From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#23259: 25.1.50; Xerror: "BadLength" on extreme zoom causing emacs to segfault Date: Sun, 10 Apr 2016 18:01:56 +0300 Message-ID: <83vb3ph5i3.fsf@gnu.org> References: <87zit120yf.fsf@mattleach.net> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1460300595 9765 80.91.229.3 (10 Apr 2016 15:03:15 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 10 Apr 2016 15:03:15 +0000 (UTC) Cc: 23259@debbugs.gnu.org To: Matthew Leach Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Apr 10 17:03:10 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1apGtJ-00069K-Vb for geb-bug-gnu-emacs@m.gmane.org; Sun, 10 Apr 2016 17:03:10 +0200 Original-Received: from localhost ([::1]:35198 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1apGtJ-0000fF-1A for geb-bug-gnu-emacs@m.gmane.org; Sun, 10 Apr 2016 11:03:09 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48307) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1apGtF-0000d6-LK for bug-gnu-emacs@gnu.org; Sun, 10 Apr 2016 11:03:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1apGtC-0005rT-GL for bug-gnu-emacs@gnu.org; Sun, 10 Apr 2016 11:03:05 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:45029) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1apGtC-0005rP-D5 for bug-gnu-emacs@gnu.org; Sun, 10 Apr 2016 11:03:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1apGtC-0003fP-42 for bug-gnu-emacs@gnu.org; Sun, 10 Apr 2016 11:03:02 -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, 10 Apr 2016 15:03:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 23259 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 23259-submit@debbugs.gnu.org id=B23259.146030056014063 (code B ref 23259); Sun, 10 Apr 2016 15:03:02 +0000 Original-Received: (at 23259) by debbugs.gnu.org; 10 Apr 2016 15:02:40 +0000 Original-Received: from localhost ([127.0.0.1]:57366 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1apGsq-0003ek-AR for submit@debbugs.gnu.org; Sun, 10 Apr 2016 11:02:40 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:57218) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1apGso-0003eU-Pr for 23259@debbugs.gnu.org; Sun, 10 Apr 2016 11:02:38 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1apGsg-0005gU-Ju for 23259@debbugs.gnu.org; Sun, 10 Apr 2016 11:02:33 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:39073) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1apGsg-0005gQ-H3; Sun, 10 Apr 2016 11:02:30 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3472 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1apGsf-0003K9-S5; Sun, 10 Apr 2016 11:02:30 -0400 In-reply-to: <87zit120yf.fsf@mattleach.net> (message from Matthew Leach on Sun, 10 Apr 2016 11:49:12 +0100) 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:116318 Archived-At: > From: Matthew Leach > Date: Sun, 10 Apr 2016 11:49:12 +0100 > > emacs -Q > open a file, emacs/src/process.c, say. > C-x C-= > and keep pressing > C-= > > Emacs will grind to a halt a little but will eventually segfault when > the zoom is extreme enough. > > Attached is the backtrace. It looks as though X has thrown an error, > maybe we need to limit the amount of zoom that Emacs allows? Probably. However, the interesting question is: what values to use as limits? Also, this backtrace is not useful, since the X errors are by default asynchronous. Could you please run Emacs in synchronous X mode (see etc/DEBUG for how), and present the backtrace then? Also, please tell: . what is the maximum value of the scale factor you see on the mode line before Emacs crashes . what is the value returned by display-pixel-width . what is the values returned by frame-char-width and frame-char-height I'll try to prepare a patch using the above data. Thanks.