C-g does not interrupt lisp code (emacs 21)

[Philippe Waroquiers]

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In GNU Emacs 21.1.1 (hppa1.1-hp-hpux11.00, X toolkit)
 of 2001-10-23 on rhino
configured using `configure  hppa1.1-hp-hpux11.00 --with-gcc=no --with-x11r6 
--x-libraries=/usr/lib/X11R6:/usr/contrib/X11R6/lib --with-x-toolkit=lucid 
--with-xpm --prefix=/opt/contrib/emacs --exec-prefix=/opt/contrib/emacs/21.1 
--mandir=/opt/contrib/man'
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: nil

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

start emacs with:
  emacs --no-init-file --no-site-file 
in *scratch* buffer type
  (while t) C-x C-e

Then try to interrupt this lisp with C-g.
This does not work. Emacs has to be killed.

The same action works fine with emacs 20.7.
 

-- 
Philippe WAROQUIERS                  Eurocontrol - Central Flow Management Unit
philippe.waroquiers@eurocontrol.int  Rue de la fusee, 96
Tel: +32 2 729 97 35                 1130 Brussels
Fax: +32 2 729 90 22                 Belgium