimension(:) :: charvara_ptr
      
      allocate(character(len=10) :: charvara(3))
      charvara(:) = '0123456789'
      print *, 'len(charvara) = ', len(charvara)
      print *, 'size(charvara) = ', size(charvara)
      print *, 'charvara = ', charvara
      
      charvara_ptr => charvara
      print *, 'associated = ', associated(charvara_ptr, charvara)
      print *, 'len(charvara_ptr) = ', len(charvara_ptr)
      print *, 'size(charvara_ptr) = ', size(charvara_ptr)
      print *, 'charvara_ptr = ', charvara_ptr
      
      print *, 'end'
     
    end program test

I would expect the length, size, and contents of charvara_ptr to be the same as charvara, but instead I get the following:

     len(charvara) =           10
     size(charvara) =            3
     charvara = 012345678901234567890123456789
     associated =  T
     len(charvara_ptr) =   1708412736
     size(charvara_ptr) =            3
    test(71321,0x7fff9e47c380) malloc: *** mach_vm_map(size=140734901800960) failed (error code=3)
    *** error: can't allocate region
    *** set a breakpoint in malloc_error_break to debug
    Operating system error: Cannot allocate memory
    Memory allocation failure in xrealloc
    
    Error termination. Backtrace:
    #0  0x10bb11f8f
    #1  0x10bb127fd
    #2  0x10bb12987
    #3  0x10bb119f9
    #4  0x10bbc8950
    #5  0x10bbbf147
    #6  0x10bbc4b61
    #7  0x10bbc7cd8
    #8  0x10bbc877e
    #9  0x10bb0ccab
    #10  0x10bb0cd6e