From unknown Mon Jun 16 23:48:17 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#49496 <49496@debbugs.gnu.org> To: bug#49496 <49496@debbugs.gnu.org> Subject: Status: 28.0.50; process-tests/fd-setsize-no-crash/make-network-process hangs on Cygwin Reply-To: bug#49496 <49496@debbugs.gnu.org> Date: Tue, 17 Jun 2025 06:48:17 +0000 retitle 49496 28.0.50; process-tests/fd-setsize-no-crash/make-network-proce= ss hangs on Cygwin reassign 49496 emacs submitter 49496 Ken Brown severity 49496 normal thanks From debbugs-submit-bounces@debbugs.gnu.org Fri Jul 09 14:07:25 2021 Received: (at submit) by debbugs.gnu.org; 9 Jul 2021 18:07:25 +0000 Received: from localhost ([127.0.0.1]:59657 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1m1uuL-0007Fa-E2 for submit@debbugs.gnu.org; Fri, 09 Jul 2021 14:07:25 -0400 Received: from lists.gnu.org ([209.51.188.17]:39914) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1m1uuK-0007FT-2W for submit@debbugs.gnu.org; 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envelope-from=kbrown@cornell.edu; helo=NAM10-BN7-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.6 (-) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.6 (--) The hang can actually be triggered by evaluating the following, extracted from the test in the subject: (setq socket-name "/tmp/socktest/socket") (delete-file socket-name) (make-network-process :name "server" :server 10 :buffer nil :service socket-name :family 'local :coding 'no-conversion :noquery t) (make-network-process :name "client" :service socket-name :family 'local :coding 'no-conversion :noquery t) The reason for the hang is that Cygwin does a blocking handshake in accept/connect to exchange credentials. This can hang in certain situations in which connect is called before a listening socket is ready to accept connections. It is possible to work around this problem by disabling the credential exchange as in the following patch: diff --git a/src/process.c b/src/process.c index b8c3e4ecfb..01548c8ab5 100644 --- a/src/process.c +++ b/src/process.c @@ -3355,6 +3355,12 @@ connect_network_socket (Lisp_Object proc, Lisp_Object addrinfos, xerrno = EMFILE; continue; } +#ifdef CYGWIN + /* Avoid possible hang in connect/accept. */ + if (family == AF_LOCAL && p->socktype == SOCK_STREAM + && setsockopt (s, SOL_SOCKET, SO_PEERCRED, 0, 0) < 0) + report_file_error ("Cannot disable credential exchange", Qnil); +#endif } if (p->is_non_blocking_client && ! (SOCK_NONBLOCK && socket_to_use < 0)) But this seems too drastic just to fix a potential problem that doesn't seem to occur in practice, but only in the contrived situation of process-tests/fd-setsize-no-crash/make-network-process. So my preference is to simply skip that test on Cygwin. OK? In GNU Emacs 28.0.50 (build 9, x86_64-pc-cygwin, GTK+ Version 3.22.28, cairo version 1.17.4) of 2021-07-09 built on moufang2 Repository revision: 68276f6d30bbdc09cc26fb49d7f0c3aa4bce35f2 Repository branch: master Windowing system distributor 'The Cygwin/X Project', version 11.0.12011000 Configured using: 'configure 'CFLAGS=-g -O0'' Configured features: ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2 LIBOTF LIBXML2 M17N_FLT MODULES NOTIFY GFILENOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB From debbugs-submit-bounces@debbugs.gnu.org Fri Jul 09 14:19:04 2021 Received: (at 49496) by debbugs.gnu.org; 9 Jul 2021 18:19:04 +0000 Received: from localhost ([127.0.0.1]:59668 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1m1v5b-0007XH-Sj for submit@debbugs.gnu.org; Fri, 09 Jul 2021 14:19:04 -0400 Received: from eggs.gnu.org ([209.51.188.92]:33310) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1m1v5a-0007Wo-MU for 49496@debbugs.gnu.org; Fri, 09 Jul 2021 14:19:03 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:60064) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1v5T-0003Qp-TT; Fri, 09 Jul 2021 14:18:55 -0400 Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:3917 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1v5T-0007rK-Hh; Fri, 09 Jul 2021 14:18:55 -0400 Date: Fri, 09 Jul 2021 21:18:43 +0300 Message-Id: <83bl7bcpvg.fsf@gnu.org> From: Eli Zaretskii To: Ken Brown In-Reply-To: <8dec2b34-f041-35e8-1971-da2596a8b760@cornell.edu> (message from Ken Brown on Fri, 9 Jul 2021 14:01:33 -0400) Subject: Re: bug#49496: 28.0.50; process-tests/fd-setsize-no-crash/make-network-process hangs on Cygwin References: <8dec2b34-f041-35e8-1971-da2596a8b760@cornell.edu> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 49496 Cc: 49496@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -3.3 (---) > From: Ken Brown > Date: Fri, 9 Jul 2021 14:01:33 -0400 > > It is possible to work around this problem by disabling the credential exchange > as in the following patch: > > diff --git a/src/process.c b/src/process.c > index b8c3e4ecfb..01548c8ab5 100644 > --- a/src/process.c > +++ b/src/process.c > @@ -3355,6 +3355,12 @@ connect_network_socket (Lisp_Object proc, Lisp_Object > addrinfos, > xerrno = EMFILE; > continue; > } > +#ifdef CYGWIN > + /* Avoid possible hang in connect/accept. */ > + if (family == AF_LOCAL && p->socktype == SOCK_STREAM > + && setsockopt (s, SOL_SOCKET, SO_PEERCRED, 0, 0) < 0) > + report_file_error ("Cannot disable credential exchange", Qnil); > +#endif > } > if (p->is_non_blocking_client && ! (SOCK_NONBLOCK && socket_to_use < 0)) > > But this seems too drastic just to fix a potential problem that doesn't seem to > occur in practice, but only in the contrived situation of > process-tests/fd-setsize-no-crash/make-network-process. So my preference is to > simply skip that test on Cygwin. > > OK? Yes, OK. But please explain there in a comment why we skip that, with a reference to this bug. (FWIW, I consider the process-tests suite to be not useful enough, in that it many times tests behavior that is only guaranteed to happen on GNU/Linux, and is not really required, nor should be expected, in portable Lisp programs. So it doesn't surprise me that some of the tests fail on some systems.) 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dkim=none (message not signed) header.d=none;debbugs.gnu.org; dmarc=none action=none header.from=cornell.edu; Received: from BN7PR04MB4388.namprd04.prod.outlook.com (2603:10b6:406:f8::19) by BN7PR04MB3956.namprd04.prod.outlook.com (2603:10b6:406:c2::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.22; Fri, 9 Jul 2021 20:43:21 +0000 Received: from BN7PR04MB4388.namprd04.prod.outlook.com ([fe80::cda2:359c:cb66:5c42]) by BN7PR04MB4388.namprd04.prod.outlook.com ([fe80::cda2:359c:cb66:5c42%7]) with mapi id 15.20.4308.021; Fri, 9 Jul 2021 20:43:21 +0000 Subject: Re: bug#49496: 28.0.50; process-tests/fd-setsize-no-crash/make-network-process hangs on Cygwin To: Eli Zaretskii References: <8dec2b34-f041-35e8-1971-da2596a8b760@cornell.edu> <83bl7bcpvg.fsf@gnu.org> From: Ken Brown Message-ID: Date: Fri, 9 Jul 2021 16:42:36 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 In-Reply-To: <83bl7bcpvg.fsf@gnu.org> Content-Type: text/plain; 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But please explain there in a comment why we skip that, with > a reference to this bug. Done. Closing. From unknown Mon Jun 16 23:48:17 2025 Received: (at fakecontrol) by fakecontrolmessage; To: internal_control@debbugs.gnu.org From: Debbugs Internal Request Subject: Internal Control Message-Id: bug archived. Date: Sat, 07 Aug 2021 11:24:06 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator