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SIGSEGV reading email in Gnus - GIF support problem?


From: Charles Sebold
Subject: SIGSEGV reading email in Gnus - GIF support problem?
Date: Wed, 05 Dec 2001 10:25:52 -0600

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 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-10-24 on sebold
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: 
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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

Displaying a certain GIF in Emacs 21.1 causes it to SIGSEGV.  I
discovered this when it was mailed to me by somebody and I tried to view
it in Gnus.  I am running Debian unstable, up-to-date as of this
morning.

The following are the versions of GIF libraries that I have on this
system, according to Debian's package management.  I compiled this
binary of Emacs myself with no patches.

ii  giflib3g       3.0-6          shared library for GIF images (runtime lib)
ii  libungif4-dev  4.1-9          shared library for GIF images (development f
ii  libungif4g     4.1-9          shared library for GIF images (runtime lib)


Here's the backtrace from GDB:

Program received signal SIGSEGV, Segmentation fault.
0x40361a5b in free () from /lib/libc.so.6
(gdb) bt
#0  0x40361a5b in free () from /lib/libc.so.6
#1  0x0810f1ba in emacs_blocked_free (ptr=0x10) at alloc.c:688
#2  0x40361a49 in free () from /lib/libc.so.6
#3  0x401c2956 in FreeMapObject () from /usr/lib/libungif.so.4
#4  0x401c2e98 in FreeSavedImages () from /usr/lib/libungif.so.4
#5  0x401c084b in DGifCloseFile () from /usr/lib/libungif.so.4
#6  0x080c4b88 in gif_load (f=0x844ae38, img=0x8a0ab10) at xfns.c:9899
#7  0x080bffea in lookup_image (f=0x844ae38, spec=1483533092) at xfns.c:6099
#8  0x0805ec79 in handle_single_display_prop (it=0xbfffe734, prop=1483533092, 
    object=1217783288, position=0xbfffe7b8, display_replaced_before_p=0)
    at xdisp.c:3044
#9  0x0805e3f4 in handle_display_prop (it=0xbfffe734) at xdisp.c:2758
#10 0x0805d491 in handle_stop (it=0xbfffe734) at xdisp.c:2002
#11 0x080602cd in reseat (it=0xbfffe734, pos={charpos = 1, bytepos = 1}, 
    force_p=1) at xdisp.c:4008
#12 0x0805cf4f in init_iterator (it=0xbfffe734, w=0x844af60, charpos=1, 
    bytepos=1, row=0x84f70b0, base_face_id=DEFAULT_FACE_ID) at xdisp.c:1691
#13 0x0805cfea in start_display (it=0xbfffe734, w=0x844af60, pos=
      {charpos = 1, bytepos = 1}) at xdisp.c:1710
#14 0x08069d34 in try_window (window=1212460896, pos=
      {charpos = 1, bytepos = 1}) at xdisp.c:10557
#15 0x080691e2 in redisplay_window (window=1212460896, just_this_one_p=0)
    at xdisp.c:10230
#16 0x08066f11 in redisplay_windows (window=1212460896) at xdisp.c:9182
#17 0x08066f04 in redisplay_windows (window=1217706600) at xdisp.c:9180
#18 0x080666bb in redisplay_internal (preserve_echo_area=1) at xdisp.c:8786
#19 0x08066b3a in redisplay_preserve_echo_area (from_where=2) at xdisp.c:9006
#20 0x08056c92 in sit_for (sec=0, usec=100000, reading=0, display=1, 
    initial_display=1) at dispnew.c:6233
#21 0x080d19d5 in command_loop_1 () at keyboard.c:1669
#22 0x08121ea9 in internal_condition_case (bfun=0x80d0dd0 <command_loop_1>, 
    handlers=405283356, hfun=0x80d0a14 <cmd_error>) at eval.c:1267
#23 0x080d0ca8 in command_loop_2 () at keyboard.c:1245
#24 0x08121a3d in internal_catch (tag=405244964, 
    func=0x80d0c84 <command_loop_2>, arg=405187036) at eval.c:1030
#25 0x080d0c57 in command_loop () at keyboard.c:1224
#26 0x080d07d1 in recursive_edit_1 () at keyboard.c:950
#27 0x080d0900 in Frecursive_edit () at keyboard.c:1006
#28 0x080cf86f in main (argc=1, argv=0xbffff724, envp=0xbffff72c)
    at emacs.c:1547
#29 0x4030c65f in __libc_start_main () from /lib/libc.so.6

I have the GIF itself uploaded to my homepage if you are interested in
trying it on your own.

http://www.livingtorah.org/~csebold/breaksemacs.gif

If you want more information I would be happy to supply it.  Sorry I
know nothing about GDB or I would try to supply more now.

Recent input:
<help-echo> C-x 1 <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
C-h d C-g C-h C-h SPC SPC SPC ESC C-x C-f / u s <tab> 
l o c <tab> s h <tab> e m <tab> 2 1 <tab> e t <tab> 
D <tab> E <tab> <return> C-v C-v C-v C-v C-v C-v C-v 
C-v M-x e m <tab> <backspace> <backspace> C-g <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar> 
<help-menu> <report-emacs-bug>

Recent messages:
Preparing diary...done
Loading two-column...done
For information about the GNU Project and its goals, type C-h C-p.
setq: Quit
Loading view...done

Preparing diary...
Making completion list... [2 times]
call-interactively: Quit
Loading emacsbug...done

-- 
Charles Sebold                                      20th of Kislev, 5762
LCMS - Office of Information Systems                http://unix.ois.org/
        *** Opinions expressed herein are not necessarily ***
        *** those of the Lutheran Church - Missouri Synod ***



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