Debugging Haskell: the stack

Dear Haskell people, when I call from Haskell into C, stop it there, and use a debugger (e.g gdb) to look at the stack, it looks all broken. Here is an example: #0 c_init () at c.c:5 #1 0x08048f14 in ssM_fast1 () #2 0x0804a248 in sakt_ret () #3 0x04c58308 in ?? () (c_init is a C function on which I've set a breakpoint). Now, I don't expect to see meaningful stack frames from Haskell, but I am calling into Haskell from C, and I would expect the C functions calling into Haskell to appear on the stack frame. What is happening? How does Haskell manage to still return to C when the stack looks like that? Best regards, --C.