IS 46 goes down when trying to execute BAPI using INVOKE sapmapoutbound

I am trying to execute BAPI with (detailrecordList,trailerRecordList as input), the IS server is going down without any reason. I don’t see any thing in server or error log. Can any body know about this problem.

I would like to give some more information regarding this, I tried to test SAP function module from IS ADMIN, select SAP server–>input function module and click on TestFunction, the server is not responding for some time and then server is going down with core dump. Can any body know about this type of problem. We have applied all fix packs and service packs.