emacs loops after dabbrv-expand in (inviolable) minibuffer

[Klaus Zeitler]

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In GNU Emacs 21.1.1 (sparc-sun-solaris2.7, Motif Version 2.1.0)
 of 2001-12-14 on sfsw54
configured using `configure  --with-gcc 
--prefix=/vol/freeware/SunOS-5.7/emacs/21.1 
--sharedstatedir=/vol/freeware/SunOS-5.7/emacs/21.1/share 
--with-x-toolkit=motif --x-includes=/usr/openwin/include:/usr/local/gnu/include 
--x-libraries=/usr/openwin/lib:/usr/local/gnu/lib --with-pop'
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:

1. start emacs 21.1 with -q --no-site-file
2. customize-variable minibuffer-prompt-properties (set them to inviolable)
3. try a command that needs the minibuffer e.g. query-replace
4. enter a string and press M-/ (dabbrev-expand)
5. emacs loops but I can interrupt with C-g

BTW when I start emacs with my .emacs.el sometimes I can't even interrupt with
C-g after a dabbrev-expand command in minibuffer.

Recent input:
<escape> x c u s t o m i z e - v a SPC <return> m i 
n i b SPC p r SPC SPC <return> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <up> <help-echo> <help-echo> 
<help-echo> <help-echo> <down-mouse-2> <mouse-2> <help-echo> 
<help-echo> <help-echo> <help-echo> <down-mouse-2> 
<mouse-2> <help-echo> <escape> x q u e r y - r e p 
l <return> c u s t <escape> / <escape> / C-g <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <menu-bar> <help-menu> <report-emacs-b
ug>

Recent messages:
Creating customization items...
Creating customization items ...done
Creating customization setup...
Creating customization buffer...done
Loading dabbrev...done
dabbrev--abbrev-at-point: Quit
minibuffer-avoid-prompt: Quit
query-replace-read-args: Quit
Loading emacsbug...done
call-interactively: End of buffer