Ceph MDS sees empty dir as not empty, fails to rmdir.

2012-04-10 21:33:39.214794 7f49e847e700 mds.0.server dispatch_client_request client_request(client.6762:143120 rmdir #10000000003/queue) v1
2012-04-10 21:33:39.214799 7f49e847e700 mds.0.cache traverse: opening base ino 10000000003 snap head
2012-04-10 21:33:39.214804 7f49e847e700 mds.0.cache traverse: path seg depth 0 'queue' snapid head
2012-04-10 21:33:39.214808 7f49e847e700 mds.0.cache.dir(10000000003) lookup (head, 'queue')
2012-04-10 21:33:39.214813 7f49e847e700 mds.0.cache.dir(10000000003)   hit -> (queue,head)
2012-04-10 21:33:39.214819 7f49e847e700 mds.0.cache path_traverse finish on snapid head
2012-04-10 21:33:39.214829 7f49e847e700 mds.0.server handle_client_rmdir on [dentry #1/empty/nzbget/queue [2,head] auth (dn sync l=1) (dversion lock) pv=0 v=2486180 inode=0x121d780 | inodepin clientlease 0x5d8a918]
2012-04-10 21:33:39.214843 7f49e847e700 mds.0.server dn links to [inode 1000000023b [...2,head] /empty/nzbget/queue/ auth v2486176 f(v4 m2012-04-09 20:42:10.638933 26=26+0) n(v0 rc2012-04-09 20:42:10.638933 b381554 27=26+1) (inest lock) (iversion lock) caps={6762=pAsXsFs/-@16},l=6762 | caps 0x121d780]
2012-04-10 21:33:39.214859 7f49e847e700 mds.0.server dir_is_nonempty_unlocked [inode 1000000023b [...2,head] /empty/nzbget/queue/ auth v2486176 f(v4 m2012-04-09 20:42:10.638933 26=26+0) n(v0 rc2012-04-09 20:42:10.638933 b381554 27=26+1) (inest lock) (iversion lock) caps={6762=pAsXsFs/-@16},l=6762 | caps 0x121d780]
2012-04-10 21:33:39.214871 7f49e847e700 mds.0.server dir_is_nonempty_unlocked dirstat has 26 items [dir 1000000023b /empty/nzbget/queue/ [2,head] auth v=19941 cv=19941/19941 state=1073741826|complete f(v4 m2012-04-09 20:42:10.638933 26=26+0) n(v0 rc2012-04-09 20:42:10.638933 b381554 26=26+0) hs=0+0,ss=0+0 0xe0ea00]
2012-04-10 21:33:39.214879 7f49e847e700 mds.0.server reply_request -39 (Directory not empty) client_request(client.6762:143120 rmdir #10000000003/queue) v1
2012-04-10 21:33:39.214884 7f49e847e700 mds.0.server apply_allocated_inos 0 / [] / 0
2012-04-10 21:33:39.214891 7f49e847e700 mds.0.server lat 0.000531
2012-04-10 21:33:39.214900 7f49e847e700 mds.0.cache request_finish request(client.6762:143120 cr=0x3141000)
2012-04-10 21:33:39.214906 7f49e847e700 mds.0.cache request_cleanup request(client.6762:143120 cr=0x3141000)