C-p on second line in shell-mode moves to beginning of buffer

[Sven Joachim]

In shell-mode, when point is on the second line (no matter which
column), C-p (`previous-line') moves point to the beginning of the
buffer.  How comes that?

In GNU Emacs 22.0.50.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2005-09-30 on debian, modified by Debian
X server distributor `The X.Org Foundation', version 11.0.60802000


Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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: de_DE
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: Shell

Minor modes in effect:
  display-time-mode: t
  auto-image-file-mode: t
  show-paren-mode: t
  mouse-wheel-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  temp-buffer-resize-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
o <tab> <tab> <return> <help-echo> C-x o C-c c <left>
<left> <left> <left> <left> <left> <left> <left> <left>
<left> <left> <left> <left> <left> <left> <left> <left>
<left> <left> <left> <left> <backspace> <backspace>
<backspace> 2 . 9 5 <return> g <backspace> <down> M-p
<return> C-x C-j g D y e s <return> g <up> v q C-x
o C-x k <return> C-x k <return> C-x k <return> C-x
k <return> C-x k <return> <f5> C-x k <return> C-x d
~ <return> <f5> p w d <return> <up> <up> M-x r e p
<tab> o r t - e m <tab> <return>

Recent messages:
mouse-2, RET: describe this variable
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