bug#3659: FW: 23.0.95; crash on set-frame-font

[Kenichi Handa]

In article 
<63C2A154B1708946B60726AFDBA00AC00676DBAF@ukmailemea01.misys.global.ad>, 
"Marshall, Simon" <Simon.Marshall@misys.com> writes:

> Breakpoint 3, Fsignal (error_symbol=5385409, data=6603597) at
> eval.c:1641
> 1641      register struct handler *allhandlers = handlerlist;
> (gdb) where
> #0  Fsignal (error_symbol=5385409, data=6603597) at eval.c:1641
> #1  0x002813e8 in xsignal (error_symbol=5385409, data=6603597) at
> eval.c:1751
> #2  0x00281480 in xsignal2 (error_symbol=5385409, arg1=5385985,
> arg2=5314561) at eval.c:1775
> #3  0x00259ab0 in wrong_type_argument (predicate=5385985, value=5314561)
> at data.c:115
> #4  0x000df1c8 in load_charset_map_from_vector (charset=0x369f30,
> vec=5314561, control_flag=2)
>     at charset.c:608
> #5  0x000df57c in load_charset (charset=0x369f30, control_flag=2) at
> charset.c:658
> #6  0x000e61b8 in encode_char (charset=0x369f30, c=192) at
> charset.c:1807

Ok, so the Fsignal call is because "*charset" is completely
broken (according to your previous mail).

> #7  0x003337c4 in xfont_chars_supported (chars=9656829, xfont=0xbf4200,
> encoding=0x369f30, 
>     repertory=0x0) at xfont.c:238
> #8  0x0033458c in xfont_supported_scripts (display=0xa0e000,
> fontname=0xc83dfb "--------0------", 
>     props=5454596, encoding=0x369f30) at xfont.c:328

Your previous backtrace didn't show that
xfont_supported_scripts is called.  It may be because the
previous backtrace was made by the emacs compiled with -O2.

Anyway, the above fontname has a strange format.  For such a
fontname, xfont_supported_scripts should not be called from
xfont_list_pattern.

> #9  0x00334e30 in xfont_list_pattern (display=0xa0e000, 
>     pattern=0xffbeca84 "-*-*-*-*-*-*-*-*-*-*-*-*-*-*", registry=5314561,
> script=5314561)
>     at xfont.c:466

Please set the breakpoint at xfont.c:414 with conditional:
  buf[1]=='-' && buf[2]=='-' && buf[3]=='-' && buf[4]=='-'
(I think that is enough for matching with "--------0------")

When emacs stops at that breakpoint, execute the code one
line by one (by "n" command) until the line 466 (i.e. the
call of xfont_supported_scripts) while checking why none of
"if" conditions that leads to "continue" aren't satisfied.

---
Kenichi Handa
handa@m17n.org