Anyone tried SystemTap with the latest RHEL5 Beta refresh

[Vara Prasad]

One of my colleague tried SystemTap on x86_64 machine got the following 
error
stap -g ioblock.stp
while: registering probe alias ioblock.submit = 
kernel.function("submit_bio")
semantic error: duplicate probe point pattern
while: registering probe alias ioblock.end = kernel.function("bio_endio")
semantic error: duplicate probe point pattern
Pass 2: analysis failed.  Try again with more '-v' (verbose) options.


I dont have the setup to debug his problem, was wondering if anyone has 
experienced these problems.
He is using stock RHEL 5 setup. I thought we now bundle everything 
needed in RHEL5, correct.
Does he needs to download any additional packages?

Thanks for your help,
Vara Prasad