SIGSEGV in spider_conn_first_link_idx and others on DELETE, INSERT and SELECT

INSTALL PLUGIN Spider SONAME 'ha_spider.so';

--error ER_NO_SUCH_TABLE

SHOW CREATE TABLE t;

CREATE TABLE t (c INT, PRIMARY KEY(c)) ENGINE=Spider;

SHOW CREATE TABLE t;

DROP TABLE t;

CREATE TABLE t (c INT) ENGINE=Spider REMOTE_PORT="1 1";

DELETE FROM t;

Core was generated by `/test/MDEV28856_MD141023-mariadb-11.3.0-linux-x86_64-dbg/bin/mariadbd --default'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x0000149a923b2764 in spider_conn_first_link_idx (

    thd=thd@entry=0x149a80000d58, link_statuses=0x149a80074468, 

    access_balances=0x149a80128b18, conn_link_idx=0x149a80166a48, 

    link_count=2, link_status=link_status@entry=1)

    at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/storage/spider/spd_conn.cc:3746

[Current thread is 1 (Thread 0x149a924b4640 (LWP 3283577))]

(gdb) bt

#0  0x0000149a923b2764 in spider_conn_first_link_idx (thd=thd@entry=0x149a80000d58, link_statuses=0x149a80074468, access_balances=0x149a80128b18, conn_link_idx=0x149a80166a48, link_count=2, link_status=link_status@entry=1) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/storage/spider/spd_conn.cc:3746

#1  0x0000149a923905fe in spider_check_trx_and_get_conn (thd=0x149a80000d58, spider=spider@entry=0x149a80249a60) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/storage/spider/spd_trx.cc:3523

#2  0x0000149a9240198d in ha_spider::info (this=0x149a80249a60, flag=18) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/storage/spider/ha_spider.cc:6653

#3  0x000055c5cb7f5003 in Sql_cmd_delete::delete_from_single_table (this=this@entry=0x149a80015698, thd=thd@entry=0x149a80000d58) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_delete.cc:430

#4  0x000055c5cb7f7510 in Sql_cmd_delete::execute_inner (this=0x149a80015698, thd=0x149a80000d58) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_delete.cc:1800

#5  0x000055c5cb88ba57 in Sql_cmd_dml::execute (this=0x149a80015698, thd=0x149a80000d58) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_select.cc:33350

#6  0x000055c5cb84902a in mysql_execute_command (thd=thd@entry=0x149a80000d58, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_parse.cc:4360

#7  0x000055c5cb84e2a5 in mysql_parse (thd=thd@entry=0x149a80000d58, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x149a924b31e0) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_parse.cc:7734

#8  0x000055c5cb85061b in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x149a80000d58, packet=packet@entry=0x149a801111d9 "DELETE FROM t", packet_length=packet_length@entry=13, blocking=blocking@entry=true) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_class.h:251

#9  0x000055c5cb85273b in do_command (thd=0x149a80000d58, blocking=blocking@entry=true) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_parse.cc:1406

#10 0x000055c5cb9b198d in do_handle_one_connection (connect=<optimized out>, connect@entry=0x55c5ce277188, put_in_cache=put_in_cache@entry=true) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_connect.cc:1445

#11 0x000055c5cb9b1c82 in handle_one_connection (arg=arg@entry=0x55c5ce277188) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/sql/sql_connect.cc:1347

#12 0x000055c5cbdf45bc in pfs_spawn_thread (arg=0x55c5ce1ef218) at /test/git-bisect/preview-11.3-preview_MDEV-28856_patched_dbg/storage/perfschema/pfs.cc:2201

#13 0x0000149a97a94ac3 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#14 0x0000149a97b26a40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81