From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id DDE5838582AB; Sun, 26 Jun 2022 13:36:32 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DDE5838582AB
From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29286] SUMMARY: ThreadSanitizer: data race
 gdb/dwarf2/read.c:4100 in dw_expand_symtabs_matching_file_matcher
Date: Sun, 26 Jun 2022 13:36:32 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: HEAD
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: vries at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: attachments.created
Message-ID: <bug-29286-4717-Krq0xwKROx@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-29286-4717@http.sourceware.org/bugzilla/>
References: <bug-29286-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gdb-prs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gdb-prs mailing list <gdb-prs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/gdb-prs/>
List-Help: <mailto:gdb-prs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Sun, 26 Jun 2022 13:36:33 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D29286

--- Comment #14 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 14175
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14175&action=3Ded=
it
gdb.log (gdb.dwarf2/dwz.exp)

AFAIU, the test-case contains (PU: Partial unit, CU: Compilation Unit):
- PU A
- CU B
- CU C importing PU A

A parallel for is called, which starts calling process_psymtab_comp_unit in
threads for A, B and C in parallel.

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 for=
 PU
A, which calls cutu_reader::cutu_reader for PU A.

In thread T3, PU A is handled, and cutu_reader::cutu_reader is called for P=
U A.

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 ou=
t.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=