bug#2009: 23.0.60; ido-mode freezes/deadlocks when jumping to root

[me@rpatterson.net]

I'm running emacs-snapshot from
https://launchpad.net/~ubuntu-elisp/+archive under ubuntu intrepid.  I
have ido-mode enabled for both buffer and file dialogs and I also have
ido-everywhere enabled.

Recently, emacs started freezing whenever I used ido to jump to root,
"/".  This is a full freeze, not even "C-g C-g C-g" will do anything.  I
have to "kill -9".  It happens no matter how I get to root, whether by
typing two slashes or by hitting backspace to get back up to root.  It
doesn't happen if I hit C-f to get out of ido and then hit slash twice
of delete the path up to root at which point everything works fine
including TAB completion.  I've disabled tramp and the problem still
happens.


In GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.14.4)
 of 2008-12-05 on iridium, modified by Debian
 (emacs-snapshot package, version 1:20081205-1)
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
configured using `configure  '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.60/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.60/site-lisp:/usr/share/emacs/site-lisp' '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  csv-field-index-mode: t
  shell-dirtrack-mode: t
  show-paren-mode: t
  server-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-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 input:
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> q <up> 
<up> <up> <up> <up> <return> q q M-< l g <down> <down> 
<down> <down> <down> <down> <up> <return> C-x 1 Z n 
y q M-> <return> Q y M-< l <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <return> <return> 
q <switch-frame> <switch-frame> <switch-frame> C-x 
b s e c <return> C-x o C-x b a r t <return> C-x o C-x 
o M-% <return> M-< M-% <return> C-x o M-< M-% <return> 
<switch-frame> <switch-frame> C-x b s h e <return> 
C-x M-s s <switch-frame> <down> <down> <return> <switch-frame> 
q <up> <up> <up> <up> <up> <up> <up> <up> <return> 
<down> <down> <down> <down> <down> <down> d <down> 
d <down> d <down> <return> <up> <up> <up> <up> <return> 
d <down> <down> <down> <down> <return> q <switch-frame> 
C-x o C-x b s t a t <return> _ <down> X C-g C-x o M-r 
m i g r a t i o n <return> <return> <switch-frame> 
<switch-frame> <switch-frame> <return> Z n y Z N Z 
N <switch-frame> <switch-frame> M-u <return> N N Z 
n y q <switch-frame> <switch-frame> <return> Z n C-g 
<return> Z N <switch-frame> <switch-frame> Z N Z N 
M-u Z n y Z N <switch-frame> <switch-frame> M-u Z n 
y <switch-frame> <switch-frame> Z N <return> <switch-frame> 
<switch-frame> q <up> <up> <down> <down> <return> q 
<return> c y l <return> <switch-frame> <switch-frame> 
Q y <switch-frame> M-x e m a C-g <switch-frame> <up> 
<up> <up> <up> <up> <up> <up> <down> <down> <down> 
<down> <down> <up> <down> <return> <return> M-x e m 
a <tab> r e p <tab> <M-backspace> <M-backspace> r e 
p o <tab> r <tab> b <tab> <return>

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