Infinite loop crashes server

hi all,
i am using PostgreSQL 7.3.2 on redhat linux 9.
there is problem when executing pl/pg sql functions.
if the function enter an infinite loop. the server is hanged.
cannot cancel the query.
the linux itself is hanged.i cannot kill postgres process.
i have to reboot the machine manually..
waited for a long time for completion. but no result .
when ever there is an infinite loop happened
the system have to be restarted. unfortunately it happened many time
during development of the pl/pg sql function.
is it a bug in postgres. or is it configuration problem?
when the system is hanged disk access is 100%. the harddisk read indicator does not stop.

is there a solution for this problem..
pls help
regards
jinujose

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