From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7604 invoked by alias); 4 Jan 2010 08:02:43 -0000 Received: (qmail 3652 invoked by uid 48); 4 Jan 2010 08:02:32 -0000 Date: Mon, 04 Jan 2010 08:02:00 -0000 Message-ID: <20100104080232.3649.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug libgomp/42602] libgomp.fortran/recursion1.f90 aborted at random In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "jakub at gcc dot gnu dot org" 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 X-SW-Source: 2010-01/txt/msg00357.txt.bz2 ------- Comment #1 from jakub at gcc dot gnu dot org 2010-01-04 08:02 ------- There is no such guarantee, the testcase contains data race. It can increment a shared variable in multiple threads using non-atomic instructions. One fix would be to use !$omp atomic s = s + n instead of just s = s + n Or put s = s + n into !$omp single, or use some other kind of locking. -- jakub at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|0000-00-00 00:00:00 |2010-01-04 08:02:31 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42602