Has this been already fixed or reported?

---------------------------------------------------------
Welcome to psql, the PostgreSQL interactive terminal.

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

Using pager is off.
test=# select version();
version
---------------------------------------------------------------------
PostgreSQL 7.1.1 on i686-pc-linux-gnu, compiled by GCC egcs-2.91.66
(1 row)

test=# \dz
Did not find any relation named "z".
test-# \dz
Did not find any relation named "z".
Segmentation fault (core dumped)
--
Tatsuo Ishii