Bug #16351 DD: Invaild Table Space locked in memory

Description:
Consider the following test case:

mysql> CREATE LOGFILE GROUP lg1 ADD UNDOFILE 'undofile.dat' INITIAL_SIZE 16M UNDO_BUFFER_SIZE = 1M ENGINE=NDB;
Query OK, 0 rows affected (1.65 sec)

mysql> CREATE TABLESPACE ts2 ADD DATAFILE 'datafile.dat' USE LOGFILE GROUP lg1 INITIAL_SIZE 12M ENGINE NDB;
Query OK, 0 rows affected (1.72 sec)

mysql> create database mysqltest;
Query OK, 1 row affected (0.00 sec)

mysql> CREATE TABLE mysqltest.t1 (c1 INT, c2 DOUBLE, c3 FLOAT, c4 TIMESTAMP, c5 TEXT, c6 LONGBLOB, c7 CHAR, c8 MEDIUMINT AUTO_INCREMENT, c9 BIT(8), c10 DECIMAL(10,2), c11 char(10), c12 VARCHAR(150), PRIMARY KEY (c8)) TABLESPACE ts2 STORAGE DISK ENGINE=NDB;
Query OK, 0 rows affected (1.04 sec)

mysql> drop tablespace ts2 engine = ndb;
ERROR 1503 (HY000): Failed to drop TABLESPACE

mysql> alter tablespace ts2 drop datafile 'datafile.dat' engine = ndb;
Query OK, 0 rows affected (0.14 sec)

mysql> drop tablespace ts2 engine = ndb;
ERROR 1503 (HY000): Failed to drop TABLESPACE
mysql> CREATE TABLESPACE ts2 ADD DATAFILE 'datafile.dat' USE LOGFILE GROUP lg1 INITIAL_SIZE 12M ENGINE NDB; ERROR 1502 (HY000): Failed to create TABLESPACE

*** 
So now it won't let me drop the table space . But if we look at the file system we see that the file is gone.

/space/run/ndb_4_fs> ls
D1  D10  D11  D2  D8  D9  LCP  undofile.dat
/space/run/ndb_5_fs> ls
D1  D10  D11  D2  D8  D9  LCP  undofile.dat

And I can still drop my table (GOOD)

mysql> use mysqltest
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+---------------------+
| Tables_in_mysqltest |
+---------------------+
| t1                  |
+---------------------+
1 row in set (0.01 sec)

mysql> drop table t1;
Query OK, 0 rows affected (0.69 sec)

But I still can not drop the table space:

mysql> drop tablespace ts2 engine = ndb;
ERROR 1503 (HY000): Failed to drop TABLESPACE

Yet if I restart the whole cluster, then it will allow the drop.

mysql> drop tablespace ts2 engine = ndb; Query OK, 0 rows affected (0.13 sec)

How to repeat:
See Above

Suggested fix:
Should not have to restart cluster to drop invalid Table Space.

All but the very last "drop tablespace" should fail.
You cant drop a tablespace that has datafiles using it, or tables using it.

BUT...I cant reproduce the error...it works like a charm for me...
Can you make a mysqltest script?