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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/29286] SUMMARY: ThreadSanitizer: data race
 gdb/dwarf2/read.c:4100 in dw_expand_symtabs_matching_file_matcher
Date: Sat, 25 Jun 2022 11:29:42 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29286

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 14169
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14169&action=3Ded=
it
gdb.log (bitfields eliminated in dwarf2_per_cu_data)

After making all the bitfields in the struct proper fields, we run into a
different problem.

We have a race between prepare_one_comp_unit gdb/dwarf2/read.c:23527:
...
    cu->per_cu->lang =3D dwarf_lang_to_enum_language (attr->constant_value =
(0));
...
and :
...
cooked_index::do_finalize gdb/dwarf2/cooked-index.c:199:
...
      if ((entry->per_cu->lang !=3D language_cplus
           && entry->per_cu->lang !=3D language_ada)
          || (entry->flags & IS_LINKAGE) !=3D 0)
...

Hmm, AFAIU, building with 0 worker threads would guarantee this order, so t=
he
entry->per_cu->lang will then always be unknown when tested in cooked-index?

--=20
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