bug#236: 23.0.60; using calc freezes emacs

[Jakob Krainz]

hello.

I got emacs to freeze using calc.

this bug seems easy to reproduce:

M-x calc
2
3
4
5
C-p
C-p
C-k
C-y

emacs stops reacting.

from #emacs @freenode
10:21 < jabot> if you want to try and reproduce:
10:21 < jabot> start calc
10:21 < jabot> enter some numbers
10:22 < jabot> kill one from the middle
10:22 < jabot> and then try to yank it
10:22 < twb> kill with C-k ?
10:22 < jabot> yes
10:22 < twb> Yes, I can duplicate this freeze with GNU Emacs 23.0.60.1 
(i486-pc-linux-gnu, GTK+ Version 2.12.9) of 2008-05-11 on
             elegiac, modified by Debian
10:23 < twb> tdoq gives an empty backtrace
10:23 < twb> During the freeze, emacs uses 100% of the CPU

feel free to ask me for more information.

mfg
        jakob

In GNU Emacs 23.0.60.1 (i386-unknown-freebsd7.0)
 of 2008-05-13 on ente.hawo.stw.uni-erlangen.de
configured using `configure  '--with-x-toolkit=no' '--without-x' 
'--prefix=/home/jakob/emacs' '--enable-asserts' 'CFLAGS=-O -pipe  -g' 
'LDFLAGS=-L/usr/pkg/lib' 'CPPFLAGS=-I/usr/pkg/include''

Important settings:
  value of $LC_ALL: de_DE.UTF-8
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: de_DE.ISO8859-15
  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.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  show-paren-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
("/home/jakob/emacs/bin/emacs" "-eval" "(global-set-key \"\\C-x\\C-c\" nil)")
Loading /home/jakob/.emacs.d/emacs-custom-jakob.el (source)...done
Loading /home/jakob/.emacs.d/custom.el (source)...done
Loading /home/jakob/.emacs.d/init.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Composing main Info directory...done
call-interactively: End of buffer
Making completion list... [2 times]