Thread hang in 'Update' state on 2nd INSERT

INSTALL PLUGIN Spider SONAME 'ha_spider.so';

CREATE SERVER s FOREIGN DATA WRAPPER mysql OPTIONS(HOST '1');

CREATE TABLE t(c INT)ENGINE=Spider COMMENT='WRAPPER "mysql",SRV "s",TABLE "foo"';

INSERT INTO t VALUES(1);   # ERROR 1429 (HY000): Unable to connect to foreign data source: s

INSERT INTO t VALUES(1);   # Hangs

11.2.6-dbg>SHOW PROCESSLIST;

+----+-------------+-----------+------+---------+------+----------------------------------------------------+-------------------------+----------+

| Id | User        | Host      | db   | Command | Time | State                                              | Info                    | Progress |

+----+-------------+-----------+------+---------+------+----------------------------------------------------+-------------------------+----------+

|  4 | root        | localhost | test | Query   | 2003 | Update                                             | INSERT INTO t VALUES(1) |    0.000 |

|  5 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                    |    0.000 |

|  6 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                    |    0.000 |

|  9 | root        | localhost | test | Query   |    0 | starting                                           | SHOW PROCESSLIST        |    0.000 |

+----+-------------+-----------+------+---------+------+----------------------------------------------------+-------------------------+----------+

4 rows in set (0.000 sec)