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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/93925] Invalid memory reference upon call of a routine
 taking a procedure pointer as argument
Date: Mon, 25 Jan 2021 20:04:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D93925

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tkoenig at gcc dot gnu.org
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
The test case violates, 15.5.2.4  Ordinary dummy variables, subsection 11
of the F2018 standard:

If the dummy argument has the TARGET attribute and the effective argument
does not have the TARGET attribute or is an array section with a vector
subscript, any pointers associated with the dummy argument
become undefined when execution of the procedure completes.

fun returns an undefined pointer, so anything can happen (including
a segfault).

nagfor catches this, by the way:

Runtime Error: 93925.f90, line 36: Reference to dangling pointer P
Target was RETURNed from procedure F=