zdb: dmu_bonus_hold(6516747) failed, errno 2

"When  operating  on  an imported and active pool it is possible, though unlikely, that zdb may interpret  inconsistent  pool  data  and  behave erratically."

sh-3.2$ sudo zdb -d gjp22 6516747
Dataset mos [META], ID 0, cr_txg 4, 340M, 11276 objects

    Object  lvl   iblk   dblk  dsize  lsize   %full  type
zdb: dmu_bonus_hold(6516747) failed, errno 2
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sh-3.2$ sudo zdb -dddd gjp22@2014-02-13-031721 6516747
Dataset gjp22@2014-02-13-031721 [ZPL], ID 19175, cr_txg 8905842, 236G, 5559300 objects, rootbp DVA[0]=<0:ffcb8d000:1000> DVA[1]=<0:447e0a9000:1000> [L0 DMU objset] fletcher4 lzjb LE contiguous unique double size=800L/200P birth=8905841L/8905841P fill=5559300 cksum=220df31be3:ac979fd71a3:1e2f835406d41:3ce218105d435d

    Object  lvl   iblk   dblk  dsize  lsize   %full  type
   6516747    3    16K   128K   233M   233M  100.00  ZFS plain file
                                        144   bonus  System attributes
	dnode flags: USED_BYTES USERUSED_ACCOUNTED
	dnode maxblkid: 1862
	path	/Downloads/misc/2014-02-12/ubuntu-13.10-desktop-amd64.iso.download/ubuntu-13.10-desktop-amd64.iso
	uid     19236
	gid     0
	atime	Wed Feb 12 17:02:00 2014
	mtime	Wed Feb 12 17:13:18 2014
	ctime	Wed Feb 12 17:13:18 2014
	crtime	Wed Feb 12 17:02:00 2014
	gen	8897726
	mode	100644
	size	244077518
	parent	6516744
	links	1
	pflags	0
	xattr	6516748

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sh-3.2$ ls -i ~/Downloads/misc/2014-02-12/ubuntu-13.10-desktop-amd64.iso.download/ubuntu-13.10-desktop-amd64.iso
6516747 /Users/gjp22/Downloads/misc/2014-02-12/ubuntu-13.10-desktop-amd64.iso.download/ubuntu-13.10-desktop-amd64.iso
sh-3.2$ zfs mount | grep /Users/gjp22
gjp22                           /Users/gjp22
sh-3.2$