MySQL crashes during an ALTER TABLE

Hi,

MySQL is crashing when doing an ALTER TABLE on an existing innodb table with existing data

ALTER TABLE table
ENGINE=SPIDER CONNECTION='table "table", user "root"'
PARTITION BY LIST(id)
(PARTITION p0 values in (0, 3, 6) COMMENT = 'host "m0", port "3306"' ENGINE = SPIDER,
PARTITION p1 values in (1, 4, 7) COMMENT = 'host "m1", port "3306"' ENGINE = SPIDER,
PARTITION p2 values in (2, 5, 8) COMMENT = 'host "m2", port "3306"' ENGINE = SPIDER);

I get the following backtrace:

thd: 0x39d5abe0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7f0b4a520ea0 thread_stack 0x30000
/usr/bin/mysqld(my_print_stacktrace+0x24) [0x781404]
/usr/bin/mysqld(handle_segfault+0x35c) [0x5c478c]
/lib64/libpthread.so.0(+0xf5d0) [0x7f13f14365d0]
/usr/bin/mysqld(my_pthread_fastmutex_lock+0xd) [0x786b3d]
/usr/lib64/mysql/plugin/ha_spider.so(spider_db_show_table_status(ha_spider*, int, int)+0x394) [0x7f13ed58aca4]
/usr/lib64/mysql/plugin/ha_spider.so(spider_get_sts(st_spider_share*, int, long, ha_spider*, double, int, int, int)+0xd3) [0x7f13ed59f243]
/usr/lib64/mysql/plugin/ha_spider.so(ha_spider::info(unsigned int)+0x5bb) [0x7f13ed5b62db]
/usr/bin/mysqld(ha_partition::info(unsigned int)+0x121) [0x6a1501]
/usr/bin/mysqld(ha_partition::open(char const*, int, unsigned int)+0x3d1) [0x6a5051]
/usr/bin/mysqld(handler::ha_open(st_table*, char const*, int, int)+0x3f) [0x69c1cf]
/usr/bin/mysqld(open_table_from_share(THD*, st_table_share*, char const*, unsigned int, unsigned int, unsigned int, st_table*, bool)+0x56a) [0x60f33a]
/usr/bin/mysqld(open_temporary_table(THD*, char const*, char const*, char const*, bool)+0x196) [0x603a46]
/usr/bin/mysqld(mysql_alter_table(THD*, char*, char*, st_ha_create_information*, TABLE_LIST*, Alter_info*, unsigned int, st_order*, bool)+0x194d) [0x6b4e4d]
/usr/bin/mysqld(mysql_execute_command(THD*)+0xd6c) [0x5cfb8c]
/usr/bin/mysqld(mysql_parse(THD*, char const*, unsigned int, char const**)+0x217) [0x5d4757]
/usr/bin/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0x8f6) [0x5d60c6]
/usr/bin/mysqld(do_command(THD*)+0xe6) [0x5d6de6]
/usr/bin/mysqld(handle_one_connection+0x216) [0x5ca846]
/lib64/libpthread.so.0(+0x75f0) [0x7f13f142e5f0]
/lib64/libc.so.6(clone+0x6d) [0x7f13f03ce84d]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort...
thd->query at 0x7f0b3c004a50 is an invalid pointer
thd->thread_id=8
thd->killed=NOT_KILLED
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.