From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Printing to STDERR when %d is "Cannot access memory ..." Date: Wed, 13 Jun 2018 22:11:33 +0300 Message-ID: <83wov233iy.fsf@gnu.org> References: Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1528917011 29253 195.159.176.226 (13 Jun 2018 19:10:11 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 13 Jun 2018 19:10:11 +0000 (UTC) Cc: emacs-devel@gnu.org To: Keith David Bershatsky Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Jun 13 21:10:07 2018 Return-path: Envelope-to: ged-emacs-devel@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 1fTB9i-0007UJ-NT for ged-emacs-devel@m.gmane.org; Wed, 13 Jun 2018 21:10:06 +0200 Original-Received: from localhost ([::1]:36464 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fTBBp-0008JP-WD for ged-emacs-devel@m.gmane.org; Wed, 13 Jun 2018 15:12:18 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:40403) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fTBBG-0008JJ-Bo for emacs-devel@gnu.org; Wed, 13 Jun 2018 15:11:43 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fTBBD-0000vk-60 for emacs-devel@gnu.org; Wed, 13 Jun 2018 15:11:42 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:59388) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fTBBD-0000v1-28; Wed, 13 Jun 2018 15:11:39 -0400 Original-Received: from [176.228.60.248] (port=2591 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1fTBBC-0005A4-HD; Wed, 13 Jun 2018 15:11:38 -0400 In-reply-to: (message from Keith David Bershatsky on Wed, 13 Jun 2018 11:37:09 -0700) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:226304 Archived-At: > Date: Wed, 13 Jun 2018 11:37:09 -0700 > From: Keith David Bershatsky > > I am working on crosshairs (17684) and multiple fake cursors (22873) and created a little problem for myself in that a character not recognized by the font (U0001D4D5) [aka a pretty letter f] on a line all by itself does not have a font->space_width and causes Emacs to crash when printing said value to STDERR. > > GDB returns "Cannot access memory at address 0xa0" when printing the value of font->space_width. This message means that 'font' is a NULL pointer, and that is your basic problem. You need to find out why 'font' is NULL.