sys_vars.log_slow_admin_statements_func failed in buildbot (server crashed)

sys_vars.log_slow_admin_statements_func 'xtradb' w1 [ fail ]

        Test ended at 2017-03-01 12:17:44

CURRENT_TEST: sys_vars.log_slow_admin_statements_func

mysqltest: At line 50: query 'DROP TABLE log_slow_admin_statements' failed: 2013: Lost connection to MySQL server during query

The result from queries just before the failure was:

< snip >

CREATE PROCEDURE add_rows()

BEGIN

DECLARE count INT;

SET count = 1;

INSERT INTO log_slow_admin_statements(j) values (REPEAT('A', 255));

WHILE count <= 15 DO

INSERT INTO log_slow_admin_statements(j) SELECT j FROM log_slow_admin_statements;

SET count = count + 1;

END WHILE;

END

$

CALL add_rows();

OPTIMIZE TABLE log_slow_admin_statements;

Table	Op	Msg_type	Msg_text

test.log_slow_admin_statements	optimize	note	Table does not support optimize, doing recreate + analyze instead

test.log_slow_admin_statements	optimize	status	OK

CHECK TABLE log_slow_admin_statements EXTENDED;

Table	Op	Msg_type	Msg_text

test.log_slow_admin_statements	check	status	OK

DROP TABLE log_slow_admin_statements;

More results from queries before failure can be found in /dev/shm/var/1/log/log_slow_admin_statements_func.log

Server [mysqld.1 - pid: 20449, winpid: 20449, exit: 256] failed during test run

Server log from this test:

----------SERVER LOG START-----------

2017-03-01 12:17:38 3054567232 [Note] InnoDB: Online DDL : Start

2017-03-01 12:17:38 3054567232 [Note] InnoDB: Online DDL : Start reading clustered index of the table and create temporary files

2017-03-01 12:17:38 3054567232 [Note] InnoDB: Online DDL : End of reading clustered index of the table and create temporary files

2017-03-01 12:17:38 3054567232 [Note] InnoDB: Online DDL : Completed

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : Start

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : Start reading clustered index of the table and create temporary files

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : End of reading clustered index of the table and create temporary files

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : Start merge-sorting index `PRIMARY` (1 / 1), estimated cost : 20.0000

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : merge-sorting has estimated 9 runs

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : End of  merge-sorting index `PRIMARY` (1 / 1)

2017-03-01 12:17:42 3054567232 [Note] InnoDB: Online DDL : Start building index `PRIMARY` (1 / 1), estimated cost : 30.0000

2017-03-01 12:17:43 3054567232 [Note] InnoDB: Online DDL : End of building index `PRIMARY` (1 / 1)

2017-03-01 12:17:43 3054567232 [Note] InnoDB: Online DDL : Completed

170301 12:17:43 [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: 10.1.22-MariaDB-1~jessie

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=3

max_threads=153

thread_count=1

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 61771 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0

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 = 0x0 thread_stack 0x48400

/usr/sbin/mysqld(my_print_stacktrace+0x28)[0xb72c6b88]

/usr/sbin/mysqld(handle_fatal_signal+0x2f7)[0xb6dde9a7]

linux-gate.so.1(__kernel_sigreturn+0x0)[0xb69a2d18]

/usr/sbin/mysqld(+0x7c7eb7)[0xb718deb7]

/usr/sbin/mysqld(+0x7cd108)[0xb7193108]

/usr/sbin/mysqld(+0x8236e3)[0xb71e96e3]

/usr/sbin/mysqld(+0x758e64)[0xb711ee64]

/lib/i386-linux-gnu/i686/cmov/libpthread.so.0(+0x6ecb)[0xb6983ecb]

/lib/i386-linux-gnu/i686/cmov/libc.so.6(clone+0x5e)[0xb642fd0e]

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.

Writing a core file

----------SERVER LOG END-------------

 - saving '/dev/shm/var/1/log/sys_vars.log_slow_admin_statements_func-xtradb/' to '/dev/shm/var/log/sys_vars.log_slow_admin_statements_func-xtradb/'

Retrying test sys_vars.log_slow_admin_statements_func, attempt(2/3)...

worker[1] > Restart  - not started