crash in display, triggered by calendar

[Sam Steingold]

GNU Emacs 21.3.50.22 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-08-06 on glip.premonitia.com

in the CVS head emacs, build a minute ago:

emacs has a long-standing bug: diary requires that diary-file 
(normally "~/.diary") to be writable or to start with a newline.
Now this old bug triggers a crash.

$ cd ~
$ mv .diary .diary.tmp
$ echo ';' > .diary
$ cat .diary.tmp >> .diary
$ rm -f .diary.tmp
$ chmod -w .diary
$ emacs
M-x calendar
M-x view-diary-entries

you will get a message in the minibuffer that #<buffer .diary> is
read-only (even if you set debug-on-error to t, you will not get a
backtrace!)

C-x b .diary RET

===> CRASH!!!


Program received signal SIGSEGV, Segmentation fault.
next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4819
4819      int success_p = 1;
(gdb) where
#0  next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4819
#1  0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#2  0x0806053f in forward_to_next_line_start (it=0xbfffe3f0, 
    skipped_p=0xbf8000a8) at xdisp.c:3871
#3  0x08060781 in reseat_at_next_visible_line_start (it=0xbfffe3f0, 
    on_newline_p=1) at xdisp.c:3996
#4  0x0806165b in next_element_from_ellipsis (it=0xbfffe3f0) at xdisp.c:4775
#5  0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#6  0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#7  0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#8  0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#9  0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#10 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#11 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#12 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#13 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#14 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#15 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#16 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#17 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#18 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#19 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#20 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#21 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#22 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#23 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#24 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#25 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#26 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#27 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#28 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#29 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#30 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#31 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#32 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#33 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#34 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#35 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#36 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#37 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#38 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#39 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#40 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#41 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#42 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#43 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#44 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#45 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#46 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#47 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#48 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#49 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#50 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#51 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#52 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#53 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#54 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#55 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#56 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
---Type <return> to continue, or q <return> to quit---
#57 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#58 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#59 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#60 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#61 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#62 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#63 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#64 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#65 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#66 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#67 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#68 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#69 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#70 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#71 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#72 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#73 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#74 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#75 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#76 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#77 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#78 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#79 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#80 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#81 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#82 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#83 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#84 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#85 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#86 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#87 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#88 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#89 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#90 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#91 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#92 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#93 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#94 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#95 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#96 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#97 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#98 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#99 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#100 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#101 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#102 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#103 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#104 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#105 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#106 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#107 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#108 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#109 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#110 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#111 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#112 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#113 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
#114 0x08060b88 in get_next_display_element (it=0xbfffe3f0) at xdisp.c:4213
#115 0x080618eb in next_element_from_buffer (it=0xbfffe3f0) at xdisp.c:4909
---Type <return> to continue, or q <return> to quit---q
Quit
(gdb) p it
$3 = (struct it *) 0xbfffe3f0
(gdb) p *it
$4 = {
  window = 1212942904, 
  w = 0x84c0a38, 
  f = 0x84c0910, 
  method = 0x80616a4 <next_element_from_buffer>, 
  stop_charpos = 5866, 
  end_charpos = 5866, 
  s = 0x0, 
  string_nchars = 0, 
  region_beg_charpos = -1, 
  region_end_charpos = -1, 
  redisplay_end_trigger_charpos = 0, 
  multibyte_p = 1, 
  header_line_p = 0, 
  string_from_display_prop_p = 0, 
  dp = 0x82d3f88, 
  dpvec = 0x0, 
  dpend = 0xbfffe43c, 
  dpvec_char_len = 1, 
  saved_face_id = 0, 
  ctl_chars = {94, 77, 0 <repeats 14 times>}, 
  current = {
    pos = {
      charpos = 5865, 
      bytepos = 5865
    }, 
    overlay_string_index = -1, 
    string_pos = {
      charpos = -1, 
      bytepos = -1
    }, 
    dpvec_index = -1
  }, 
  overlay_strings = {0, 0, 0}, 
  n_overlay_strings = 0, 
  string = 405361476, 
  stack = {{
      stop_charpos = 0, 
      face_id = 0, 
      string = 0, 
      pos = {
        pos = {
          charpos = 0, 
          bytepos = 0
        }, 
        overlay_string_index = 0, 
        string_pos = {
          charpos = 0, 
          bytepos = 0
        }, 
        dpvec_index = 0
      }, 
      end_charpos = 0, 
      string_nchars = 0, 
      area = LEFT_MARGIN_AREA, 
      multibyte_p = 0, 
      string_from_display_prop_p = 0, 
      display_ellipsis_p = 0, 
      space_width = 0, 
---Type <return> to continue, or q <return> to quit---
      voffset = 0, 
      font_height = 0
    }, {
      stop_charpos = 0, 
      face_id = 0, 
      string = 0, 
      pos = {
        pos = {
          charpos = 0, 
          bytepos = 0
        }, 
        overlay_string_index = 0, 
        string_pos = {
          charpos = 0, 
          bytepos = 0
        }, 
        dpvec_index = 0
      }, 
      end_charpos = 0, 
      string_nchars = 0, 
      area = LEFT_MARGIN_AREA, 
      multibyte_p = 0, 
      string_from_display_prop_p = 0, 
      display_ellipsis_p = 0, 
      space_width = 0, 
      voffset = 0, 
      font_height = 0
    }}, 
  sp = 0, 
  selective_display_ellipsis_p = 0, 
  ctl_arrow_p = 1, 
  selective = 0, 
  what = IT_CHARACTER, 
  face_id = 0, 
  face_box_p = 0, 
  start_of_box_run_p = 0, 
  end_of_box_run_p = 0, 
  overlay_strings_at_end_processed_p = 1, 
  glyph_not_available_p = 0, 
  starts_in_middle_of_char_p = 0, 
  face_before_selective_p = 1, 
  base_face_id = 0, 
  c = 13, 
  len = 1, 
  cmp_id = 0, 
  cmp_len = 0, 
  char_to_display = 33, 
  image_id = 0, 
  space_width = 405361476, 
  voffset = 0, 
  font_height = 405361476, 
  object = 1215887680, 
  position = {
    charpos = 5865, 
    bytepos = 5865
  }, 
  truncate_lines_p = 0, 
  tab_width = 8, 
  truncation_pixel_width = 0, 
---Type <return> to continue, or q <return> to quit---
  continuation_pixel_width = 0, 
  first_visible_x = 0, 
  last_visible_x = 480, 
  last_visible_y = 725, 
  extra_line_spacing = 0, 
  glyph_row = 0x84d149c, 
  area = TEXT_AREA, 
  nglyphs = 1, 
  pixel_width = 6, 
  ascent = 11, 
  descent = 2, 
  max_ascent = 11, 
  max_descent = 2, 
  phys_ascent = 9, 
  phys_descent = 0, 
  max_phys_ascent = 11, 
  max_phys_descent = 2, 
  current_x = 402, 
  continuation_lines_width = 0, 
  current_y = 91, 
  vpos = 7, 
  hpos = 59
}



 

-- 
Sam Steingold (http://www.podval.org/~sds) running RedHat7.3 GNU/Linux
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.palestine-central.com/links.html>
Are you smart enough to use Lisp?