This is the same error I was seeing with the 20080505 tree. 

It may not be an error in ftrace, but I will be testing a build of the kernel 
with the ftrace parts turned off.

.config for the kernel is attached - dmesg from failed boots is not available 
(neither qemu or bochs supports x86-64, apparently and netconsole is beyond 
what I have available hardware-wise ATM.)

DRH

-- 
Dialup is like pissing through a pipette. Slow and excruciatingly painful.