Self explanatory:

$ redis-cli
redis 127.0.0.1:6379> auth mypassword
(error) BUSY Redis is busy running a script. You can only call SCRIPT KILL or SHUTDOWN NOSAVE.
redis 127.0.0.1:6379> shutdown nosave
(error) ERR operation not permitted
redis 127.0.0.1:6379> script kill
(error) ERR operation not permitted