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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/106916] New: ICE/segfault during parsing with modules
 and invalid code in gfc_free_namespace when using the same symbol twice
Date: Mon, 12 Sep 2022 17:51:30 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-invalid-code
X-Bugzilla-Severity: normal
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106916

            Bug ID: 106916
           Summary: ICE/segfault during parsing with modules and invalid
                    code in gfc_free_namespace when using the same symbol
                    twice
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
  Target Milestone: ---

f951: internal compiler error: in gfc_free_namespace, at fortran/symbol.cc:=
4039
0x686c77 gfc_free_namespace(gfc_namespace*&)
        ../../repos/gcc/gcc/fortran/symbol.cc:4039
0xa29daf gfc_free_symbol(gfc_symbol*&)
        ../../repos/gcc/gcc/fortran/symbol.cc:3085
0xa29e85 gfc_release_symbol(gfc_symbol*&)
        ../../repos/gcc/gcc/fortran/symbol.cc:3127

for the invalid attached testcase. -fopenmp is in theory required.

There are two issues:
  * The same symbol is used twice, once use associated and once newly defin=
ed
    in an interface block.
  * There is a tailing '::'


module omp_lib_target
  use omp_lib
  implicit none (type, external)

  interface
    logical function omp_target_is_present(ptr, device_num)
      type(*), dimension(..) ::=20
    end function omp_target_is_present
  end interface
end module omp_lib_target=