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[Bug fortran/47204] New: [4.6 Regression] ICE: SIGSEGV in gfc_free_namespace (symbol.c:3323) on invalid code


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47204

           Summary: [4.6 Regression] ICE: SIGSEGV in gfc_free_namespace
                    (symbol.c:3323) on invalid code
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


----- testcase.f03 -----
    select type (a)
------------------------

Compiler output:
$ gfortran testcase.f03                                       
Error: Unexpected end of file in 'testcase.f03'
==8750== Invalid read of size 8
==8750==    at 0x590EC2: gfc_free_namespace (symbol.c:3304)
==8750==    by 0x5917EF: gfc_symbol_done_2 (symbol.c:3347)
==8750==    by 0x553588: gfc_done_2 (misc.c:294)
==8750==    by 0x55EC11: unexpected_eof (parse.c:1845)
==8750==    by 0x562F5C: parse_executable (parse.c:3101)
==8750==    by 0x5637C1: parse_progunit (parse.c:3939)
==8750==    by 0x5643DD: gfc_parse_file (parse.c:4348)
==8750==    by 0x59CB45: gfc_be_parse_file (f95-lang.c:250)
==8750==    by 0x93A477: toplev_main (toplev.c:579)
==8750==    by 0x6369BBC: (below main) (in /lib64/libc-2.11.2.so)
==8750==  Address 0x6f16bf0 is 0 bytes inside a block of size 2,552 free'd
==8750==    at 0x4C25E0D: free (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==8750==    by 0x550695: gfc_free_case_list (match.c:4361)
==8750==    by 0x58BE7C: gfc_free_statements (st.c:230)
==8750==    by 0x590EC1: gfc_free_namespace (symbol.c:3302)
==8750==    by 0x5917EF: gfc_symbol_done_2 (symbol.c:3347)
==8750==    by 0x553588: gfc_done_2 (misc.c:294)
==8750==    by 0x55EC11: unexpected_eof (parse.c:1845)
==8750==    by 0x562F5C: parse_executable (parse.c:3101)
==8750==    by 0x5637C1: parse_progunit (parse.c:3939)
==8750==    by 0x5643DD: gfc_parse_file (parse.c:4348)
==8750==    by 0x59CB45: gfc_be_parse_file (f95-lang.c:250)
==8750==    by 0x93A477: toplev_main (toplev.c:579)
==8750==    by 0x6369BBC: (below main) (in /lib64/libc-2.11.2.so)

(many invalid reads follow, final crash is caused by double free)

f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Tested revisions:
r168552 - crash
r165699 - crash
r161659 - crash
r158095 - OK
4.5 r168062 - OK


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