SELECT with ORDER BY causes "ERROR 1030 (HY000): Got error 122 from storage engine"

CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=LevelDB;

# Query OK, 0 rows affected (0.06 sec)

INSERT INTO t1 VALUES (2),(1);

# Query OK, 2 rows affected (0.01 sec)

# Records: 2  Duplicates: 0  Warnings: 0

SELECT * FROM t1 ORDER BY pk;

# ERROR 1030 (HY000): Got error 122 from storage engine

revision-id: psergey@askmonty.org-20121221152341-9stvnkuiinslrt9h

date: 2012-12-21 19:23:41 +0400

build-date: 2012-12-21 21:15:42 +0400

revno: 4471

branch: mysql-5.6-leveldb