[Haskell-cafe] how to debug stack overflow?

What is the recommended method to find the exact reason for a stack overflow (when running a Haskell program compiled with ghc)? When I compile with -prof -auto-all, and run with +RTS -xc, I see a very short call stack, which can't be right. But that's probably because I am calling some library method that was compiled without -auto-all so it's invisible in the trace? I can avoid the overflow by +RTS -K1G or something but I want to investigate because it might indicate some inefficiency in the code (evaluations happening at the wrong time). - J.W.