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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/103230] New: ipa-modref-tree.h:550:33: runtime error: load
 of value 255, which is not a valid value for type 'bool'
Date: Sun, 14 Nov 2021 08:55:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103230

            Bug ID: 103230
           Summary: ipa-modref-tree.h:550:33: runtime error: load of value
                    255, which is not a valid value for type 'bool'
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org, marxin at gcc dot gnu.org
            Blocks: 63426
  Target Milestone: ---

Happens with UBSAN compiler for:

$ gcc gcc/testsuite/gcc.c-torture/execute/pr71494.c -O1  -flto
...
/home/marxin/Programming/gcc/gcc/ipa-modref-tree.h:550:33: runtime error: l=
oad
of value 255, which is not a valid value for type 'bool'
    #0 0x18acc38 in modref_tree<tree_node*>::merge(modref_tree<tree_node*>*,
vec<modref_parm_map, va_heap, vl_ptr>*, modref_parm_map*, bool)
/home/marxin/Programming/gcc/gcc/ipa-modref-tree.h:550
    #1 0x188452c in modref_propagate_in_scc
/home/marxin/Programming/gcc/gcc/ipa-modref.c:4385
    #2 0x188a2b7 in execute /home/marxin/Programming/gcc/gcc/ipa-modref.c:4=
932
    #3 0x1f513bc in execute_one_pass(opt_pass*)
/home/marxin/Programming/gcc/gcc/passes.c:2567
    #4 0x1f54a44 in execute_ipa_pass_list(opt_pass*)
/home/marxin/Programming/gcc/gcc/passes.c:2996
    #5 0xb3bd3c in do_whole_program_analysis
/home/marxin/Programming/gcc/gcc/lto/lto.c:469
    #6 0xb3c538 in lto_main() /home/marxin/Programming/gcc/gcc/lto/lto.c:637
    #7 0x2417b3b in compile_file /home/marxin/Programming/gcc/gcc/toplev.c:=
452
    #8 0x2422188 in do_compile /home/marxin/Programming/gcc/gcc/toplev.c:21=
56
    #9 0x2422c03 in toplev::main(int, char**)
/home/marxin/Programming/gcc/gcc/toplev.c:2308
    #10 0x6edfd90 in main /home/marxin/Programming/gcc/gcc/main.c:39
    #11 0x7ffff6f1453f in __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
    #12 0x7ffff6f145eb in __libc_start_main_impl ../csu/libc-start.c:409
    #13 0xaa3b74 in _start (/dev/shm/objdir2/gcc/lto1+0xaa3b74)


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=3Dundefined=