question about debugging haskell/C using ffi
Manuel M. T. Chakravarty
chak at cse.unsw.edu.au
Thu Nov 9 02:18:19 EST 2000
Axel Krauth <krauth at infosun.fmi.uni-passau.de> wrote,
> at the moment I'm writing a haskell/C programm using the FFI. But I'm
> getting always a segfault in the haskell part (according to gdb) .
> With Linux the segfault happens at random (while I'm doing a lot of calls
> to haskell via a dynamically exported function). With Unix gdb says it
> occurs in 'StgReturn' called from 'stg_returnToStackTop' after the C part
> finishes it job.
> I already put a C frontend instead of the haskell part and
> searched for access violations and other memory missmanagement in the C
> part (none). I also disabled (with no effect) all finalizers of the
> ForeignObj's used.
> As I'm relatively new to Haskell I don't know how to hunt that one down.
> Unfortunately the programm is already huge (ca. 4000 LOC Haskell & C) so
> the buggy part of the programm is not obvious (for me).
> Could someone give me a hint/technique how to approach the problem?
As SimonM already said, there is *unfortunately* not much in
the way of real support for hunting down such bugs. Did you
try linking with Electric Fence (see `man efence' on your
Linux box)? This may force the bug to occur earlier, which
might make it easier to track down. Are you using the
More information about the FFI