Sleep defunct

Pavan Kumar Purohit <[email protected]> Thu, 30 Jan 2003 10:20:45 +0530 (GMT+05:30)

Newsgroups	gmane.comp.gnu.sh-utils.bugs
Message-ID	<[email protected]>

Hello,
I have used 'sleep' in a C shell script. This script in turn executes a
program. sleep is used to give delay between execution of the program in
the script.
Every 2-3 hours the sleep becomes defunct (see below)
root    21624  0.0  0.0     0    0 pts/4    Z    01:02   0:00 [sleep <defunct>]
root    21623  0.0  0.0  1308    4 pts/4    T    01:02   0:00 sleep 180

As a result the program is not executed.
Do u suggest anything.
regards
pavan