[bb-10.0-monty] safe_mutex: Trying to lock mutex when the mutex was already locked

safe_mutex: Trying to lock mutex at /data/src/bb-10.0-monty/sql/slave.cc, line 660, when the mutex was already locked at /data/src/bb-10.0-monty/sql/slave.cc, line 653 in thread T@11

170204  4:42:07 [ERROR] mysqld got signal 6 ;

#5  0x00007f4bb1ef5448 in __GI_abort () at abort.c:89

#6  0x00000000013fc4de in safe_mutex_lock (mp=0x7f4b883871d8, my_flags=0, file=0x1482f70 "/data/src/bb-10.0-monty/sql/slave.cc", line=660) at /data/src/bb-10.0-monty/mysys/thr_mutex.c:266

#7  0x00000000005c4745 in inline_mysql_mutex_lock (that=0x7f4b883871d8, src_file=0x1482f70 "/data/src/bb-10.0-monty/sql/slave.cc", src_line=660) at /data/src/bb-10.0-monty/include/mysql/psi/mysql_thread.h:689

#8  0x00000000005c73a5 in terminate_slave_threads (mi=0x7f4b88385000, thread_mask=4, skip_lock=false) at /data/src/bb-10.0-monty/sql/slave.cc:660

#9  0x000000000088cbc0 in free_key_master_info (mi=0x7f4b88385000) at /data/src/bb-10.0-monty/sql/rpl_mi.cc:735

#10 0x00000000013b6870 in my_hash_delete (hash=0x7f4bb1414da0, record=0x7f4b88385000 "02\262\001") at /data/src/bb-10.0-monty/mysys/hash.c:607

#11 0x000000000088f69a in Master_info_index::remove_master_info (this=0x7f4bb1414a00, mi=0x7f4b88385000) at /data/src/bb-10.0-monty/sql/rpl_mi.cc:1281

#12 0x00000000008e9d7f in reload_acl_and_cache (thd=0x7f4b999c7070, options=64, tables=0x0, write_to_binlog=0x7f4bb41022dc) at /data/src/bb-10.0-monty/sql/sql_reload.cc:368

#13 0x00000000006d5238 in mysql_execute_command (thd=0x7f4b999c7070) at /data/src/bb-10.0-monty/sql/sql_parse.cc:4301

#14 0x00000000006deaa4 in mysql_parse (thd=0x7f4b999c7070, rawbuf=0x7f4b86c22088 "RESET SLAVE ALL /* QNO 3507 CON_ID 7 */", length=39, parser_state=0x7f4bb41026a0) at /data/src/bb-10.0-monty/sql/sql_parse.cc:6569

#15 0x00000000006c8240 in dispatch_command (command=COM_QUERY, thd=0x7f4b999c7070, packet=0x7f4b999d0071 "RESET SLAVE ALL /* QNO 3507 CON_ID 7 */ ", packet_length=40) at /data/src/bb-10.0-monty/sql/sql_parse.cc:1309

#16 0x00000000006c6c31 in do_command (thd=0x7f4b999c7070) at /data/src/bb-10.0-monty/sql/sql_parse.cc:999

#17 0x000000000089c3b8 in do_handle_one_connection (thd_arg=0x7f4b999c7070) at /data/src/bb-10.0-monty/sql/sql_connect.cc:1377

#18 0x000000000089bf0a in handle_one_connection (arg=0x7f4b999c7070) at /data/src/bb-10.0-monty/sql/sql_connect.cc:1292

#19 0x00007f4bb3def0a4 in start_thread (arg=0x7f4bb4103700) at pthread_create.c:309

#20 0x00007f4bb1fa787d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111