Ediff crashes GTK+ version of Emacs under X

[Sven Joachim]

Running ediff reprodrucibly crashes the GTK+-enabled version of Emacs
under X. Simply try "M-x ediff-files" or "M-x ediff-buffers" and the
Emacs window disappears as soon as ediff starts. Or try the command

emacs -Q -D --eval '(ediff-files "/etc/passwd" "/etc/group")'

in a terminal, which should reproduce the bug and crash with a
segmentation fault. Emacs built with the Lucid toolkit is not affected
by this bug, nor does it occur if Emacs is run with the "-nw" option
in a text terminal.

My Emacs version:

 GNU Emacs 22.0.50.1 (i386-pc-linux-gnu, GTK+ Version 2.6.4)
 of 2005-08-15 on debian, modified by Debian
X server distributor `The XFree86 Project, Inc', version 11.0.40300001
configured using `configure '--build' 'i386-linux' '--host'
'i386-linux' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--with-gif'
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/22.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.0.50/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.0.50/leim'
'--with-x=yes' '--with-x-toolkit=gtk' 'CC=gcc-4.0' 'CFLAGS=-DDEBIAN -g
-Wno-pointer-sign -O2' 'build_alias=i386-linux'
'host_alias=i386-linux''