I'm developing a program with GHC-6.6. I've been on amd64, and haven't had problems, but now when I run the program on on x86 (after cleaning and recompiling), I'm getting a segfault. gdb isn't very helpful at all: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1212873040 (LWP 26946)] 0x080b45b8 in s2EI_info () (gdb) bt #0 0x080b45b8 in s2EI_info () #1 0x081757a8 in ?? () #2 0x00000004 in ?? () #3 0xb7875278 in ?? () I am using some various bindings to some C libraries, some I have written and some written by others. But, I'm not able to figure out where to even begin looking for the problem. Any advice on how I might be able to better debug this? Would compiling unregistered help (I'll have to figure out how to build libraries for that)? Thanks, David Brown