freebsd stable - Feb 2011 - harmless zfs warnings?

hi,
I have one disk, labeled r0 (/dev/mfid0), which i gpart'ed so:
=>        34  1952448445  mfid0  GPT  (931G)
          34         128      1  freebsd-boot  (64K)
         162     4194304      2  freebsd-ufs  (2.0G)
     4194466   100663296      3  freebsd-swap  (48G)
   104857762  1847590717      4  freebsd-zfs  (881G)

and a second 'disk' labeled r5 (/dev/mfid1).
now, doing a 'spool import':
  pool: z
    id: 7844246385999998804
 state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

        z             ONLINE
          gpt/r0/zfs  ONLINE

  pool: h
    id: 5366665400138652241
 state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

        h           ONLINE
          label/r5  ONLINE

what caught my attention was the following message on the console:
ZFS WARNING: Unable to attach to gpt/r0/swap.
ZFS WARNING: Unable to attach to mfid0p3.

should I realy get warried?

thanks,
	danny