I upgrade from Fedora16 to Fedora 17 with preupgrade, and anything worked except that the system did not update my /boot/grub2/grub.cfg file at all, so the system booted fedora 17 with the fedora 16 kernel. This does work except that the system does a kernel panic when shutting down. My system is using raid1 on 2 disks but /boot is not using raid. Mount for /boot is: /dev/sda2 on /boot type ext2 (rw,relatime,seclabel,user_xattr,acl,barrier=1) And / (The only other filesystem I have) is mounted as /dev/md0 on / type ext4 (rw,relatime,seclabel,user_xattr,acl,barrier=1,data=ordered) A few more details available at http://superuser.com/questions/430293/fedora-17-keeps-using-fedora-16-kernel/430330#430330
Doing a grub2-mkconfig -o /boot/grub2/grub.cfg as root fixed the problem. So the system is now using the correct kernel.
*** This bug has been marked as a duplicate of bug 826537 ***