GNU bug report logs - #1295
Segfault with `M-- M-r' when `scroll-margin' > 0

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Chong Yidong <cyd <at> stupidchicken.com>
Subject: bug#1295: marked as done (Segfault with `M-- M-r' when 
 `scroll-margin' > 0)

[Message part 1 (text/plain, inline)]

Your message dated Thu, 06 Nov 2008 19:30:12 -0500
with message-id <87wsfgv0mj.fsf <at> cyd.mit.edu>
and subject line Re: Segfault with `M-- M-r' when `scroll-margin' > 0
has caused the Emacs bug report #1295,
regarding Segfault with `M-- M-r' when `scroll-margin' > 0
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact don <at> donarmstrong.com
immediately.)


-- 
1295: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=1295
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Teemu Likonen <tlikonen <at> iki.fi>
To: bug-gnu-emacs <at> gnu.org
Subject: Segfault with `M-- M-r' when `scroll-margin' > 0
Date: Sun, 02 Nov 2008 15:48:04 +0200

Emacs crashes with segmentation fault when I type command `M-- M-r'
while variable `scroll-margin' has value 1 more more.

Steps to reproduce:

 1. Start Emacs from text terminal:

        $ emacs -Q

 2. Move to Emacs reference manual buffer:

        C-h r

 3. Don't move the cursor. Set the `scroll-margin' variable:

        M-x set-variable RET scroll-margin RET 4 RET

 4. Run command `move-to-window-line' with negative argument:

        M-- M-r

 5. You should see the Emacs frame disappearing and the following error
    message in terminal:

        Fatal error (11)Segmentation fault

I have tried with Emacs version

    GNU Emacs 22.2.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11) of
    2008-10-17 on raven, modified by Debian

and development snapshot version

    GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11) of
    2008-10-18 on elegiac, modified by Debian


(I'm writing this bug report with 22.2.1 as you can see from the
following automatically inserted information.)


In GNU Emacs 22.2.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
 of 2008-10-17 on raven, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs22:/etc/emacs:/usr/local/share/emacs/22.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.2/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: fi_FI.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-h r C-s r e p o <return> <S-iso-lefttab> <return> 
<tab> <tab> <return> <down-mouse-5> <mouse-5> <down-mouse-5> 
<mouse-5> <double-down-mouse-5> <double-mouse-5> u 
<tab> <return> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
<down-mouse-4> <mouse-4> <down-mouse-1> <mouse-1> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
u <tab> <return> <help-echo> <down-mouse-5> <mouse-5> 
<down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5> M-x 
m <backspace> e m a c s - v e r s i o n <return> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5> 
<down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5> 
<down-mouse-5> <mouse-5> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
M-x C-g C-x 5 2 <switch-frame> M-x r e p o r t - b 
<tab> u <tab> <tab> <tab> <tab> <switch-frame> <switch-frame> 
<switch-frame> <switch-frame> <switch-frame> <down-mouse-4> 
<mouse-4> <down-mouse-5> <mouse-5> <down-mouse-4> <mouse-4> 
<double-down-mouse-4> <double-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<switch-frame> <down-mouse-1> <mouse-movement> <mouse-1> 
<help-echo> <down-mouse-1> <mouse-1> <M-backspace> 
e m a <tab> <return>

Recent messages:
Loading info...done
Loading jka-compr...done
uncompressing emacs.gz...done
uncompressing emacs-1.gz...done
Mark saved where search started
uncompressing emacs-5.gz...done
byte-code: Beginning of buffer [6 times]
GNU Emacs 22.2.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11) of 2008-10-17 on raven, modified by Debian
Quit
Loading emacsbug...done

[Message part 3 (message/rfc822, inline)]

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Teemu Likonen <tlikonen <at> iki.fi>
Cc: 1295-done <at> debbugs.gnu.org
Subject: Re: Segfault with `M-- M-r' when `scroll-margin' > 0
Date: Thu, 06 Nov 2008 19:30:12 -0500

> Emacs crashes with segmentation fault when I type command `M-- M-r'
> while variable `scroll-margin' has value 1 more more.

I've checked in a fix that should solve this problem.

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