Assertion `sp > last_savepoint()' failed

MariaDB [m8]> set global federated_pushdown=ON;

MariaDB [m8]> UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a >0; 

ERROR 1159 (08S01): Got timeout reading communication packets

MariaDB [m8]> set global federated_pushdown=OFF;

MariaDB [m8]> UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a <2;

ERROR 2027 (HY000): Received malformed packet

MariaDB [m8]> UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a <2;

ERROR 2026 (HY000): TLS/SSL error: unexpected eof while reading

#11 __assert_fail_base (fmt="%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry="sp > last_savepoint()", 

    file=file@entry="/home/ppandith/wl-39226/storage/federatedx/federatedx_io_mysql.cc", line=line@entry=238, 

    function=function@entry="virtual int federatedx_io_mysql::savepoint_set(ulong)") at ./assert/assert.c:96

#12 __assert_fail (assertion="sp > last_savepoint()", file="/home/ppandith/wl-39226/storage/federatedx/federatedx_io_mysql.cc", 

    line=238, function="virtual int federatedx_io_mysql::savepoint_set(ulong)") at ./assert/assert.c:105

#13 federatedx_io_mysql::savepoint_set (this=, sp=1) at /home/ppandith/wl-39226/storage/federatedx/federatedx_io_mysql.cc:238

#14 federatedx_txn::sp_acquire (this=, sp=) at /home/ppandith/wl-39226/storage/federatedx/federatedx_txn.cc:308

#15 federatedx_txn::stmt_begin (this=) at /home/ppandith/wl-39226/storage/federatedx/federatedx_txn.cc:373

#16 ha_federatedx::external_lock (this=, thd=, lock_type=1) at /home/ppandith/wl-39226/storage/federatedx/ha_federatedx.cc:3550

#17 handler::ha_external_lock (this=, thd=, lock_type=1) at /home/ppandith/wl-39226/sql/handler.cc:8044

#18 lock_external (thd=, tables=, count=2) at /home/ppandith/wl-39226/sql/lock.cc:443

#19 mysql_lock_tables (thd=, sql_lock=, flags=0) at /home/ppandith/wl-39226/sql/lock.cc:388

#20 mysql_lock_tables (thd=, tables=, count=2, flags=0) at /home/ppandith/wl-39226/sql/lock.cc:351

#21 lock_tables (thd=, tables=, count=2, flags=0) at /home/ppandith/wl-39226/sql/sql_base.cc:6099

#22 Sql_cmd_dml::execute (this=, thd=) at /home/ppandith/wl-39226/sql/sql_select.cc:34971

#23 mysql_execute_command (thd=, is_called_from_prepared_stmt=false) at /home/ppandith/wl-39226/sql/sql_parse.cc:4452

#24 mysql_parse (thd=, rawbuf="UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a <2", length=56, parser_state=)

    at /home/ppandith/wl-39226/sql/sql_parse.cc:7968

#25 dispatch_command (command=COM_QUERY, thd=, packet="UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a <2", packet_length=56, 

    blocking=true) at /home/ppandith/wl-39226/sql/sql_parse.cc:1903

#26 do_command (thd=, blocking=true) at /home/ppandith/wl-39226/sql/sql_parse.cc:1437

#27 do_handle_one_connection (connect=, put_in_cache=true) at /home/ppandith/wl-39226/sql/sql_connect.cc:1514

#28 handle_one_connection (arg=) at /home/ppandith/wl-39226/sql/sql_connect.cc:1426

#29 pfs_spawn_thread (arg=) at /home/ppandith/wl-39226/storage/perfschema/pfs.cc:2198

#30 start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447

#31 clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

create table s1( a int);

create table s1(a int)  ENGINE="FEDERATED" CONNECTION='mysql://u3:pass1@127.0.0.1:3306/m8/s1';

insert into s1 select seq from seq_1_to_100000;

set global federated_pushdown=ON;

UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a >0;

set global federated_pushdown=OFF;

UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a <2;

UPDATE s1 JOIN s1 AS OUTR2 SET OUTR2.a = 1 where s1.a <2;