bug#6621: Emacs crash when trying to report emacs crash

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 13 Jul 2010 00:55:20 +0300
> From: Yair F <yair.f.lists@gmail.com>
> Cc: 
> 
> 2nd crash: When trying to load the file el-artsi.txt (Attached) emacs crash.
> Attached in gdb stack trace:
> 
> (gdb) run -Q ../el-artsi.txt
> Starting program: /home/yair/emacs/src/emacs/trunk/src/emacs -Q ../el-artsi.txt
> [Thread debugging using libthread_db enabled]
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x08178e07 in char_table_ref (table=150273685, c=4195671) at chartab.c:200
> 200           if (SUB_CHAR_TABLE_P (val))

I cannot reproduce this on MS-Windows, with today's trunk.  According
to the command line above, this is without bidi reordering, right?

> (gdb) bt
> #0  0x08178e07 in char_table_ref (table=150273685, c=4195671) at chartab.c:200
> #1  0x08126331 in encode_char (charset=0x8857610, c=4195671) at charset.c:1779
> #2  0x083ca76b in xfont_has_char (font=150273117, c=4195671) at xfont.c:949
> #3  0x08332a6b in font_has_char (f=0x89f5280, font=150273117,
> c=4195671) at font.c:3085
> #4  0x081d4123 in fontset_find_font (fontset=147152525, c=4195671,
> face=0x8c86308, id=-1, fallback=1) at fontset.c:649
> #5  0x081d529d in fontset_font (fontset=147323613, c=4195671,
> face=0x8c86308, id=-1) at fontset.c:767
> #6  0x081d62e6 in face_for_char (f=0x89f5280, face=0x8c86308,
> c=4195671, pos=150, object=142115250) at fontset.c:952

c=4195671 (#x400557) is a strange value for a character.  And the
character at buffer position 150 is HET, codepoint #x5d7.

> #7  0x0809c519 in get_next_display_element (it=0xbfffc338) at xdisp.c:6051

Could you please go to frame #7 and display the content of `it'?  To
this end, start GDB from the src directory, or type "source
src/.gdbinit", and then type these commands:

  (gdb) frame 7
  (gdb) pit

Then show what GDB prints in response.

Thanks.