bug#2434: 23.0.90; C-h h make emacs crash

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

emacs -Q -fn fontset-standard

and eval the following sexp:

(set-fontset-font
 "fontset-standard"
 'unicode
 '("Hiragino Maru Gothic Pro" . "iso10646-1"))

and C-h h make emacs crash.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/23.0.90/etc/DEBUG for instructions.

(gdb) bt full
#0  0x28d23a07 in kill () from /lib/libc.so.7
No symbol table info available.
#1  0x0811dfa4 in fatal_error_signal (sig=6) at emacs.c:403
No locals.
#2  <signal handler called>
No symbol table info available.
#3  0x28d23a07 in kill () from /lib/libc.so.7
No symbol table info available.
#4  0x0811c3db in abort () at emacs.c:432
No locals.
#5  0x081dbd5b in ftfont_get_metrics (font=Variable "font" is not available.
) at ftfont.c:1471
        ft_face = Variable "ft_face" is not available.
(gdb) xbacktrace
"font-shape-gstring" (0xbfbfbb84)

In GNU Emacs 23.0.90.1 (i386-unknown-freebsd7.1, GTK+ Version 2.14.7)
 of 2009-02-22 on sea.sakura.ad.jp
Windowing system distributor `Colin Harrison', version 11.0.70400002
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: ja_JP.eucJP
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: japanese-iso-8bit-unix
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  auto-insert-mode: t
  iswitchb-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC x g n <return> ESC x r e p o r <tab> e m <backspace> 
<backspace> <return>

Recent messages:
Loading /home/hirobo/.session...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Reading /home/hirobo/.newsrc.eld...
Reading active file via nnml...
nnml: Reading incoming mail from maildir...
nnml: Reading incoming mail (no new mail)...done
Reading active file via nnml...done
Generating the cache active file...done
No new newsgroups
Checking new news...done