After a reboot, multipath does not automatically add all the paths to multipath device

Issue

• After a reboot, multipath does not automatically add all the paths to multipath device

• multipath devices are not fully assembled after a reboot, some paths are skipped randomly.
  e.g. after system reboot below multipath device shows only one path while it has one more path:

  mpatha (3600a0999999992222222222999999992) dm-0 NETAPP  ,LUN C-Mode      
  size=16G features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle' hwhandler='1 alua' wp=rw
  `-+- policy='service-time 0' prio=50 status=active
    `- 2:0:0:2 sdg 8:96  active ready running
  

  This issue occurs only when multipath is configured to blacklist all the wwids and accept only specific devices mentioned in blacklist_exceptions:

  e.g.
  $ less /etc/multipath.conf
  blacklist {
          wwid    "*"
  }
  
  # blacklist exceptions
  blacklist_exceptions {
          wwid    "3600a0999999992222222222999999991"
          wwid    "3600a0999999992222222222999999992"
  }
  [...]