I-search backward broken under MacOS 10.3 in Nov/1/03 CVS version

[Stephen McCracken]

Here are some console messages, though I presume that this bug should be
easy to reproduce.  The first time I try C-r, cpu usage jumps to 100% for a
while, and then emacs crashes.

/Users/steve % 
/pkg/stow/emacs-21-cvs-2003-11-1/Emacs.app/Contents/MacOS/Emacs &
[1] 11058
/Users/steve % *** malloc[11058]: Deallocation of a pointer not malloced:
0x136d580; This could be a double free(), or free() called with the middle
of an allocated block; Try setting environment variable MallocHelp to see
tools to help debug
*** malloc[11058]: Deallocation of a pointer not malloced: 0x136d580; This
could be a double free(), or free() called with the middle of an allocated
block; Try setting environment variable MallocHelp to see tools to help
debug
*** malloc[11058]: error for object 0x136d4c0: Double free
*** malloc[11058]: Deallocation of a pointer not malloced: 0x13a0000; This
could be a double free(), or free() called with the middle of an allocated
block; Try setting environment variable MallocHelp to see tools to help
debug
*** malloc[11058]: Deallocation of a pointer not malloced: 0x136d580; This
could be a double free(), or free() called with the middle of an allocated
block; Try setting environment variable MallocHelp to see tools to help
debug
*** malloc[11058]: error for object 0x136d4c0: Double free
*** malloc[11058]: error for object 0x136d0f0: Incorrect checksum for freed
object - object was probably modified after being freed; break at
szone_error

[1]    Segmentation fault
/pkg/stow/emacs-21-cvs-2003-11-1/Emacs.app/Contents/MacOS/Emacs
/Users/steve % 
/pkg/stow/emacs-21-cvs-2003-11-1/Emacs.app/Contents/MacOS/Emacs --version
GNU Emacs 21.3.50.1
Copyright (C) 2002 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.