Replica's DML event deadlocks with online alter table

source include/master-slave.inc;

--connection slave

source include/stop_slave.inc;

#

# MDEV-31755 Replica's DML event deadlocks wit online alter table

#

# Three threads for SA,U,CA

--let $slave_parallel_threads=`select @@global.slave_parallel_threads`

--let $slave_parallel_mode=   `select @@global.slave_parallel_mode`

set global slave_parallel_threads=3;

set global slave_parallel_mode= optimistic;

--connection master

create table t (id int, a int, b text, primary key (id));

insert into t values (1,10,''),(2,20,'');

set @@session.binlog_alter_two_phase=1;

set debug_sync= 'alter_table_online_progress signal ready wait_for go';

send alter table t force, algorithm=copy, lock=none;

connect (con1,localhost,root,,);

set debug_sync= 'now wait_for ready';

update t set a = 1;

set debug_sync= 'now signal go';

--connection master

--reap

--source include/save_master_gtid.inc

--connection slave

source include/start_slave.inc;

--source include/sync_with_master_gtid.inc