rpl.rpl_row_until failed in buildbot

rpl.rpl_row_until 'row'                  w4 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2017-10-11 21:30:39

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2017-10-11 21:30:37 416 [Warning] Master is configured to log replication events with checksum, but will not send such events to slaves that cannot process them

CURRENT_TEST: rpl.rpl_row_until

2017-10-11 21:30:36 409 [Note] Deleted Master_info file '/run/shm/var_auto_kwIq/4/mysqld.1/data/master.info'.

2017-10-11 21:30:36 409 [Note] Deleted Master_info file '/run/shm/var_auto_kwIq/4/mysqld.1/data/relay-log.info'.

2017-10-11 21:30:36 402 [Warning] Aborted connection 402 to db: 'unconnected' user: 'root' host: 'localhost' (A slave with the same server_uuid/server_id as this slave has co)

2017-10-11 21:30:36 411 [Note] Start binlog_dump to slave_server(2), pos(master-bin.000001, 4)

2017-10-11 21:30:36 414 [Note] Start binlog_dump to slave_server(2), pos(, 4)

2017-10-11 21:30:37 415 [Warning] Aborted connection 415 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)

2017-10-11 21:30:37 416 [Note] Start binlog_dump to slave_server(2), pos(master-bin.000001, 1746)

2017-10-11 21:30:37 416 [Warning] Master is configured to log replication events with checksum, but will not send such events to slaves that cannot process them

2017-10-11 21:30:37 417 [Note] Start binlog_dump to slave_server(2), pos(, 4)

2017-10-11 21:30:37 418 [Note] Start binlog_dump to slave_server(2), pos(, 4)

2017-10-11 21:30:38 409 [Note] Master connection name: ''  Master_info_file: 'master.info'  Relay_info_file: 'relay-log.info'

2017-10-11 21:30:38 409 [Note] 'CHANGE MASTER TO executed'. Previous state master_host='', master_port='3306', master_log_file='', master_log_pos='4'. New state master_host='', master_port='3306', master_log_file='', master_log_pos='4'.