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bug#27761: Crash while using proof-general/company-coq on OS X


From: Денис Редозубов
Subject: bug#27761: Crash while using proof-general/company-coq on OS X
Date: Thu, 3 Aug 2017 11:10:01 +0300

(gdb) p *$12
$13 = {
  size = 4,
  size_byte = -1,
  intervals = 0x102a31430,
  data = "" " 163"
}
(gdb) up
#10438 0x00000001000393d4 in get_next_display_element (it=0x7fff5fbd5bb0)
    at xdisp.c:7324
7324      success_p = get_next_display_element (it);
(gdb) p it->current
$14 = {
  pos = {
    charpos = 4138,
    bytepos = 4138
  },
  overlay_string_index = -1,
  string_pos = {
    charpos = 6,
    bytepos = 6
  },
  dpvec_index = -1
}
(gdb) p it->sp
$15 = 2
(gdb) p it->string
$16 = Python Exception <type 'exceptions.AttributeError'> 'NoneType' object has no attribute 'value':

(gdb) xstring
$17 = (struct Lisp_String *) 0x10da1ee10
" 163"

2017-08-02 20:32 GMT+03:00 Eli Zaretskii <eliz@gnu.org>:
> From: Денис Редозубов <denis.redozubov@gmail.com>
> Date: Wed, 2 Aug 2017 10:53:20 +0300
> Cc: Eli Zaretskii <eliz@gnu.org>, 27761@debbugs.gnu.org,
>       "Charles A. Roelli" <charles@aurox.ch>
>
> 7324 success_p = get_next_display_element (it);
> (gdb) p it->current
> $7 = {
> pos = {
> charpos = 4138,
> bytepos = 4138
> },
> overlay_string_index = -1,
> string_pos = {
> charpos = 6,
> bytepos = 6
> },
> dpvec_index = -1
> }
> (gdb) p it->sp
> $8 = 2
> (gdb) p it->object
> $9 = Python Exception <type 'exceptions.AttributeError'> 'NoneType' object has no attribute 'value':
>
> (gdb) xtype
> Lisp_String
> (gdb) p it->position
> $10 = {
> charpos = 0,
> bytepos = 0
> }
> (gdb) p it->string
> $11 = Python Exception <type 'exceptions.AttributeError'> 'NoneType' object has no attribute 'value':
>
> (gdb) xstring
> $12 = (struct Lisp_String *) 0x10da1ee10
> " 163"

Thanks.  The "charpos = 6" part puzzles me, because the string is only
4 characters long.  What does this produce:

  (gdb) p *$12
  (gdb) up
  (gdb) p it->current
  (gdb) p it->sp
  (gdb) p it->string
  (gdb) xstring


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