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From: "leandro.lupori at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/109500] New: SIGABRT when calling a function that
 returns an unallocated value
Date: Thu, 13 Apr 2023 13:24:46 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 12.0
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X-Bugzilla-Who: leandro.lupori at linaro dot org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109500

            Bug ID: 109500
           Summary: SIGABRT when calling a function that returns an
                    unallocated value
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: leandro.lupori at linaro dot org
  Target Milestone: ---

While doing some tests with functions that return an allocatable result, I
found out that the following program receives a SIGABRT:

program main
  print *, is_allocated(f())

contains
  function f()
    integer, allocatable :: f
  end function

  logical function is_allocated(p)
    integer, allocatable :: p

    is_allocated =3D allocated(p)
  end function
end program

This is the output (without the backtrace):
free(): invalid pointer

Program received signal SIGABRT: Process abort signal.

I tested it with gfortran 11.3.0 and 12.0.0 20220117 (experimental) [master
r12-6624-gb75aab194e3] (from gcc-snapshot).

The program above is a reduced version. I was actually trying to use a func=
tion
that could return either an allocated result or an unallocated one, dependi=
ng
on the argument, such as:

function f(p)
  integer, allocatable :: f, p

  if (allocated(p)) then
    f =3D p
  endif
end function=