From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#24325: 25.1; Crash - fd larger than FD_SETSIZE Date: Sun, 28 Aug 2016 20:53:24 +0300 Message-ID: <83wpj0bx0r.fsf@gnu.org> References: Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1472406860 15536 195.159.176.226 (28 Aug 2016 17:54:20 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 28 Aug 2016 17:54:20 +0000 (UTC) Cc: 24325@debbugs.gnu.org To: Robin Campbell Joy Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Aug 28 19:54:16 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1be4Hf-0003VG-5p for geb-bug-gnu-emacs@m.gmane.org; Sun, 28 Aug 2016 19:54:15 +0200 Original-Received: from localhost ([::1]:40195 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1be4Hc-0001cG-Nq for geb-bug-gnu-emacs@m.gmane.org; Sun, 28 Aug 2016 13:54:12 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:42881) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1be4HW-0001bz-Qd for bug-gnu-emacs@gnu.org; Sun, 28 Aug 2016 13:54:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1be4HS-0005T6-Ix for bug-gnu-emacs@gnu.org; Sun, 28 Aug 2016 13:54:05 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:45290) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1be4HS-0005Sy-Fg for bug-gnu-emacs@gnu.org; Sun, 28 Aug 2016 13:54:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1be4HS-0001NT-8c for bug-gnu-emacs@gnu.org; Sun, 28 Aug 2016 13:54:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 28 Aug 2016 17:54:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 24325 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 24325-submit@debbugs.gnu.org id=B24325.14724068345281 (code B ref 24325); Sun, 28 Aug 2016 17:54:02 +0000 Original-Received: (at 24325) by debbugs.gnu.org; 28 Aug 2016 17:53:54 +0000 Original-Received: from localhost ([127.0.0.1]:43002 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1be4HK-0001N6-5g for submit@debbugs.gnu.org; Sun, 28 Aug 2016 13:53:54 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:51868) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1be4HH-0001Mu-VN for 24325@debbugs.gnu.org; Sun, 28 Aug 2016 13:53:52 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1be4H9-0005Ps-Iv for 24325@debbugs.gnu.org; Sun, 28 Aug 2016 13:53:46 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:52893) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1be4H9-0005Pm-FU; Sun, 28 Aug 2016 13:53:43 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:2865 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1be4H5-0006ya-L0; Sun, 28 Aug 2016 13:53:42 -0400 In-reply-to: (message from Robin Campbell Joy on Sun, 28 Aug 2016 11:25:39 +0200) 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: 208.118.235.43 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:122747 Archived-At: > From: Robin Campbell Joy > Date: Sun, 28 Aug 2016 11:25:39 +0200 > > After a short time emacs is crashing while trying to communicate with an > external process. > > In the debugger I can see that the fd is larger than FD_SETSIZE. The fd > is used in process.c:7168-7177 (setup_process_coding_system) to index > into proc_decode_coding_system which is of size FD_SETSIZE and is > crashing at process.c:5708 when dereferencing coding->id. Do you really have several hundreds of subprocesses and/or network connections active in that session? If not, how come all the descriptors below 1024 are in use? I also don't understand how this: > #0 0x00000000004942a4 in setup_coding_system (coding_system=4602512, coding=0xffffffffffffffff) at > coding.c:5706 > eol_type = ^^^^^^^^^^^^ Can happen in a build that claims to use 'CFLAGS=-ggdb3 -O0'. Did you report the bug from the same binary that crashes? I guess we will have to refuse to handle a process if its infd and outfd are at or above FD_SETSIZE, like we do on MS-Windows?