connection node_2;
connection node_1;
connect con1,127.0.0.1,root,,test,$NODE_MYPORT_1;
CREATE TABLE t1(c1 INT PRIMARY KEY) ENGINE=InnoDB;
CREATE TABLE t1_fk(c1 INT PRIMARY KEY, c2 INT, INDEX (c2), FOREIGN KEY (c2) REFERENCES t1(c1)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
connection con1;
SET SESSION wsrep_retry_autocommit = 0;
SET DEBUG_SYNC = 'ib_after_row_insert SIGNAL may_alter WAIT_FOR bf_abort';
INSERT INTO t1_fk VALUES (1, 1);
connection node_1;
SET DEBUG_SYNC = 'now WAIT_FOR may_alter';
SET DEBUG_SYNC = 'lock_wait_end WAIT_FOR alter_continue';
ALTER TABLE t1 ADD COLUMN c2 INT, ALGORITHM=INPLACE;
connection con1;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
SET DEBUG_SYNC = 'now SIGNAL alter_continue';
connection node_1;
connection node_2;
INSERT INTO t1 (c1, c2) VALUES (2, 2);
connection node_1;
SET DEBUG_SYNC = 'RESET';
DROP TABLE t1_fk, t1;
disconnect con1;
disconnect node_2;
disconnect node_1;