possibly outdated info in pg_stat_activity

Hi,

PID 3533 does not exists in the system but its still in pg_stat_activity.
This is PostgreSQL 8.0.3 on i686-pc-linux-gnu, compiled by GCC gcc
(GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-49). Not sure if its already
known issue , advance apologies if
so.

tradein_clients=# SELECT procpid,query_start,
substring(btrim(current_query),0,50) from pg_stat_activity order by
query_start limit 20;
+---------+----------------------------------+---------------------------------------------------+
| procpid | query_start |
substring |
+---------+----------------------------------+---------------------------------------------------+
| 3533 | 2005-10-16 22:26:21.981728+05:30 | select
prod_serv,memb_affil,eyp,pacode,estd,entry |
| 3649 | 2005-10-16 22:26:33.168702+05:30 | <IDLE> in transaction
|
| 31579 | 2005-10-17 10:19:21.185764+05:30 | <IDLE>
|
| 32142 | 2005-10-17 10:21:46.696032+05:30 | <IDLE>
|
| 31715 | 2005-10-17 10:21:57.676293+05:30 | <IDLE>
|
| 3508 | 2005-10-17 10:22:12.500686+05:30 | <IDLE>
|
| 830 | 2005-10-17 10:23:04.34449+05:30 | <IDLE>
|
| 32197 | 2005-10-17 10:23:05.458473+05:30 | <IDLE>
|
| 31210 | 2005-10-17 10:23:20.55451+05:30 | <IDLE>
|
| 751 | 2005-10-17 10:24:33.519166+05:30 | <IDLE>
|
| 31908 | 2005-10-17 10:24:51.839088+05:30 | <IDLE>
|
| 31651 | 2005-10-17 10:24:53.896042+05:30 | <IDLE>
|
| 8777 | 2005-10-17 10:24:54.074668+05:30 | <IDLE>
|
| 31338 | 2005-10-17 10:25:28.248292+05:30 | <IDLE>
|
| 7547 | 2005-10-17 10:25:36.473533+05:30 | <IDLE>
|
| 10387 | 2005-10-17 10:26:00.250297+05:30 | <IDLE>
|
| 1399 | 2005-10-17 10:26:02.775205+05:30 | <IDLE>
|
| 867 | 2005-10-17 10:26:13.393084+05:30 | <IDLE>
|
| 10543 | 2005-10-17 10:26:14.258694+05:30 | <IDLE>
|
| 8680 | 2005-10-17 10:26:19.020959+05:30 | <IDLE>
|
+---------+----------------------------------+---------------------------------------------------+
(20 rows)