From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#26932: Found the triggering behaviour Date: Wed, 22 Jan 2020 14:30:23 +0100 Message-ID: <871rrrwrdc.fsf@gnus.org> References: <87ftjjixua.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="14454"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: 26932@debbugs.gnu.org To: Vivek Dasmohapatra Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jan 22 14:34:39 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1iuG9W-0003hJ-UL for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 22 Jan 2020 14:34:38 +0100 Original-Received: from localhost ([::1]:42196 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuG9V-0001lJ-5y for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 22 Jan 2020 08:34:37 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52589) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuG63-0007KT-AC for bug-gnu-emacs@gnu.org; Wed, 22 Jan 2020 08:31:04 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iuG62-00067s-3G for bug-gnu-emacs@gnu.org; Wed, 22 Jan 2020 08:31:03 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:43243) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iuG61-00067h-Vm for bug-gnu-emacs@gnu.org; Wed, 22 Jan 2020 08:31:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1iuG61-0007xE-Rx for bug-gnu-emacs@gnu.org; Wed, 22 Jan 2020 08:31:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Lars Ingebrigtsen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 22 Jan 2020 13:31:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 26932 X-GNU-PR-Package: emacs Original-Received: via spool by 26932-submit@debbugs.gnu.org id=B26932.157969983529141 (code B ref 26932); Wed, 22 Jan 2020 13:31:01 +0000 Original-Received: (at 26932) by debbugs.gnu.org; 22 Jan 2020 13:30:35 +0000 Original-Received: from localhost ([127.0.0.1]:49213 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iuG5a-0007Zh-Ow for submit@debbugs.gnu.org; Wed, 22 Jan 2020 08:30:35 -0500 Original-Received: from quimby.gnus.org ([95.216.78.240]:60058) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iuG5Z-0007Te-Ko for 26932@debbugs.gnu.org; Wed, 22 Jan 2020 08:30:34 -0500 Original-Received: from cm-84.212.202.86.getinternet.no ([84.212.202.86] helo=marnie) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1iuG5Q-0003VL-Eu; Wed, 22 Jan 2020 14:30:27 +0100 In-Reply-To: (Vivek Dasmohapatra's message of "Mon, 20 Jan 2020 15:11:41 +0000 (GMT)") 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:175073 Archived-At: Vivek Dasmohapatra writes: >> If I understand correctly, the external lui package set buffer-undo-list >> to something invalid, and this led Emacs to segfault when gc-ing? > > Not invalid as such - entries were removed from the list while it was > "in flight" through a mapc/mapcar and a double free (or similar) > occurred. > >> Was there any further work done here, or a reproducible test case >> written? > > No test case was written, the code for lui was changed to operate on > a copy of the undo list, then assign that back to the original head > variable instead. You can make the Emacs gc segfault pretty trivially by making lists that are recursive in just the wrong way, but it'd be interesting to see just what it was that lui.el was doing. But if there's no test case, then it seem unlikely that we'll make further progress on this bug report. So I'm closing this bug report. If further progress can be made, please either open a new bug report or respond to this and it'll be reopened. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no