How to trigger ORA-00600,ORA-7445 by manual

Sometime we'd like to trigger ORA-00600/7445 internal errors for testing purpose, But it's not easy if you don't know a little trick like below:

declare
a exception;
pragma exception_init(a,-600);
begin
raise a;
end;

declare
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [], [], [], [], [], [], [], [], [],
[], [], []
ORA-06512: at line 5

or
oradebug unit_test dbke_test dde_flow_kge_ora ouch! 0 0

7445:
select spidfrom v$processp, v$sessions
where p.addr= paddr
and sid= sys_context('USERENV','SID');

kill -SEGV $PID

or

declare
a exception;
pragma exception_init(a,-7445);
begin
raise a;
end;