From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E219C46466 for ; Mon, 5 Oct 2020 15:53:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F61B20663 for ; Mon, 5 Oct 2020 15:53:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728723AbgJEPxL (ORCPT ); Mon, 5 Oct 2020 11:53:11 -0400 Received: from netrider.rowland.org ([192.131.102.5]:55405 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1726935AbgJEPxL (ORCPT ); Mon, 5 Oct 2020 11:53:11 -0400 Received: (qmail 381520 invoked by uid 1000); 5 Oct 2020 11:53:10 -0400 Date: Mon, 5 Oct 2020 11:53:10 -0400 From: Alan Stern To: Luc Maranget Cc: Akira Yokosawa , "Paul E. McKenney" , parri.andrea@gmail.com, will@kernel.org, peterz@infradead.org, boqun.feng@gmail.com, npiggin@gmail.com, dhowells@redhat.com, j.alglave@ucl.ac.uk, dlustig@nvidia.com, joel@joelfernandes.org, viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: Bug in herd7 [Was: Re: Litmus test for question from Al Viro] Message-ID: <20201005155310.GH376584@rowland.harvard.edu> References: <20201001045116.GA5014@paulmck-ThinkPad-P72> <20201001161529.GA251468@rowland.harvard.edu> <20201001213048.GF29330@paulmck-ThinkPad-P72> <20201003132212.GB318272@rowland.harvard.edu> <045c643f-6a70-dfdf-2b1e-f369a667f709@gmail.com> <20201003171338.GA323226@rowland.harvard.edu> <20201005151557.4bcxumreoekgwmsa@yquem.inria.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201005151557.4bcxumreoekgwmsa@yquem.inria.fr> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 05, 2020 at 05:15:57PM +0200, Luc Maranget wrote: > > On Sun, Oct 04, 2020 at 12:16:31AM +0900, Akira Yokosawa wrote: > > > > P1(int *x, int *y) > > > > { > > > > WRITE_ONCE(*x, READ_ONCE(*y)); > > > > > > Looks like this one-liner doesn't provide data-dependency of y -> x on herd7. > > > > You're right. This is definitely a bug in herd7. > > > > Luc, were you aware of this? > > Hi Alan, > > No I was not aware of it. Now I am, the bug is normally fixed in the master branch of herd git deposit. > > > Thanks for the report. I tested the new commit -- it does indeed fix the problem. Thanks. Alan