rpl.rpl_sp_effects failed in buildbot (server crash)

rpl.rpl_sp_effects 'row'                 w2 [ fail ]

        Test ended at 2017-06-13 10:01:22

CURRENT_TEST: rpl-tokudb.rpl_parallel_tokudb

mysqltest: In included file "./include/wait_condition.inc": 

included from /usr/local/mariadb-10.2.7-linux-x86_64/mysql-test/plugin/tokudb/rpl/extra/rpl_tests/rpl_parallel_load_tokudb.test at line 263:

included from /usr/local/mariadb-10.2.7-linux-x86_64/mysql-test/plugin/tokudb/rpl/t/rpl_parallel_tokudb.test at line 14:

At line 43: query 'let $success= `$wait_condition`' failed with wrong errno 2013: 'Lost connection to MySQL server during query', instead of 0...

The result from queries just before the failure was:

include/master-slave.inc

[connection master]

connection master;

connection slave;

call mtr.add_suppression('Slave: Error dropping database');

include/stop_slave.inc

start slave;

connection master;

connection slave;

stop slave sql_thread;

connection master;

connection slave;

insert into test0.benchmark set state='slave is processing load';

start slave sql_thread;

CURRENT_TEST: rpl-tokudb.rpl_parallel_tokudb

mysqltest: In included file "./include/wait_condition.inc": 

included from /usr/local/mariadb-10.2.7-linux-x86_64/mysql-test/plugin/tokudb/rpl/extra/rpl_tests/rpl_parallel_load_tokudb.test at line 263:

included from /usr/local/mariadb-10.2.7-linux-x86_64/mysql-test/plugin/tokudb/rpl/t/rpl_parallel_tokudb.test at line 14:

At line 43: query 'let $success= `$wait_condition`' failed with wrong errno 2013: 'Lost connection to MySQL server during query', instead of 0...

The result from queries just before the failure was:

include/master-slave.inc

[connection master]

connection master;

connection slave;

call mtr.add_suppression('Slave: Error dropping database');

include/stop_slave.inc

start slave;

connection master;

connection slave;

stop slave sql_thread;

connection master;

connection slave;

insert into test0.benchmark set state='slave is processing load';

start slave sql_thread;

CURRENT_TEST: rpl.rpl_sp_effects

Failed to start mysqld.1

 - skipping '/usr/local/mariadb-10.2.7-linux-x86_64/mysql-test/var/2/log/rpl.rpl_sp_effects-row/'

worker[2] > Restart  - not started

worker[2] > Restart  - not started

Retrying test rpl.rpl_sp_effects, attempt(2/3)...