/var/log messages question

Thank you for reading this.

The following is being written to the /var/log/messages file twice every 
second.

Jan 28 11:47:17 localhost kernel: VFS: busy inodes on changed media or resized 
disk sr0

This has only occurred since a fresh installation of 2010.2 and it seems to 
occur after I have connected to the Internet and so I suspect it has something 
to do with the fetched update list. If I disconnect and then reboot the 
message doesn't seem to reappear until the next time that I connect to the 
Internet. Beyond that I don't have much of an idea of how to prevent this.

Can anyone offer a suggestion?

-- 
Regards,
Phil