[Bug fortran/58813] New: SIGSEGV in show_locus at error.c:310

["zeccav at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58813

            Bug ID: 58813
           Summary: SIGSEGV in show_locus at error.c:310
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zeccav at gmail dot com

! SIGSEGV in show_locus at error.c:310
! must be compiled as free form
! if seen as fixed format no SIGSEGV
! valgrind and sanitizer say invalid read at symbol.c:5001 "dummies =
sym->formal;" 
! sym already freed at symbol.c:2519? In gfc_free_symbol "free (sym);"
! linked to bug 56674?
      MODULE m
      PUBLIC t
      CONTAINS
      SUBROUTINE s
       TYPE(t)
      END SUBROUTINE
      END MODULE
!f951: internal compiler error: Segmentation fault
!0x869b1f crash_signal
!        ../../gcc-4.8.2/gcc/toplev.c:332
!0x50b1eb show_locus
!        ../../gcc-4.8.2/gcc/fortran/error.c:310
!0x50ba80 show_loci
!        ../../gcc-4.8.2/gcc/fortran/error.c:434
!0x50ba80 error_print
!        ../../gcc-4.8.2/gcc/fortran/error.c:666
!0x50c568 gfc_error(char const*, ...)
!        ../../gcc-4.8.2/gcc/fortran/error.c:961
!0x5142e7 check_interface0
!        ../../gcc-4.8.2/gcc/fortran/interface.c:1477
!0x516bc4 check_sym_interfaces
!        ../../gcc-4.8.2/gcc/fortran/interface.c:1589
!0x57e493 do_traverse_symtree
!        ../../gcc-4.8.2/gcc/fortran/symbol.c:3575
!0x516cac gfc_check_interfaces(gfc_namespace*)
!        ../../gcc-4.8.2/gcc/fortran/interface.c:1699
!0x55d31e resolve_types
!        ../../gcc-4.8.2/gcc/fortran/resolve.c:14989
!0x55dba0 gfc_resolve
!        ../../gcc-4.8.2/gcc/fortran/resolve.c:15073
!0x552286 gfc_parse_file()
!        ../../gcc-4.8.2/gcc/fortran/parse.c:4614
!0x58e195 gfc_be_parse_file
!        ../../gcc-4.8.2/gcc/fortran/f95-lang.c:189
!Please submit a full bug report,
!with preprocessed source if appropriate.
!Please include the complete backtrace with any bug report.