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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: Thu, 14 Jul 2022 07:10:10 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29286

--- Comment #21 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #14)
> Created attachment 14175 [details]
> gdb.log (gdb.dwarf2/dwz.exp)
>=20
> AFAIU, the test-case contains (PU: Partial unit, CU: Compilation Unit):
> - PU A
> - CU B
> - CU C importing PU A
>=20
> A parallel for is called, which starts calling process_psymtab_comp_unit =
in
> threads for A, B and C in parallel.
>=20
> In the main thread, CU C is handled, the import is encountered,
> cooked_indexer::index_imported_unit is called, then
> cooked_indexer::ensure_cu_exists, which calls process_psymtab_comp_unit f=
or
> PU A, which calls cutu_reader::cutu_reader for PU A.
>=20
> In thread T3, PU A is handled, and cutu_reader::cutu_reader is called for=
 PU
> A.
>=20
> The thread sanitizer then detects that we're trying to read/write
> this_cu->dwarf_version in the same PU from different threads, and errors =
out.

https://sourceware.org/git/?p=3Dbinutils-gdb.git;a=3Dcommit;h=3D33fd0a33639=
897e1c3403389de882cadd344a494

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