Then it's no longer OpenBSD which is the whole operating system,
the most you can say is it's using some parts from OpenBSD, so it's
not exactly on-topic here. You can do a lot more to track down the
problem yourself...
Some suggestions:
1. ktrace(1)/kdump(1)
2. gdb(1).
3. Compare one/both of the above with a working system.
4. Look at setusercontext(3), work out what might fail.