QA output created by 451

=== ilu ===
initialize
lock
unlock

=== ilululu ===
initialize
lock
unlock
lock
unlock
lock
unlock

=== illluluuluu ===
initialize
lock
lock
lock
unlock
lock
unlock
unlock
lock
unlock
unlock

=== ll ===
lock
lock

=== iluu ===
initialize
lock
unlock
unlock
exerlock.c:50: unlock failed: Operation not permitted
