zfs discuss - Dec 2008 - Snapshot manager service dependency error

I got this in the file system-filesystem-zfs-auto-snapshot:daily.log:
...
[ Dez 28 23:13:44 Enabled. ]
[ Dez 28 23:13:53 Executing start method
("/lib/svc/method/zfs-auto-snapshot start"). ]
Checking for non-recursive missed // snapshots  rpool
Checking for recursive missed // snapshots home rpool/firefox rpool/ROOT
Last snapshot for svc:/system/filesystem/zfs/auto-snapshot:daily taken on So Dez
14  0:36 2008
which was greater than the 1 days schedule. Taking snapshot now.
cannot create snapshot ''home/export/home/saf at
zfs-auto-snap:daily-2008-12-28-23:13'': dataset is busy
no snapshots were created
Error: Unable to take recursive snapshots of home at
zfs-auto-snap:daily-2008-12-28-23:13.
Moving service svc:/system/filesystem/zfs/auto-snapshot:daily to maintenance
mode.
cannot create snapshot ''rpool/ROOT/opensolaris at
zfs-auto-snap:daily-2008-12-28-23:13'': dataset is busy
no snapshots were created
Error: Unable to take recursive snapshots of rpool/ROOT at
zfs-auto-snap:daily-2008-12-28-23:13.
Moving service svc:/system/filesystem/zfs/auto-snapshot:daily to maintenance
mode.
[ Dez 28 23:13:59 Method "start" exited with status 0. ]
[ Dez 28 23:13:59 Stopping for maintenance due to administrative_request. ]
[ Dez 28 23:13:59 Executing stop method ("/lib/svc/method/zfs-auto-snapshot
stop"). ]
[ Dez 28 23:13:59 Method "stop" exited with status 0. ]
[ Dez 28 23:13:59 Stopping for maintenance due to administrative_request. ]
[ Dez 28 23:13:59 Stopping for maintenance due to administrative_request. ]
[ Dez 28 23:13:59 Stopping for maintenance due to administrative_request. ]

What does it mean: "dataset is busy"? How is this possible?
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