LKM Trojan?

I just installed a fresh copy of centos 4.5, updated some programs and installed chkrootkit. When i run # ./chkproc, it shows the following output:

# ./chkproc
You have 14 process hidden for readdir command
You have 14 process hidden for ps command

Searching for LKM trojans shows the following output:
# ./chkrootkit -x lkm

EXE 9994: /usr/sbin/named
CWD 9995: /var/named
EXE 9995: /usr/sbin/named
CWD 9996: /var/named
EXE 9996: /usr/sbin/named
CWD 9997: /var/named
EXE 9997: /usr/sbin/named
CWD 9998: /var/named
EXE 9998: /usr/sbin/named
CWD 26293: /var/lib/mysql
EXE 26293: /usr/sbin/mysqld
CWD 26294: /var/lib/mysql
EXE 26294: /usr/sbin/mysqld
CWD 26295: /var/lib/mysql
EXE 26295: /usr/sbin/mysqld
CWD 26296: /var/lib/mysql
EXE 26296: /usr/sbin/mysqld
CWD 26297: /var/lib/mysql
EXE 26297: /usr/sbin/mysqld
CWD 26298: /var/lib/mysql
EXE 26298: /usr/sbin/mysqld
CWD 26299: /var/lib/mysql
EXE 26299: /usr/sbin/mysqld
CWD 26300: /var/lib/mysql
EXE 26300: /usr/sbin/mysqld

When i stop mysql and named, and run # ./chkrootkit -x lkm again, it doesn't show anything. When i turn mysql and named back on, it starts complaining about compromises again.

Can it be a false alarm, or should i really be worried? What do you advise me to do now?