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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/99169] [9/10/11 Regression] Segfault when passing
 allocatable scalar into intent(out) dummy argument
Date: Fri, 19 Feb 2021 19:49:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99169

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |8.4.1
           Priority|P3                          |P4
            Summary|Segfault when passing       |[9/10/11 Regression]
                   |allocatable scalar into     |Segfault when passing
                   |intent(out) dummy argument  |allocatable scalar into
                   |                            |intent(out) dummy argument
     Ever confirmed|0                           |1
   Target Milestone|---                         |9.4
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |10.2.1, 11.0, 9.3.1
   Last reconfirmed|                            |2021-02-19
                 CC|                            |anlauf at gcc dot gnu.org

--- Comment #1 from anlauf at gcc dot gnu.org ---
Confirmed.

The tree dump shows that since at least 9.3.1 we clobber the pointer:

  integer(kind=3D4) * i;
...
      i =3D (integer(kind=3D4) *) __builtin_malloc (4);
...
  i =3D {CLOBBER};
  set_i (i);=