Bug in next-line-internal?

[Legacy, Allain [CAR:VC17:EXCH]]

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In GNU Emacs 21.3.1 (hppa2.0-hp-hpux10.20, X toolkit)
 of 2003-05-24 on wcarh0ne
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: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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

My key bindings show that my <down> key is bound to
next-line-nomark but whenever I press the <down> key I get
the following response:

next-line: Symbol's function definition is void:
next-line-internal

My <up> key is bound to previous-line-nomark and it is
working as expected.

Recent input:
<return> <return> <return> <up> <up> <down> <down>
<down> <help-echo> <help-echo> <menu-bar> <help-menu>
<report-emacs-bug>

Recent messages:

Loading time...done
Loading complete...done
Loading oomap...done
Loading hexmath...done
Loading xadec...done
For information about the GNU Project and its goals, type
M-x describe-project.
HP/xterm function keys are set.
next-line: Symbol's function definition is void:
next-line-internal [3 times]
Loading emacsbug...done