rpl.rpl_binlog_errors fails in buildbot with valgrind warnings - bytes are possibly lost

rpl.rpl_binlog_errors 'mix,xtradb'       w5 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2016-06-11 11:17:42

line

==2417== 288 bytes in 1 blocks are possibly lost in loss record 2 of 3

==2417==    at 0x4C25553: calloc (vg_replace_malloc.c:711)

==2417==    by 0x4010AEE: _dl_allocate_tls (in /lib64/ld-2.9.so)

==2417==    by 0x4E3774A: pthread_create@@GLIBC_2.2.5 (in /lib64/libpthread-2.9.so)

==2417==    by 0xA1B92B: spawn_thread_v1 (pfs.cc:1038)

==2417==    by 0x53F42C: inline_mysql_thread_create (mysql_thread.h:1061)

==2417==    by 0x53F42C: start_slave_thread(unsigned int, void* (*)(void*), st_mysql_mutex*, st_mysql_mutex*, st_mysql_cond*, unsigned int volatile*, unsigned long volatile*, Master_info*) (slave.cc:738)

==2417==    by 0x53F7CD: start_slave_threads(bool, bool, Master_info*, char const*, char const*, int) (slave.cc:818)

==2417==    by 0x5EA23B: start_slave(THD*, Master_info*, bool) (sql_repl.cc:1345)

==2417==    by 0x5CB76D: mysql_execute_command(THD*) (sql_parse.cc:2698)

==2417==    by 0x5CFBB4: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:5934)

==2417==    by 0x5D22F9: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1079)

==2417==    by 0x5D2BC6: do_command(THD*) (sql_parse.cc:793)

==2417==    by 0x6AD6D3: do_handle_one_connection(THD*) (sql_connect.cc:1270)

==2417==    by 0x6AD7D3: handle_one_connection (sql_connect.cc:1186)

==2417==    by 0xA1B9B7: pfs_spawn_thread (pfs.cc:1015)

==2417==    by 0x4E3806F: start_thread (in /lib64/libpthread-2.9.so)

==2417==    by 0x62FC13C: clone (in /lib64/libc-2.9.so)