There is always two zombie process in my system.I don't kill them.Is there the same problem in your system. PID TTY STAT TIME COMMAND 2444 ? Z 0:00 [Xsession] <defunct> 2551 ? Z 0:00 [netstat] <defunct> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20070419/9ad527a0/attachment-0004.html>