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OK, built and installed all kinds of python packages with
the patch. All tests are fine. Here goes:

1. Your testcase goes just fine, no segfault with the
patched version.
2. Mine still segfaults.
3. I ran mine under gdb with python2.4-dbg package, here's
the output (printed "shurafine" is my addition, to make sure
that the correct code is being run):

$ gdb python2.4-dbg
GNU gdb 6.4-debian
Copyright 2005 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public
License, and you are
welcome to change it and/or distribute copies of it under
certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show
warranty" for details.
This GDB was configured as "i486-linux-gnu"...Using host
libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".

(gdb) run test2.py
Starting program: /usr/bin/python2.4-dbg test2.py
[Thread debugging using libthread_db enabled]
[New Thread -1210038592 (LWP 29629)]
shurafine

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1210038592 (LWP 29629)]
0xb7b57f3e in DB_associate (self=0xb7db9f58, args=0xb7dbd3b4,
    kwargs=0xb7db5e94) at
/home/shura/src/python2.4-2.4.2/Modules/_bsddb.c:1219
1219            Py_DECREF(self->associateCallback);
(gdb)

Please let me know if I can be of further assistance.