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Fface_font crashes if face->font_name == NULL

From: Alan Shutko
Subject: Fface_font crashes if face->font_name == NULL
Date: Mon, 05 Nov 2001 18:37:09 -0500
User-agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/21.1 (i386-debian-linux-gnu)

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.1.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-10-25 on raven, modified by Debian
configured using `configure  i386-debian-linux-gnu --prefix=/usr 
--sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib 
--infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --with-x=yes 
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I've been debugging why I was seeing boxes for the default
variable-pitch font.  I was recommended to invoke (face-font
'variable-pitch) to see what Emacs was looking for.  This crashed

It turns out that Emacs was looking for
"-adobe-helvetica-medium-r-normal--13-125-75-75-p-0-iso8859-1", which
didn't exist.  (Something had hosed a fonts.dir.)  The backtrace is
below.  test-crash.el looks like:

(setq scalable-fonts-allowed t)
(face-font 'variable-pitch)

I can provide more information if necessary.

(gdb) run -q -l ~/test-crash.el
Starting program: /home/ats/nobackup/emacs-21.1/src/emacs -q -l ~/test-crash.el

Program received signal SIGSEGV, Segmentation fault.
0x0810fde7 in build_string (str=0x0) at alloc.c:1840
(gdb) up
#1  0x0809be3b in Fface_font (face=405865012, frame=405187036) at xfaces.c:4678
(gdb) p face
$2 = (struct face *) 0x83d4900
(gdb) p *face
$3 = {
  id = 138233656, 
  gc = 0x83d48e0, 
  font = 0x83d48f4, 
  stipple = 0, 
  foreground = 7, 
  background = 33, 
  underline_color = 3, 
  overline_color = 138234080, 
  strike_through_color = 405698740, 
  box_color = 405596260, 
  font_name = 0x182f2d74 <Address 0x182f2d74 out of bounds>, 
  font_info_id = 0, 
  fontset = 32, 
  pixmap_w = 17, 
  pixmap_h = 1, 
  box_line_width = 137805608, 
  box = 134217852, 
  use_box_color_for_shadows_p = 1, 
  lface = {6, 0, 138798520, 0, 0, 0, 0, 0, 0, 0, 138808040, 0, 9, 0, 0, 0, 0}, 
  hash = 0, 
  charset = 405187396, 
  underline_p = 0, 
  overline_p = 0, 
  strike_through_p = 1, 
  foreground_defaulted_p = 0, 
  background_defaulted_p = 0, 
  underline_defaulted_p = 0, 
  overline_color_defaulted_p = 1, 
  strike_through_color_defaulted_p = 1, 
  box_color_defaulted_p = 1, 
  tty_bold_p = 0, 
  tty_dim_p = 0, 
  tty_underline_p = 1, 
  tty_alt_charset_p = 0, 
  tty_reverse_p = 1, 
  tty_blinking_p = 1, 
  next = 0x18277574, 
  prev = 0x51, 
  ascii_face = 0x1826adb4

Recent input:
e <return> p SPC * f a c e <return> <prior> <prior> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <help-echo> <mouse-movement> <help-echo> 
<mouse-movement> <help-echo> <mouse-movement> <help-echo> 
<mouse-movement> <help-echo> <mouse-movement> <down-mouse-1> 
<mouse-1> C-a C-a C-a <home> C-x C-x C-a <left> <left> 
<left> <left> <left> <left> C-SPC <end> M-w C-x o C-x 
b <return> C-x C-b SPC SPC SPC SPC SPC SPC SPC <end> 
<prior> M-x M-p M-p <return>

Recent messages:
Mark set [4 times]
Mark saved where search started [2 times]
Loading emacsbug...done
comint-search-arg: Not at command line
History item: 1
Saved text from "(gdb) run -q -l ~/test-crash.el
Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %; q to quit; ? for help.

Alan Shutko <address@hidden> - In a variety of flavors!
Don't let your mind wander -- it's too little to be let out alone.

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