From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.bugs Subject: bug#36609: 27.0.50; Possible race-condition in threading implementation Date: Thu, 10 Jun 2021 17:35:54 +0200 Message-ID: <8735tpivfp.fsf@igel.home> References: <87muhks3b5.fsf@hochschule-trier.de> <87fsxv8182.fsf@dick> <83wnr7gdd8.fsf@gnu.org> <875yyqg66k.fsf@dick> <83k0n6hjym.fsf@gnu.org> <87wnr2lnsj.fsf@dick> <83h7i6cj3z.fsf@gnu.org> <87bl8e2aya.fsf@dick> <8335tpdcq9.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="15832"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) Cc: dick.r.chiang@gmail.com, 36609@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jun 10 17:36:11 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lrMj4-0003pi-Jy for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 10 Jun 2021 17:36:10 +0200 Original-Received: from localhost ([::1]:56482 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lrMj3-0005T1-G8 for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 10 Jun 2021 11:36:09 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56146) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lrMiw-0005Nz-CG for bug-gnu-emacs@gnu.org; Thu, 10 Jun 2021 11:36:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:54278) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lrMiw-00087T-3O for bug-gnu-emacs@gnu.org; Thu, 10 Jun 2021 11:36:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lrMiw-0003vD-0P for bug-gnu-emacs@gnu.org; Thu, 10 Jun 2021 11:36:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Andreas Schwab Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 10 Jun 2021 15:36:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 36609 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: fixed Original-Received: via spool by 36609-submit@debbugs.gnu.org id=B36609.162333935915067 (code B ref 36609); Thu, 10 Jun 2021 15:36:01 +0000 Original-Received: (at 36609) by debbugs.gnu.org; 10 Jun 2021 15:35:59 +0000 Original-Received: from localhost ([127.0.0.1]:37591 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lrMit-0003ux-Gs for submit@debbugs.gnu.org; Thu, 10 Jun 2021 11:35:59 -0400 Original-Received: from mail-out.m-online.net ([212.18.0.10]:57284) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lrMiq-0003uo-Qi for 36609@debbugs.gnu.org; Thu, 10 Jun 2021 11:35:57 -0400 Original-Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4G17NW5X6Yz1s46H; Thu, 10 Jun 2021 17:35:55 +0200 (CEST) Original-Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 4G17NW3Ghlz1qr42; Thu, 10 Jun 2021 17:35:55 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id flt8JSJX9wEm; Thu, 10 Jun 2021 17:35:54 +0200 (CEST) X-Auth-Info: h7NT1Kua0AHy7vYjmAiEIflybecsFG48Bt5VLZNdSU6eZmFFtL4T+4MNmFAbVPdl Original-Received: from igel.home (ppp-46-244-161-203.dynamic.mnet-online.de [46.244.161.203]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Thu, 10 Jun 2021 17:35:54 +0200 (CEST) Original-Received: by igel.home (Postfix, from userid 1000) id 4B7372C36A1; Thu, 10 Jun 2021 17:35:54 +0200 (CEST) X-Yow: Once, there was NO fun... This was before MENU planning, FASHION statements or NAUTILUS equipment... Then, in 1985.. FUN was completely encoded in this tiny MICROCHIP.. It contain 14,768 vaguely amusing SIT-COM pilots!! We had to wait FOUR BILLION years but we finally got JERRY LEWIS, MTV and a large selection of cream-filled snack cakes! In-Reply-To: <8335tpdcq9.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 10 Jun 2021 17:18:54 +0300") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:208328 Archived-At: On Jun 10 2021, Eli Zaretskii wrote: > The idea is that a variable that is modified in a single machine > instruction will always have the value assigned by the last thread > which set that. You cannot have that without explicit atomic operations. An ordinary RMW access is never atomic across cpus. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."