cbepctl command get stucks during stop persistence cmd execution

[root@node4-cb601-centos7 ~]# /opt/couchbase/bin/cbepctl localhost:11210 -u Administrator -p password -b default stop

^CTraceback (most recent call last):

  File "/opt/couchbase/lib/python/cbepctl", line 310, in <module>

    c.execute()

  File "/opt/couchbase/lib/python/clitool.py", line 71, in execute

    f[0](mc, *args[2:], **opts.__dict__)

  File "/opt/couchbase/lib/python/cli_auth_utils.py", line 92, in g

    f(*args, **kwargs)

  File "/opt/couchbase/lib/python/cbepctl", line 81, in stop

    time.sleep(0.5)

KeyboardInterrupt

[root@node4-cb601-centos7 ~]# /opt/couchbase/bin/cbepctl localhost:11210 -u Administrator -p password -b default start

Persistence started

[root@node4-cb601-centos7 ~]#