Sample of spider_direct_sql cause crash

When running the sample code on page:https://mariadb.com/kb/en/library/spider-cluster-management/ . It seems that spider_direct_sql mostly cause a crash.

MariaDB [mysql]> CREATE TEMPORARY TABLE res (   id int(10) unsigned NOT NULL,   k int(10) unsigned NOT NULL DEFAULT '0',   c char(120) NOT NULL DEFAULT '',   pad char(60) NOT NULL DEFAULT '' ) ENGINE=MEMORY;

Query OK, 0 rows affected (0.000 sec)

MariaDB [mysql]> SELECT spider_direct_sql( 'SELECT * FROM sbtest s  WHERE s.id IN(10,12,13)',   'res',   concat('host "', host, '", port "', port, '", user "', username, '", password "', password, '", database "', tgt_db_name, '"') ) a FROM   mysql.spider_tables WHERE   db_name = 'backend' and table_name like 'sbtest#P#pt%';

ERROR 2013 (HY000): Lost connection to MySQL server during query

Stack dump looks like this:
180906 11:02:21 [ERROR] mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 10.3.9-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=1
max_threads=153
thread_count=27
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467396 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f2f38928408
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 = 0x7f2f14240d70 thread_stack 0x49000
mysys/stacktrace.c:270(my_print_stacktrace)[0x7f2f3531466e]
sql/signal_handler.cc:168(handle_fatal_signal)[0x7f2f34da4f37]
sigaction.c:0(__restore_rt)[0x7f2f341f4100]
:0(__strnlen_sse2)[0x7f2f327d2ec1]
include/m_ctype.h:1096(my_well_formed_length)[0x7f2f3535ce29]
strings/my_vsnprintf.c:627(my_vsnprintf_ex)[0x7f2f3535db3f]
mysys/my_error.c:154(my_printf_error)[0x7f2f3530b0b9]
spider/spd_direct_sql.cc:1709(spider_direct_sql_body(st_udf_init*, st_udf_args*, char*, char*, char))[0x7f2f2739b1b9]
sql/sql_udf.h:108(udf_handler::val_int(char*))[0x7f2f34e194de]
sql/sql_type.cc:5314(Type_handler::Item_send_longlong(Item*, Protocol*, st_value*) const)[0x7f2f34d01cb9]
sql/protocol.cc:986(Protocol::send_result_set_row(List<Item>*))[0x7f2f34b23aaf]
sql/sql_class.cc:2932(select_send::send_data(List<Item>&))[0x7f2f34b8ffe3]
sql/sql_select.cc:20463(end_send)[0x7f2f34c1903f]
sql/sql_class.h:3868(THD::get_stmt_da())[0x7f2f34bfda1c]
sql/sql_select.cc:19291(sub_select(JOIN*, st_join_table*, bool))[0x7f2f34c0769e]
sql/sql_select.cc:18824(do_select)[0x7f2f34c28d42]
sql/sql_select.cc:3823(JOIN::exec())[0x7f2f34c28f93]
sql/sql_select.cc:4229(mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x7f2f34c290ea]
sql/sql_select.cc:382(handle_select(THD*, LEX*, select_result*, unsigned long))[0x7f2f34c29bfc]
sql/sql_parse.cc:6547(execute_sqlcom_select)[0x7f2f34adf19f]
sql/sql_parse.cc:3768(mysql_execute_command(THD*))[0x7f2f34bd5fbd]
sql/sql_parse.cc:8089(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x7f2f34bd87cb]
sql/sql_parse.cc:1850(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x7f2f34bdb315]
sql/sql_parse.cc:1397(do_command(THD*))[0x7f2f34bdc17e]
sql/sql_connect.cc:1402(do_handle_one_connection(CONNECT*))[0x7f2f34cac50a]
sql/sql_connect.cc:1310(handle_one_connection)[0x7f2f34cac62d]
pthread_create.c:0(start_thread)[0x7f2f341ecdc5]
/lib64/libc.so.6(clone+0x6d)[0x7f2f32842ced]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7f2f38937e10): SELECT spider_direct_sql( 'SELECT * FROM sbtest s WHERE s.id IN(10,12,13)', 'res', concat('host "', host, '", port "', port, '", user "', username, '", password "', password, '", database "', tgt_db_name, '"') ) a FROM mysql.spider_tables WHERE db_name = 'backend' and table_name like 'sbtest#P#pt%'
Connection ID (thread ID): 28
Status: NOT_KILLED