Assertion `!thd->get_stmt_da()->is_sent() || thd->killed == KILL_CONNECTION' failed in ha_maria::external_lock

CREATE TABLE t1 (a INT) ENGINE=Aria;

--connect (con1,localhost,root,,)

FLUSH TABLE t1 FOR EXPORT;

--error ER_CONNECTION_KILLED

KILL CONNECTION_ID();

--disconnect con1

--connection default

DROP TABLE t1;

mysqld: /data/src/10.1/storage/maria/ha_maria.cc:2768: virtual int ha_maria::external_lock(THD*, int): Assertion `!thd->get_stmt_da()->is_sent() || thd->killed == KILL_CONNECTION' failed.

190107 22:03:28 [ERROR] mysqld got signal 6 ;

#7  0x00007f2b0ef67ee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x000055afd98796d9 in ha_maria::external_lock (this=0x7f2b06445088, thd=0x7f2b07cdb070, lock_type=2) at /data/src/10.1/storage/maria/ha_maria.cc:2767

#9  0x000055afd96bc5f8 in handler::ha_external_lock (this=0x7f2b06445088, thd=0x7f2b07cdb070, lock_type=2) at /data/src/10.1/sql/handler.cc:5866

#10 0x000055afd979f996 in unlock_external (thd=0x7f2b07cdb070, table=0x7f2b0641d698, count=1) at /data/src/10.1/sql/lock.cc:673

#11 0x000055afd979efc8 in mysql_unlock_tables (thd=0x7f2b07cdb070, sql_lock=0x7f2b0641d670, free_lock=true) at /data/src/10.1/sql/lock.cc:399

#12 0x000055afd979ef34 in mysql_unlock_tables (thd=0x7f2b07cdb070, sql_lock=0x7f2b0641d670) at /data/src/10.1/sql/lock.cc:388

#13 0x000055afd9403517 in close_thread_tables (thd=0x7f2b07cdb070) at /data/src/10.1/sql/sql_base.cc:1030

#14 0x000055afd940702a in Locked_tables_list::unlock_locked_tables (this=0x7f2b07cdea18, thd=0x7f2b07cdb070) at /data/src/10.1/sql/sql_base.cc:2868

#15 0x000055afd942c172 in THD::cleanup (this=0x7f2b07cdb070) at /data/src/10.1/sql/sql_class.cc:1482

#16 0x000055afd939fc24 in thd_cleanup (thd=0x7f2b07cdb070) at /data/src/10.1/sql/mysqld.cc:2763

#17 0x000055afd939fd8d in unlink_thd (thd=0x7f2b07cdb070) at /data/src/10.1/sql/mysqld.cc:2831

#18 0x000055afd93a0191 in one_thread_per_connection_end (thd=0x7f2b07cdb070, put_in_cache=true) at /data/src/10.1/sql/mysqld.cc:2959

#19 0x000055afd95a51cb in do_handle_one_connection (thd_arg=0x7f2b07cdb070) at /data/src/10.1/sql/sql_connect.cc:1349

#20 0x000055afd95a4e22 in handle_one_connection (arg=0x7f2b07cdb070) at /data/src/10.1/sql/sql_connect.cc:1242

#21 0x000055afd99630a0 in pfs_spawn_thread (arg=0x7f2b0e43a3f0) at /data/src/10.1/storage/perfschema/pfs.cc:1861

#22 0x00007f2b10c6b494 in start_thread (arg=0x7f2b10fa1b00) at pthread_create.c:333

#23 0x00007f2b0f02493f in clone () from /lib/x86_64-linux-gnu/libc.so.6

Query (0x0): 

Connection ID (thread ID): 4

Status: KILL_CONNECTION