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#27585: segfault when evaluating a file containing only backticks Date: Wed, 05 Jul 2017 22:47:22 +0300 Message-ID: <83tw2qmzsl.fsf@gnu.org> References: <1499235670.28433.1@ssh.steve.org.uk> <83van6n2ty.fsf@gnu.org> <1499280931.14677.1@ssh.steve.org.uk> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1499284093 32327 195.159.176.226 (5 Jul 2017 19:48:13 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 5 Jul 2017 19:48:13 +0000 (UTC) Cc: 27585@debbugs.gnu.org To: Steve Kemp Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Jul 05 21:48:09 2017 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 1dSqHP-0008A4-KI for geb-bug-gnu-emacs@m.gmane.org; Wed, 05 Jul 2017 21:48:07 +0200 Original-Received: from localhost ([::1]:47824 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSqHV-0008GX-2B for geb-bug-gnu-emacs@m.gmane.org; Wed, 05 Jul 2017 15:48:13 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:49329) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSqHO-0008Ft-9h for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 15:48:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSqHK-0008Fr-Am for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 15:48:06 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:51068) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dSqHK-0008Ff-7U for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 15:48:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1dSqHK-00041w-0b for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 15:48:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 05 Jul 2017 19:48:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 27585 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 27585-submit@debbugs.gnu.org id=B27585.149928407115477 (code B ref 27585); Wed, 05 Jul 2017 19:48:01 +0000 Original-Received: (at 27585) by debbugs.gnu.org; 5 Jul 2017 19:47:51 +0000 Original-Received: from localhost ([127.0.0.1]:53745 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dSqH8-00041Z-Sa for submit@debbugs.gnu.org; Wed, 05 Jul 2017 15:47:51 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:58220) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dSqH7-00041M-6Y for 27585@debbugs.gnu.org; Wed, 05 Jul 2017 15:47:49 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSqGy-00089h-0n for 27585@debbugs.gnu.org; Wed, 05 Jul 2017 15:47:43 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:38572) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSqGx-00089c-TO; Wed, 05 Jul 2017 15:47:39 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3128 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1dSqGx-0002gO-3B; Wed, 05 Jul 2017 15:47:39 -0400 In-reply-to: <1499280931.14677.1@ssh.steve.org.uk> (message from Steve Kemp on Wed, 05 Jul 2017 18:55:31 +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: 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:134222 Archived-At: > From: Steve Kemp > Date: Wed, 05 Jul 2017 18:55:31 +0000 > > > See above: the machinery to try and prevent it exists, but it doesn't > > always succeed. And it really can't be 100% reliable. So I'm unsure > > what did you expect, and why. > > Honestly? I expect Emacs to not crash. You wrote a program that triggers infinite recursion. Such programs will crash in most, if not all, languages. So your expectations are unrealistic. > I expect evaluating lisp to not kill the editor Valid Lisp, I agree. But yours isn't. Moreover, there are those among us (I'm not one of them) who thinks Emacs shouldn't even try to recover from stack overflow, they say it should crash hard right there and then. So your expectations are not necessarily shared, even as aspirations, by some developers. > > IOW: why would someone want to run such a silly "program"? > > In the real world? Nobody. Then why are we discussing this use case? Let's talk about more practical and interesting cases.