https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96041
--- Comment #5 from Bill Seurer <seurer at linux dot vnet.ibm.com> --- It hits that breakpoints many times and for the first many it was always 0. Then I just let it run until it ICEd and backed up the call stack a bit. Program received signal SIGSEGV, Segmentation fault. 0x00000000106dcbd4 in free_st_labels (label=0x981) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:2662 2662 free_st_labels (label->left); (gdb) where #0 0x00000000106dcbd4 in free_st_labels (label=0x981) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:2662 #1 0x00000000106dcbe0 in free_st_labels (label=0x13492760) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:2662 #2 0x00000000106dcbe0 in free_st_labels (label=0x3fffb7e50a58 <main_arena+88>) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:2662 #3 0x00000000106dff28 in gfc_free_namespace (ns=0x13495ae0) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:4050 #4 0x00000000106dda60 in gfc_free_symbol (sym=0x13493e40) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:3084 #5 0x00000000106ddc14 in gfc_release_symbol (sym=0x13493e40) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:3125 #6 0x00000000106dfa10 in free_sym_tree (sym_tree=0x13493e00) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:3902 #7 0x00000000106dfa00 in free_sym_tree (sym_tree=0x13493ac0) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:3900 #8 0x00000000106df9f0 in free_sym_tree (sym_tree=0x13493fa0) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:3899 #9 0x00000000106dfe90 in gfc_free_namespace (ns=0x1348f6b0) at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:4041 #10 0x00000000106e0144 in gfc_symbol_done_2 () at /home/seurer/gcc/git/gcc-test/gcc/fortran/symbol.c:4101 #11 0x000000001062536c in gfc_done_2 () at /home/seurer/gcc/git/gcc-test/gcc/fortran/misc.c:358 #12 0x000000001066cec8 in clean_up_modules (gsym=0x13490330) at /home/seurer/gcc/git/gcc-test/gcc/fortran/parse.c:6267 #13 0x000000001066d22c in translate_all_program_units (gfc_global_ns_list=0x13477bf0) at /home/seurer/gcc/git/gcc-test/gcc/fortran/parse.c:6330 #14 0x000000001066da84 in gfc_parse_file () at /home/seurer/gcc/git/gcc-test/gcc/fortran/parse.c:6546 #15 0x00000000106f0488 in gfc_be_parse_file () at /home/seurer/gcc/git/gcc-test/gcc/fortran/f95-lang.c:212 #16 0x0000000011248514 in compile_file () at /home/seurer/gcc/git/gcc-test/gcc/toplev.c:458 #17 0x000000001124d87c in do_compile () at /home/seurer/gcc/git/gcc-test/gcc/toplev.c:2307 #18 0x000000001124dda4 in toplev::main (this=0x3fffffffe910, argc=20, argv=0x3fffffffed78) at /home/seurer/gcc/git/gcc-test/gcc/toplev.c:2446 #19 0x00000000124facf4 in main (argc=20, argv=0x3fffffffed78) at /home/seurer/gcc/git/gcc-test/gcc/main.c:39 up a few times... 4050 free_st_labels (ns->st_labels); (gdb) print ns->st_labels $8 = (gfc_st_label *) 0x3fffb7e50a58 <main_arena+88>
