From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#23386: Segfault when messing with font-backend Date: Wed, 27 Apr 2016 10:23:00 -0400 Message-ID: References: <83y47zxi81.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1461767009 21103 80.91.229.3 (27 Apr 2016 14:23:29 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 27 Apr 2016 14:23:29 +0000 (UTC) Cc: 23386@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Apr 27 16:23:17 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 1avQN3-000602-1x for geb-bug-gnu-emacs@m.gmane.org; Wed, 27 Apr 2016 16:23:17 +0200 Original-Received: from localhost ([::1]:43515 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avQN2-00019A-5S for geb-bug-gnu-emacs@m.gmane.org; Wed, 27 Apr 2016 10:23:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34823) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avQMt-0000tc-0p for bug-gnu-emacs@gnu.org; Wed, 27 Apr 2016 10:23:11 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1avQMp-0003CD-OI for bug-gnu-emacs@gnu.org; Wed, 27 Apr 2016 10:23:06 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:37826) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avQMo-00039u-8b for bug-gnu-emacs@gnu.org; Wed, 27 Apr 2016 10:23:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1avQMo-0003ZU-3d for bug-gnu-emacs@gnu.org; Wed, 27 Apr 2016 10:23:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 27 Apr 2016 14:23:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 23386 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 23386-submit@debbugs.gnu.org id=B23386.146176695713679 (code B ref 23386); Wed, 27 Apr 2016 14:23:02 +0000 Original-Received: (at 23386) by debbugs.gnu.org; 27 Apr 2016 14:22:37 +0000 Original-Received: from localhost ([127.0.0.1]:50163 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1avQMO-0003YZ-T0 for submit@debbugs.gnu.org; Wed, 27 Apr 2016 10:22:37 -0400 Original-Received: from chene.dit.umontreal.ca ([132.204.246.20]:58736) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1avQMN-0003YQ-66 for 23386@debbugs.gnu.org; Wed, 27 Apr 2016 10:22:35 -0400 Original-Received: from ceviche.home (lechon.iro.umontreal.ca [132.204.27.242]) by chene.dit.umontreal.ca (8.14.7/8.14.1) with ESMTP id u3REMX59007553; Wed, 27 Apr 2016 10:22:33 -0400 Original-Received: by ceviche.home (Postfix, from userid 20848) id B7379661ED; Wed, 27 Apr 2016 10:23:00 -0400 (EDT) In-Reply-To: <83y47zxi81.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 27 Apr 2016 17:02:38 +0300") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 1 Rules triggered RV5655=0 X-NAI-Spam-Version: 2.3.0.9418 : core <5655> : inlines <4726> : streams <1626167> : uri <2197836> 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:116913 Archived-At: >> % emacs -Q --eval "(push '(font-backend x) default-frame-alist)" >> I get a segfault. This is with the latest emacs-25. > Not reproducible here, but then I cannot run an X version. (I did try > an equivalent for Windows; it didn't crash.) Not surprised: it seems specific to the X11 code. >> Program received signal SIGSEGV, Segmentation fault. >> 0xf70b3b36 in XftCharIndex () from /usr/lib/i386-linux-gnu/libXft.so.2 >> (gdb) xbacktrace >> (gdb) bt >> #0 0xf70b3b36 in XftCharIndex () from /usr/lib/i386-linux-gnu/libXft.so.2 >> #1 0x082d4d69 in xftfont_encode_char (font=0x8779b00, c=92) at xftfont.c:537 > Can you tell which arguments to XftCharIndex were invalid in this > case? I guess it's the second arg (xftfont_info->xftfont), which is NULL. Program received signal SIGSEGV, Segmentation fault. 0xf70b3b36 in XftCharIndex () from /usr/lib/i386-linux-gnu/libXft.so.2 (gdb) up #1 0x082d4d69 in xftfont_encode_char (font=0x8779af0, c=92) at xftfont.c:537 (gdb) p xftfont_info->display $1 = (Display *) 0x86f2368 (gdb) p xftfont_info->xftfont $2 = (XftFont *) 0x0 (gdb) p c $3 = 92 (gdb) > Also, is 'x' a valid font-backend symbol? AFAIK yes. > It's strange that Emacs uses xftfont when it should have been using > xfont instead (AFAIU). Indeed, that seems to be a big part of the problem. Stefan