#
# MDEV-35508: Race condition between purge and secondary index INSERT or UPDATE
#
SET @old_debug_dbug = @@global.debug_dbug;
CREATE TABLE t1(col1 INT PRIMARY KEY, col2 int, KEY k1(col2)) ENGINE=Innodb;
INSERT INTO t1 VALUES(1, 100);
CREATE TABLE t2(col1 INT PRIMARY KEY) Engine=Innodb;
InnoDB		0 transactions not purged
START TRANSACTION;
INSERT INTO t2 VALUES(10);
SET DEBUG_SYNC='RESET';
SET GLOBAL debug_dbug= "+d,btr_force_pessimistic_delete";
SET GLOBAL debug_dbug= "+d,enable_row_purge_sec_tree_sync";
connect  con1,localhost,root;
UPDATE t1 SET col2 = 200 WHERE col1 = 1;
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR purge_sec_tree_begin';
SET GLOBAL debug_dbug= "-d,enable_row_purge_sec_tree_sync";
UPDATE t1 SET col2 = 100 WHERE col1 = 1;
SET DEBUG_SYNC= 'now SIGNAL purge_sec_tree_execute';
COMMIT;
InnoDB		0 transactions not purged
disconnect con1;
SELECT * FROM t1;
col1	col2
1	100
CHECK TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
DROP TABLE t1;
SELECT * FROM t2;
col1
10
DROP TABLE t2;
SET @@GLOBAL.debug_dbug = @old_debug_dbug;
SET DEBUG_SYNC='RESET';