Assertion `thd->mdl_context.is_lock_owner(MDL_key::TABLE, share->db.str, share->table_name.str, MDL_EXCLUSIVE)' failed in TDC_element::flush

CREATE TABLE t (c INT) ENGINE=InnoDB;

LOCK TABLE t WRITE;

ALTER TABLE t DISCARD TABLESPACE;

mysqld: /test/11.0_dbg/sql/table_cache.cc:1259: void TDC_element::flush(THD*, bool): Assertion `thd->mdl_context.is_lock_owner(MDL_key::TABLE, share->db.str, share->table_name.str, MDL_EXCLUSIVE)' failed.

Core was generated by `/test/MD090123-mariadb-11.0.1-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=22720988378688)

    at ./nptl/pthread_kill.c:44

[Current thread is 1 (Thread 0x14aa2470f640 (LWP 520108))]

(gdb) bt

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=22720988378688) at ./nptl/pthread_kill.c:44

#1  __pthread_kill_internal (signo=6, threadid=22720988378688) at ./nptl/pthread_kill.c:78

#2  __GI___pthread_kill (threadid=22720988378688, signo=signo@entry=6) at ./nptl/pthread_kill.c:89

#3  0x000014aa3d395476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26

#4  0x000014aa3d37b7f3 in __GI_abort () at ./stdlib/abort.c:79

#5  0x000014aa3d37b71b in __assert_fail_base (fmt=0x14aa3d530150 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x559025309428 "thd->mdl_context.is_lock_owner(MDL_key::TABLE, share->db.str, share->table_name.str, MDL_EXCLUSIVE)", file=0x559025308f78 "/test/11.0_dbg/sql/table_cache.cc", line=1259, function=<optimized out>) at ./assert/assert.c:92

#6  0x000014aa3d38ce96 in __GI___assert_fail (assertion=0x559025309428 "thd->mdl_context.is_lock_owner(MDL_key::TABLE, share->db.str, share->table_name.str, MDL_EXCLUSIVE)", file=0x559025308f78 "/test/11.0_dbg/sql/table_cache.cc", line=1259, function=0x559025309528 "void TDC_element::flush(THD*, bool)") at ./assert/assert.c:101

#7  0x0000559024a88b48 in TDC_element::flush (this=0x14a9e401beb8, thd=thd@entry=0x14a9e4000d58, mark_flushed=mark_flushed@entry=true) at /test/11.0_dbg/sql/table_cache.cc:1259

#8  0x000055902492ae1c in mysql_discard_or_import_tablespace (thd=thd@entry=0x14a9e4000d58, table_list=table_list@entry=0x14a9e4013218, discard=<optimized out>) at /test/11.0_dbg/sql/sql_table.cc:5650

#9  0x00005590249bb03c in Sql_cmd_discard_import_tablespace::execute (this=0x14a9e4013938, thd=0x14a9e4000d58) at /test/11.0_dbg/sql/sql_alter.cc:593

#10 0x0000559024864f1b in mysql_execute_command (thd=thd@entry=0x14a9e4000d58, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /test/11.0_dbg/sql/sql_parse.cc:6001

#11 0x0000559024866934 in mysql_parse (thd=thd@entry=0x14a9e4000d58, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x14aa2470e2c0) at /test/11.0_dbg/sql/sql_parse.cc:8000

#12 0x0000559024868ac8 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x14a9e4000d58, packet=packet@entry=0x14a9e400ae09 "ALTER TABLE t DISCARD TABLESPACE", packet_length=packet_length@entry=32, blocking=blocking@entry=true) at /test/11.0_dbg/sql/sql_class.h:243

#13 0x000055902486a921 in do_command (thd=0x14a9e4000d58, blocking=blocking@entry=true) at /test/11.0_dbg/sql/sql_parse.cc:1407

#14 0x00005590249b49ea in do_handle_one_connection (connect=<optimized out>, connect@entry=0x559027b82998, put_in_cache=put_in_cache@entry=true) at /test/11.0_dbg/sql/sql_connect.cc:1416

#15 0x00005590249b4c4e in handle_one_connection (arg=0x559027b82998) at /test/11.0_dbg/sql/sql_connect.cc:1318

#16 0x000014aa3d3e7b43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#17 0x000014aa3d479a00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81