Hello.

CONFIG_TRAP_BAD_SYSCALL_EXITS forgets to do
GET_THREAD_INFO(%ebp) before accessing the
TI_preempt_count(%ebp). This leads to an
accesses to the random addresses and kills
the machine. Also "int $3" does nothing good
by itself (it would just Oops AFAICS). And
it is misplaced, too. Obviously it never worked.

The attached patch moves the check to the
right place (to the syscall_exit path) and
replaces the "int $3" by the call to the
helper function that only prints some debug
info and doesn't crash the system.
This fully solves the reported problem.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>