Just having some mental blocks on dtrace. Specifically, we now
create a kernel .ctf file - but looks like this is missing something we
need, despite putting in the bufinfo_t structure in to the stubs file.
Without that, we cannot invoke args[n] because dtrace doesnt know
how to convert the struct.
Hopefully wont take too long to figure out what is going on, and
then I can do another release.