Rachita Kothiyal wrote: I could never get it to work, except "sort-of" on alpha. But even on alpha, it would only go back as far as the first kernel exception frame, and then would go off into the weeds. I don't know anything about the ppc64 -- you can ask Haren about that... As I recall, there was a whole bunch of user environment stuff that needed to be faked/replicated for it to even come close to working correctly, i.e., stuff that gdb would be gathering when running on a user process. Dave