Question about debugging nfs(network file system) module in user mode linux.

Hi, I have setup the user mode linux kernel with the help of one video tutorial in youtube i.e.http://www.youtube.com/watch?v=I6n9id4qnN4. Now i am able to debug kernel function sys_clone but my actual requirement is to debug nfs module in kernel. How to setup nfs in user mode linux and debug the nfs module. when from the symbol table I give as breakpoint one of the functions from nfs module, the break point is never reached. Thanks in Advance, Siva Kumar.