ipactl start fails with the error "waiting for processes to exit"

Issue

• ipactl start fails after a yum update of ipa packages from the previous version.
• start fails at "pki-ca" component

 ipactl start
Starting Directory Service
Starting dirsrv:
    HIW-COM...                                             [  OK  ]
    PKI-IPA...                                             [  OK  ]
Starting KDC Service
Starting Kerberos 5 KDC:                                   [  OK  ]
Starting KPASSWD Service
Starting Kerberos 5 Admin Server:                          [  OK  ]
Starting MEMCACHE Service
Starting ipa_memcached:                                    [  OK  ]
Starting HTTP Service
Starting httpd:                                            [  OK  ]
Starting CA Service
Starting pki-ca:                                           [  OK  ]
Failed to start CA Service
Shutting down
Stopping Kerberos 5 KDC:                                   [  OK  ]
Stopping Kerberos 5 Admin Server:                          [  OK  ]
Stopping ipa_memcached:                                    [  OK  ]
Stopping httpd:                                            [  OK  ]
Stopping pki-ca: waiting for processes 18436 to exit
                                                           [FAILED]         ---> Point of failure
Shutting down dirsrv:
    HIW-COM...                                             [  OK  ]
    PKI-IPA...                                             [  OK  ]
Aborting ipactl