From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21544 invoked by alias); 20 Nov 2013 18:32:47 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 21484 invoked by uid 48); 20 Nov 2013 18:32:44 -0000 From: "kcc at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug sanitizer/59215] tsan: warning in shared_ptr_base.h Date: Wed, 20 Nov 2013 18:32:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: sanitizer X-Bugzilla-Version: 4.8.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: kcc at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-11/txt/msg02065.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59215 --- Comment #11 from Kostya Serebryany --- > _Atomic_word __count = _M_use_count; <==== the read Interesting. We haven't seen these (we don't use this implementation of shared_ptr). I think the code is simply wrong -- it should be using __atomic_load_n instead of plain loads. You can also suppress it for now (https://code.google.com/p/thread-sanitizer/wiki/Suppressions)