Stale entries in pg_stat_activity

PostgreSQL 8.0.0beta3 (CVS)
Solaris 9

pg_stat_activity sometimes shows old connections that have already
terminated.  I've been able to reproduce this somewhat consistently
by doing the following:

createdb test
pgbench -i test
sudo /etc/init.d/postgresql restart
pgbench -S -c 30 -t 20 test
psql -c 'SELECT * from pg_stat_activity'

(Sorry for the long lines, but on a wide terminal the output is
easier to read than if I had used -x to enable expanded output.)

 datid | datname | procpid | usesysid | usename  |                  current_query                  |
query_start          

-------+---------+---------+----------+----------+-------------------------------------------------+-------------------------------
 38894 | test    |   28497 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:17.247942-06
 38894 | test    |   28494 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:17.247759-06
 38894 | test    |   28487 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:16.185687-06
 38894 | test    |   28481 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:17.120745-06
 38894 | test    |   28479 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:16.185514-06
 38894 | test    |   28477 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:17.119938-06
 38894 | test    |   28470 |        1 | postgres | select abalance from accounts where aid = 32673 | 2004-10-16
20:40:17.248236-06
 38894 | test    |   28462 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:16.200115-06
 38894 | test    |   28463 |        1 | postgres | <IDLE>                                          | 2004-10-16
20:40:17.248175-06
(9 rows)

This is a test box with no other activity.  ps shows that the listed
processes don't exist and netstat shows no open TCP or Unix socket
connections to the database.  Before running pgbench I restart the
backend to be sure it has a clean slate.  The number of rows varies
from test to test -- sometimes there are none and I've seen as many
as 19 with the pgbench options shown.  Sometimes current_query shows
<IDLE> for all connections and sometimes it shows a query for some
or all of them.

Any ideas?

--
Michael Fuhr
http://www.fuhr.org/~mfuhr/