backtrace not working on mainline x86_64

[Jose R. Santos]

Hi folks,

I've notice that on x86_64, the way in which we walk the stack has 
changed and this breaks backtrace() on mainline kernels.  There are a 
couple of dependencies that make coping the kernel's show_trace() 
function not very straight forward.  My hack seems to partially work but 
also crashes the system from time to time.  Has anyone experience this 
or have a fix available that would work with 2.6.16 kernels?

Thanks

-JRS