From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mathieu Othacehe Newsgroups: gmane.lisp.guile.bugs Subject: bug#52646: GC thread freeze Date: Wed, 22 Dec 2021 10:15:06 +0100 Message-ID: <87y24dngpx.fsf@gnu.org> References: <878rwhbppt.fsf@gnu.org> <87wnjy6z5n.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30339"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) Cc: 52646@debbugs.gnu.org To: Ludovic =?UTF-8?Q?Court=C3=A8s?= Original-X-From: bug-guile-bounces+guile-bugs=m.gmane-mx.org@gnu.org Wed Dec 22 10:16:28 2021 Return-path: Envelope-to: guile-bugs@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 1mzxjX-0007cT-Uz for guile-bugs@m.gmane-mx.org; Wed, 22 Dec 2021 10:16:28 +0100 Original-Received: from localhost ([::1]:56072 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mzxjW-0007Pr-M4 for guile-bugs@m.gmane-mx.org; Wed, 22 Dec 2021 04:16:26 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:42744) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mzxjO-0007Pj-Pg for bug-guile@gnu.org; Wed, 22 Dec 2021 04:16:18 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:45239) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mzxj8-0008VJ-1c for bug-guile@gnu.org; Wed, 22 Dec 2021 04:16:14 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mzxj7-0005Xv-QZ for bug-guile@gnu.org; Wed, 22 Dec 2021 04:16:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Mathieu Othacehe Original-Sender: "Debbugs-submit" Resent-CC: bug-guile@gnu.org Resent-Date: Wed, 22 Dec 2021 09:16:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 52646 X-GNU-PR-Package: guile Original-Received: via spool by 52646-submit@debbugs.gnu.org id=B52646.164016451621253 (code B ref 52646); Wed, 22 Dec 2021 09:16:01 +0000 Original-Received: (at 52646) by debbugs.gnu.org; 22 Dec 2021 09:15:16 +0000 Original-Received: from localhost ([127.0.0.1]:56785 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mzxiN-0005Wj-Ut for submit@debbugs.gnu.org; Wed, 22 Dec 2021 04:15:16 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:41870) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mzxiM-0005WQ-Bt for 52646@debbugs.gnu.org; Wed, 22 Dec 2021 04:15:14 -0500 Original-Received: from [2001:470:142:3::e] (port=58968 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mzxiH-0008Lm-4V; Wed, 22 Dec 2021 04:15:09 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:In-Reply-To:Date:References:Subject:To: From; bh=QnBLHyh904PeNTyS6PmeonzHZQPMXORMGZ0An8JX970=; b=DQyHMvE2ZnvAFiHRm+t8 e+NY4eyiN10FifN3OT0m+CofLvxi+QBxQ9YcrAVT1FafElS+u2Hh94QhA359h/oTBXP3KELvV/WWs 0UAdy/X1qOMY6ZJu2Ncrw89zh2AyeFXlO2uY5nka8DpP3uid/bn+DS2GQdGU7FJccVYoYWecCe1Ik rMZH3vKsEVNH8VgyHDtvPIGoiktOefz+rWSvR+xX7ZHIZr2jx3cy4c4loT8qHRqLRqH49/6lPN5uu S7nGdWXj3KgSqampsJpym+5CG5x9tQUBEIdAP/FnOtncs+/rl4DQYFAfrh4t9Z/fAlOIHGwHlm0kA kvkC/EaOzME4rg==; Original-Received: from [2a01:cb18:832e:5f00:3563:417e:2a38:86d8] (port=49250 helo=meije) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mzxiG-0007n1-Gy; Wed, 22 Dec 2021 04:15:09 -0500 In-Reply-To: <87wnjy6z5n.fsf@gnu.org> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'s message of "Tue, 21 Dec 2021 11:16:36 +0100") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-guile@gnu.org List-Id: "Bug reports for GUILE, GNU's Ubiquitous Extension Language" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guile-bounces+guile-bugs=m.gmane-mx.org@gnu.org Original-Sender: "bug-guile" Xref: news.gmane.io gmane.lisp.guile.bugs:10227 Archived-At: Hey! > This is happening in this order, right? Right, plus I don't see the following warning: --8<---------------cut here---------------start------------->8--- warning: call to primitive-fork while multiple threads are running; further behavior unspecified. See "Processes" in the manual, for more information --8<---------------cut here---------------end--------------->8--- so I guess the issue is elsewhere. > POSIX leaves unspecified the behavior of a child process forked from a > multi-threaded process; there could be deadlocks, etc. =E2=80=98primitiv= e-fork=E2=80=99 > prints a warning when called from a multi-threaded Guile process. > > The solution is for multi-threaded Guile processes to not fork at all, > or to fork only via =E2=80=98open-pipe*=E2=80=99, =E2=80=98system*=E2=80= =99, etc., which are =E2=80=9Cknown > good=E2=80=9D (they take care of post-fork handling in the child and call= =E2=80=98exec=E2=80=99 > before anything bad could happen.) Thanks for clarifying that anyway. Mathieu