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From: "davidhneill at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98573] Dynamic type lost on assignment
Date: Wed, 06 Jan 2021 19:12:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98573

--- Comment #1 from David Neill Asanza <davidhneill at gmail dot com> ---
Removing the derived type container triggers a segfault.

$ cat segfault.f90

module foo
contains
  subroutine store1(arr, val)
    class(*), allocatable, intent(out) :: arr(:)
    class(*), intent(in) :: val(:)
    arr =3D val
  end subroutine store1
  subroutine store2(arr, val)
    class(*), allocatable, intent(out) :: arr(:)
    class(*), intent(in) :: val(:)
    allocate(arr, source=3Dval)
  end subroutine store2
end module foo

program prog
  use foo
  class(*), allocatable :: arr(:)
  call store1(arr, [1, 2, 3])  ! SEGFAULT
  call store2(arr, [1, 2, 3])  ! NO PROBLEM
end program


$ gfortran -g -Wall -Wextra minimal.f90
$ ./a.out

Program received signal SIGSEGV: Segmentation fault - invalid memory refere=
nce.=