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From: "antoine.lemoine@bordeaux-inp.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/95743] New: [9/10 Regression] bogus recursive call to
 nonrecursive procedure with -fcheck=recursion
Date: Thu, 18 Jun 2020 13:54:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95743

            Bug ID: 95743
           Summary: [9/10 Regression] bogus recursive call to nonrecursive
                    procedure with -fcheck=3Drecursion
           Product: gcc
           Version: 9.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoine.lemoine@bordeaux-inp.fr
  Target Milestone: ---

I was able to reproduce the closed bug #80361 with gfortran 9.3.0 and 10.1.0
using the following code:

program test_recursive_call=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20
   implicit none

   type t_tree_node
      type(t_tree_node), dimension(:), allocatable :: child
   end type

   type t_tree
      type(t_tree_node), allocatable :: root
   end type

   type(t_tree), allocatable :: tree

   allocate(tree)
   allocate(tree%root)
   allocate(tree%root%child(1))
   ! If the line below is removed, the code works fine.=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
   allocate(tree%root%child(1)%child(1))
   deallocate(tree)
end program

Command line to compile the code:
gfortran -g -fcheck=3Drecursion -o tree tree.f90

I obtain the following runtime error:

At line 1 of file tree.f90
Fortran runtime error: Recursive call to nonrecursive procedure
'__deallocate_test_recursive_call_T_tree_node'

Error termination. Backtrace:
#0  0x5623824511fb in __deallocate_test_recursive_call_T_tree_node
        at /home/****/fortran/test_gcc_ice2/tree.f90:1
#1  0x562382451302 in __deallocate_test_recursive_call_T_tree_node
        at /home/****/fortran/test_gcc_ice2/tree.f90:1
#2  0x562382451b95 in test_recursive_call
        at /home/****/fortran/test_gcc_ice2/tree.f90:18
#3  0x562382452230 in main
        at /home/****/fortran/test_gcc_ice2/tree.f90:19

It works fine without -fcheck=3Drecursion.=