BUG #3773: psql segfault on exit

The following bug has been logged online:

Bug reference:      3773
Logged by:          guillaume 'ioguix' de Rorthais
Email address:      ioguix@free.fr
PostgreSQL version: 8.3 beta3
Operating system:   macosx 10.4.10
Description:        psql segfault on exit
Details:

I just maked/make installed pg8.3b3 from cvs.

Here is a copy of the segfault with the psql and backend versions :
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~)-(Thu 22/Nov/07 18:30)
(ioguixigx@igix:p3:%)- /sw/opt/pg83//bin/psql --version
psql (PostgreSQL) 8.3beta3
contains support for command-line editing

(~)-(Thu 22/Nov/07 18:30)
(ioguixigx@igix:p3:%)- /sw/opt/pg83//bin/psql -U postgres -p 5433 pagila
Password for user postgres:
Welcome to psql 8.3beta3, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

pagila=# select version();
                                                                  version

----------------------------------------------------------------------------
----------------------------------------------------------------
 PostgreSQL 8.3beta3 on i386-apple-darwin8.10.1, compiled by GCC
i686-apple-darwin8-gcc-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc. build 5367)
(1 row)

pagila=# \q
psql(26486) malloc: *** error for object 0x1806200: incorrect checksum for
freed object - object was probably modified after being freed, break at
szone_error to debug
psql(26486) malloc: *** set a breakpoint in szone_error to debug
zsh: segmentation fault  /sw/opt/pg83//bin/psql -U postgres -p 5433 pagila
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I don't know which other information I could add. Feel free to ask me for
some test/info.