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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: Tue, 28 Jun 2022 05:48:57 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29286

--- Comment #16 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #15)
> Created attachment 14180 [details]
> Patch fixing all detected data races

[gdb/symtab] Fix some data races

Fix some data races reported by thread sanitizer.

When build with -fsanitize=3Dthread and gcc 12, passes testsuite with no
data races.

There are a few problems when testing:
- we have a heap-use-after-free in gdb.dwarf2/dw2-icc-opaque.exp, but
  that's a known issue, also triggers with -fsanitize-address.
  Reported at PR25723 comment 1.
- we run into timeouts in test-cases gdb.gdb/python-helper.exp and
  gdb.threads/detach-step-over.exp, presumably due to sanitizer overhead.
- with all tui test, at the point of calling newterm we run into
  "WARNING: ThreadSanitizer: unlock of an unlocked mutex (or by a wrong
  thread)".  This also happens when first setting "maint set worker-threads
  0", so this doesn't seem to be related to gdb's multi-threading behaviour.

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