FLUSH TABLES;
CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1),(2);
connect  wait,localhost,root,,test;
SET DEBUG_SYNC='before_trx_state_committed_in_memory SIGNAL c WAIT_FOR ever';
TRUNCATE TABLE t1;
connection default;
SET DEBUG_SYNC='now WAIT_FOR c';
# restart
disconnect wait;
InnoDB		0 transactions not purged
SELECT COUNT(*) FROM t1;
COUNT(*)
0
TRUNCATE TABLE t1;
DROP TABLE t1;