What CPU are you running on ? Did you move disks between two different machines by any chance ?

The machine is a dual athlon Mp. I previously installed fc5 devel and further updates on a vmware workstation virtual machine on this host. Then I dumped all files on a preformatted partition of this host. Then with chroot, grub setup, dev files creation, mkinitrd re-run and other conf file modifications I am able to boot natively in fc5. I expected kudzu to help doing this reconfiguration....

Do you get the same thing when you run it by hand from the command line ? If so, running it under gdb (with the kudzu-debuginfo package installed) should give you a backtrace of where the problem occured.

Yes it gives the same error. I'm going to install kudzu-debuginfo and let you know...

Thankls, Gianluca