xfsdump failure - failed to get bulkstat information for root node

[Lars Soltau <l.soltau@xxxxxxx>]

I have installed SuSE 10.0 and created several XFS filesystems. I 
cannot, however, backup any of them with xfsdump, getting this error:

xfsdump: using file dump (drive_simple) strategy
xfsdump: version 2.2.30 (dump format 3.0) - Running single-threaded
xfsdump: unable to determine uuid of fs mounted at /: invalid argument
xfsdump: level 0 dump of numenor:/
xfsdump: dump date: Wed Feb 15 14:06:05 2006
xfsdump: session id: 44d3fcab-20d5-49ec-8b88-8810d0114472
xfsdump: session label: ""
xfsdump: ERROR: failed to get bulkstat information for root inode
xfsdump: Dump Status: ERROR

I booted the system from CD and checked all filesystems - xfscheck 
reports no errors. xfsadmin can read the UUID just fine. Any idea what 
might go wrong here?