From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-435234-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 25610 invoked by alias); 20 Nov 2013 13:43:29 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 25475 invoked by uid 48); 20 Nov 2013 13:43:26 -0000
From: "Joost.VandeVondele at mat dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgomp/59194] tsan detects race for real variables in an OMP reduction clause
Date: Wed, 20 Nov 2013 13:43:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libgomp
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: Joost.VandeVondele at mat dot ethz.ch
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: <bug-59194-4-rFsM0aKJ3z@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-59194-4@http.gcc.gnu.org/bugzilla/>
References: <bug-59194-4@http.gcc.gnu.org/bugzilla/>
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/msg02011.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59194

--- Comment #3 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> ---
actually it seems more general an issue, the following:

SUBROUTINE S1(m)
  REAL  :: m
  !$OMP ATOMIC
  m=m+1.0
END

REAL :: m
m=0.0
!$OMP PARALLEL 
CALL S1(m)
!$OMP END PARALLEL
END

flags  race for the atomic update of m. Again, does work for integers but not
for reals.