What do the messages 'multipathd: sdX: spurious uevent, path already in pathvec' mean?

Issue

• Following messages can be seen in the logs

  Jun  6 18:53:41 hostname multipathd: sdX: add path (uevent)
  Jun  6 18:53:41 hostname multipathd: sdX: spurious uevent, path already in pathvec
  Jun  6 18:53:41 hostname multipathd: mpathY: failed in domap for addition of new path sdX
  ...
  Jun  6 18:53:41 hostname multipathd: mpathY: failed in domap for addition of new         path sdX
  Jun  6 18:53:41 hostname multipathd: mpathY: uev_add_path sleep
  Jun  6 18:53:41 hostname kernel: device-mapper: table: 253:0: multipath: error getting device
  Jun  6 18:53:42 hostname kernel: device-mapper: table: 253:0: multipath: error getting device
  Jun  6 18:53:42 hostname multipathd: mpathY: failed in domap for addition of new path sdX
  Jun  6 18:53:42 hostname multipathd: mpathY: uev_add_path sleep