[Bug c++/98624] New: UBSAN: gcc/cp/module.cc:5895:29: runtime error: member call on null pointer of type 'struct module_state'

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98624

            Bug ID: 98624
           Summary: UBSAN: gcc/cp/module.cc:5895:29: runtime error: member
                    call on null pointer of type 'struct module_state'
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: nathan at gcc dot gnu.org
            Blocks: 63426
  Target Milestone: ---

Seen with UBSAN compiler:

$ ./xg++ -B.
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/modules/align-type-1_a.C -c
-fmodules-ts
/home/marxin/Programming/gcc2/gcc/cp/module.cc:5895:29: runtime error: member
call on null pointer of type 'struct module_state'
    #0 0xf56fc4 in trees_out::core_vals(tree_node*)
/home/marxin/Programming/gcc2/gcc/cp/module.cc:5895
    #1 0xf67347 in trees_out::tree_node_vals(tree_node*)
/home/marxin/Programming/gcc2/gcc/cp/module.cc:7141
    #2 0xf6cd92 in trees_out::decl_value(tree_node*, depset*)
/home/marxin/Programming/gcc2/gcc/cp/module.cc:7753
    #3 0xfb2a97 in depset::hash::find_dependencies()
/home/marxin/Programming/gcc2/gcc/cp/module.cc:13199
    #4 0xfd1f35 in module_state::write(elf_out*, cpp_reader*)
/home/marxin/Programming/gcc2/gcc/cp/module.cc:17568
    #5 0xfe1ab8 in finish_module_processing(cpp_reader*)
/home/marxin/Programming/gcc2/gcc/cp/module.cc:19747
    #6 0xdcc2d1 in c_parse_final_cleanups()
/home/marxin/Programming/gcc2/gcc/cp/decl2.c:5178
    #7 0x15ae87f in c_common_parse_file()
/home/marxin/Programming/gcc2/gcc/c-family/c-opts.c:1233
    #8 0x2ccb435 in compile_file /home/marxin/Programming/gcc2/gcc/toplev.c:457
    #9 0x2cd3e17 in do_compile /home/marxin/Programming/gcc2/gcc/toplev.c:2193
    #10 0x2cd441a in toplev::main(int, char**)
/home/marxin/Programming/gcc2/gcc/toplev.c:2332
    #11 0x59b3bff in main /home/marxin/Programming/gcc2/gcc/main.c:39
    #12 0x7ffff6ce5151 in __libc_start_main (/lib64/libc.so.6+0x28151)
    #13 0xa82bdd in _start
(/home/marxin/Programming/gcc2/objdir/gcc/cc1plus+0xa82bdd)


Referenced Bugs:

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