emacs crashes on <up>

[Werner Reisbein]

note: since I don't want to see my real email in public this is mail
is sent by hand rather than automatically by emacs.

In GNU Emacs 21.4.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2007-06-19 on ninsei, modified by Debian
configured using `configure  '--build=i486-linux-gnu'
'--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var/lib'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--with-x=yes' '--with-x-toolkit=athena' 'build_alias=i486-linux-gnu'
'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2''
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

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

remove .emacs and .xmodmap
start emacs
load some text file
move cursor to anywhere below first line
press <up> (curor up key)
-> Fatal error (11).Segmentation fault

other cases:
press <down> -> ok.
press C-h k <up> -> prints:
   <up> runs the command previous-line
      which is an interactive compiled Lisp function in `simple'.
   (previous-line ARG)
   ...
run previous-line manually -> ok. prints:
   "You can run the command `previous-line' with C-p".
press C-p -> crash.
press <up> in very first line of file -> ok (beeps).
bind another key to previous-line (e.g. global-set-key [f1] 'previous-line)
   and press that key -> crash.
bind <up> to next-line -> ok.



Recent input:
see above

Recent messages (copied from *Messages* buffer by hand:
(emacs)
Loading disp-table...done
Loading tool-bar...done
Loading image...done
Loading tooltip...done
Loading 00debian-vars...done
Loading 50dictionaries-common (source)...
Loading debian-ispell...
Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...done
Loading debian-ispell...done
Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...done
Loading 50dictionaries-common (source)...done
Loading 50psvn (source)...done
For information about the GNU Project and its goals, type C-h C-p.