crond problem?

[Hongwei Li]

Hi,

After running up2date to update many packages, my fc3 linux system log
shows a lot of messages:
...
Mar  4 10:20:01 pippo crond(pam_unix)[10178]: session opened for user root
by (uid=0)
Mar  4 10:20:01 pippo crond(pam_unix)[10178]: session closed for user root
Mar  4 10:30:01 pippo crond(pam_unix)[10181]: session opened for user root
by (uid=0)
Mar  4 10:30:01 pippo crond(pam_unix)[10181]: session closed for user root
Mar  4 10:40:01 pippo crond(pam_unix)[10184]: session opened for user root
by (uid=0)
Mar  4 10:40:01 pippo crond(pam_unix)[10184]: session closed for user root
Mar  4 10:50:01 pippo crond(pam_unix)[10187]: session opened for user root
by (uid=0)
Mar  4 10:50:01 pippo crond(pam_unix)[10187]: session closed for user root
...

What does that mean?  What's wrong and how to fix it?

Thanks for any help!

Hongwei Li