From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#36609: 27.0.50; Possible race-condition in threading implementation Date: Fri, 12 Jul 2019 15:42:20 +0300 Message-ID: <83muhj2zmb.fsf@gnu.org> References: <87muhks3b5.fsf@hochschule-trier.de> Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="49582"; mail-complaints-to="usenet@blaine.gmane.org" Cc: 36609@debbugs.gnu.org, politza@hochschule-trier.de To: Pip Cet Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Jul 12 14:43:08 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hlutI-000CmJ-6r for geb-bug-gnu-emacs@m.gmane.org; Fri, 12 Jul 2019 14:43:08 +0200 Original-Received: from localhost ([::1]:49114 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hlutH-0000zi-5B for geb-bug-gnu-emacs@m.gmane.org; Fri, 12 Jul 2019 08:43:07 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:41065) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hlutE-0000zO-3o for bug-gnu-emacs@gnu.org; Fri, 12 Jul 2019 08:43:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hlutD-0005lK-7V for bug-gnu-emacs@gnu.org; Fri, 12 Jul 2019 08:43:04 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:58766) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hlutD-0005ko-3s for bug-gnu-emacs@gnu.org; Fri, 12 Jul 2019 08:43:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1hlutC-00053k-Tx for bug-gnu-emacs@gnu.org; Fri, 12 Jul 2019 08:43:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 12 Jul 2019 12:43:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 36609 X-GNU-PR-Package: emacs Original-Received: via spool by 36609-submit@debbugs.gnu.org id=B36609.156293536719427 (code B ref 36609); Fri, 12 Jul 2019 12:43:02 +0000 Original-Received: (at 36609) by debbugs.gnu.org; 12 Jul 2019 12:42:47 +0000 Original-Received: from localhost ([127.0.0.1]:39354 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hlusu-00053E-Fa for submit@debbugs.gnu.org; Fri, 12 Jul 2019 08:42:46 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:56822) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hlusr-00052y-JQ for 36609@debbugs.gnu.org; Fri, 12 Jul 2019 08:42:42 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:39469) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hlusf-0004xT-NW; Fri, 12 Jul 2019 08:42:30 -0400 Original-Received: from [176.228.60.248] (port=1368 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1hluse-0005ZJ-9p; Fri, 12 Jul 2019 08:42:29 -0400 In-reply-to: (message from Pip Cet on Fri, 12 Jul 2019 09:02:22 +0000) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:162760 Archived-At: > From: Pip Cet > Date: Fri, 12 Jul 2019 09:02:22 +0000 > Cc: 36609@debbugs.gnu.org > > On Thu, Jul 11, 2019 at 8:52 PM Andreas Politz > wrote: > > I think there is a race-condition in the implementation of threads. I > > tried to find a minimal test-case, without success. Thus, I've attached > > a lengthy source-file. Loading that file should trigger this bug and > > may freeze your session. > > It does here, so I can provide further debugging information if > needed. Thanks, can you provide the info I asked for? > On first glance, it appears that xgselect returns abnormally with > g_main_context acquired in one thread, and then other threads fail > to acquire it and loop endlessly. If you can describe what causes this to happen, I think we might be half-way to a solution. > + ptrdiff_t count = SPECPDL_INDEX (); I don't think we should do that at this low level.