IMO the problem is here:

=====   shell: CENTOS/30-mkinitrd   =====
ainsl: appending to /target/etc/fstab: proc     /proc   proc    defaults        
0 0
ainsl: appending to /target/etc/fstab: sysfs    /sys    sysfs   auto            
0 0
chroot: failed to run command `kudzu': No such file or directory
chroot: failed to run command `kudzu': No such file or directory
chroot: failed to run command `kudzu': No such file or directory
WARNING: generating initrd with list of drivers failed. Trying without.
CENTOS/30-mkinitrd   FAILED with exit code 1.


Since kudzu is not available, mkinitrd cannot find the drivers which
must be included into the initrd. I'm not sure if SLC6 is already
using dracut. If so, you may want to change the script 30-mkinitrd so
it uses the dracut part instead of the mkinitrd code. Or try to add
kudzu to your package list.

-- 
regards Thomas

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