^^&&^^

Edit File: flush-hang.test

--echo #
--echo #Bug #21133329   HANGING "SYSTEM LOCK" WHEN EXECUTING "FLUSH TABLE ... FOR EXPORT"
--echo #

--source include/not_embedded.inc
--source include/have_debug.inc
--source include/have_innodb.inc

CREATE TABLE t1 (
	c1 BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
	c2 BIGINT,
	c3 VARCHAR(2048),
	c4 VARCHAR(2048),
	INDEX idx1(c2),
	INDEX idx2(c3(512)),
	INDEX idx3(c4(512))) Engine=InnoDB;

CREATE TABLE t2 ( f1 int PRIMARY KEY) engine=innodb;

# Stop purge so that it doesn't remove the delete marked entries.
SET GLOBAL INNODB_PURGE_STOP_NOW=ON;

# Disable change buffer merge from the master thread, additionally
# enable aggressive flushing so that more changes are buffered.
SET GLOBAL innodb_disable_background_merge=ON;
SET GLOBAL innodb_stats_persistent=OFF;
show variables like '%innodb_stats_persistent%';

INSERT INTO t1(c2, c3, c4) VALUES
	(1, REPEAT('a', 2048), REPEAT('a', 2048)),
	(2, REPEAT('b', 2048), REPEAT('b', 2048)),
	(3, REPEAT('c', 2048), REPEAT('c', 2048)),
	(4, REPEAT('d', 2048), REPEAT('d', 2048));

INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;

FLUSH TABLES t2 FOR EXPORT;
UNLOCK TABLES;

SET GLOBAL innodb_disable_background_merge=OFF;
SET GLOBAL INNODB_PURGE_RUN_NOW=ON;
SET GLOBAL innodb_stats_persistent=ON;

DROP TABLE t1,t2;