The following bug, has hit many people:
https://bugzilla.redhat.com/show_bug.cgi?id=492459
I saw a kernel oops again:
http://www.kerneloops.org/submitresult.php?email=olivares14031%40yahoo.com&number=324921
The other machine crashed on me and had to manually poweroff in order to try and update it!
Regards,
Antonio