CREATE TABLE t1(
a INT AUTO_INCREMENT PRIMARY KEY,
b CHAR(1),
c INT,
INDEX(b))
ENGINE=InnoDB STATS_PERSISTENT=0;
SET GLOBAL innodb_change_buffering_debug = 1;
INSERT INTO t1 SELECT 0,'x',1 FROM seq_1_to_1024;
# restart: --innodb-force-recovery=6 --innodb-change-buffer-dump
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	Warning	InnoDB: Index 'b' contains 990 entries, should be 1024.
test.t1	check	error	Corrupt
# restart
SET GLOBAL innodb_fast_shutdown=0;
# restart
DROP TABLE t1;