Bug#30907

  "Regression: "--innodb_autoinc_lock_mode=0" (off) not same as older releases"
Bug#28430
  "Failure in replication of innodb partitioned tables on row/mixed format"
Bug#30888
  "Innodb table + stored procedure + row deletion = server crash"

  Apply Oracle patch from Sunny
  Include tests cases by Omer
  Ensure that innobase_read_and_init_auto performs table autoinc lock when lock_mode = 0
  No need for "if" guard around row_unlock_table_autoinc_for_mysql() because
  it already performs same check.
  Make autoinc_lock_mode variable read-only for duration of running mysqld process.

mysql-test/suite/rpl/r/rpl_innodb_bug28430.result

+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;
+use test;
+CREATE TABLE test.regular_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+fkid MEDIUMINT, filler VARCHAR(255),
+PRIMARY KEY(id)) ENGINE='innodb';
+CREATE TABLE test.bykey_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+fkid MEDIUMINT, filler VARCHAR(255),
+PRIMARY KEY(id)) ENGINE='innodb'
+PARTITION BY KEY(id) partitions 5;
+CREATE TABLE test.byrange_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+fkid MEDIUMINT, filler VARCHAR(255),
+PRIMARY KEY(id)) ENGINE='innodb'
+PARTITION BY RANGE(id)
+SUBPARTITION BY hash(id) subpartitions 2
+(PARTITION pa1 values less than (10),
+PARTITION pa2 values less than (20),
+PARTITION pa3 values less than (30),
+PARTITION pa4 values less than (40),
+PARTITION pa5 values less than (50),
+PARTITION pa6 values less than (60),
+PARTITION pa7 values less than (70),
+PARTITION pa8 values less than (80),
+PARTITION pa9 values less than (90),
+PARTITION pa10 values less than (100),
+PARTITION pa11 values less than MAXVALUE);
+CREATE PROCEDURE test.proc_norm()
+BEGIN
+DECLARE ins_count INT DEFAULT 1000;
+DECLARE del_count INT;
+DECLARE cur_user VARCHAR(255);
+DECLARE local_uuid VARCHAR(255);
+DECLARE local_time TIMESTAMP;
+SET local_time= NOW();
+SET cur_user= CURRENT_USER();
+SET local_uuid= UUID();
+WHILE ins_count > 0 DO
+INSERT INTO test.regular_tbl VALUES (NULL, NOW(), USER() , UUID(),
+ins_count,'Going to test MBR for MySQL');
+SET ins_count = ins_count - 1;
+END WHILE;
+SELECT MAX(id) FROM test.regular_tbl INTO del_count;
+WHILE del_count > 0 DO
+DELETE FROM test.regular_tbl WHERE id = del_count;
+SET del_count = del_count - 2;
+END WHILE;
+END|
+CREATE PROCEDURE test.proc_bykey()
+BEGIN
+DECLARE ins_count INT DEFAULT 1000;
+DECLARE del_count INT;
+DECLARE cur_user VARCHAR(255);
+DECLARE local_uuid VARCHAR(255);
+DECLARE local_time TIMESTAMP;
+SET local_time= NOW();
+SET cur_user= CURRENT_USER();
+SET local_uuid= UUID();
+WHILE ins_count > 0 DO
+INSERT INTO test.bykey_tbl VALUES (NULL, NOW(), USER() , UUID(),
+ins_count,'Going to test MBR for MySQL');
+SET ins_count = ins_count - 1;
+END WHILE;
+SELECT MAX(id) FROM test.bykey_tbl INTO del_count;
+WHILE del_count > 0 DO
+DELETE FROM test.bykey_tbl WHERE id = del_count;
+SET del_count = del_count - 2;
+END WHILE;
+END|
+CREATE PROCEDURE test.proc_byrange()
+BEGIN
+DECLARE ins_count INT DEFAULT 1000;
+DECLARE del_count INT;
+DECLARE cur_user VARCHAR(255);
+DECLARE local_uuid VARCHAR(255);
+DECLARE local_time TIMESTAMP;
+SET local_time= NOW();
+SET cur_user = CURRENT_USER();
+SET local_uuid=UUID();
+WHILE ins_count > 0 DO
+INSERT INTO test.byrange_tbl VALUES (NULL, NOW(), USER(), UUID(),
+ins_count,'Going to test MBR for MySQL');
+SET ins_count = ins_count - 1;
+END WHILE;
+SELECT MAX(id) FROM test.byrange_tbl INTO del_count;
+WHILE del_count > 0 DO
+DELETE FROM test.byrange_tbl WHERE id = del_count;
+SET del_count = del_count - 2;
+END WHILE;
+END|
+CALL test.proc_norm();
+SELECT count(*) as "Master regular" FROM test.regular_tbl;
+Master regular	500
+CALL test.proc_bykey();
+SELECT count(*) as "Master bykey" FROM test.bykey_tbl;
+Master bykey	811
+CALL test.proc_byrange();
+SELECT count(*) as "Master byrange" FROM test.byrange_tbl;
+Master byrange	996
+show create table test.byrange_tbl;
+Table	byrange_tbl
+Create Table	CREATE TABLE `byrange_tbl` (
+  `id` mediumint(9) NOT NULL AUTO_INCREMENT,
+  `dt` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `user` char(255) DEFAULT NULL,
+  `uuidf` longblob,
+  `fkid` mediumint(9) DEFAULT NULL,
+  `filler` varchar(255) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=MyISAM AUTO_INCREMENT=9 DEFAULT CHARSET=latin1 /*!50100 PARTITION BY RANGE (id) SUBPARTITION BY HASH (id) SUBPARTITIONS 2 (PARTITION pa1 VALUES LESS THAN (10) ENGINE = MyISAM, PARTITION pa2 VALUES LESS THAN (20) ENGINE = MyISAM, PARTITION pa3 VALUES LESS THAN (30) ENGINE = MyISAM, PARTITION pa4 VALUES LESS THAN (40) ENGINE = MyISAM, PARTITION pa5 VALUES LESS THAN (50) ENGINE = MyISAM, PARTITION pa6 VALUES LESS THAN (60) ENGINE = MyISAM, PARTITION pa7 VALUES LESS THAN (70) ENGINE = MyISAM, PARTITION pa8 VALUES LESS THAN (80) ENGINE = MyISAM, PARTITION pa9 VALUES LESS THAN (90) ENGINE = MyISAM, PARTITION pa10 VALUES LESS THAN (100) ENGINE = MyISAM, PARTITION pa11 VALUES LESS THAN MAXVALUE ENGINE = MyISAM) */
+show slave status;
+Slave_IO_State	Waiting for master to send event
+Master_Host	127.0.0.1
+Master_User	root
+Master_Port	12000
+Connect_Retry	1
+Master_Log_File	master-bin.000001
+Read_Master_Log_Pos	776796
+Relay_Log_File	slave-relay-bin.000003
+Relay_Log_Pos	776942
+Relay_Master_Log_File	master-bin.000001
+Slave_IO_Running	Yes
+Slave_SQL_Running	Yes
+Replicate_Do_DB	
+Replicate_Ignore_DB	
+Replicate_Do_Table	
+Replicate_Ignore_Table	
+Replicate_Wild_Do_Table	
+Replicate_Wild_Ignore_Table	
+Last_Errno	0
+Last_Error	
+Skip_Counter	0
+Exec_Master_Log_Pos	776796
+Relay_Log_Space	777097
+Until_Condition	None
+Until_Log_File	
+Until_Log_Pos	0
+Master_SSL_Allowed	No
+Master_SSL_CA_File	
+Master_SSL_CA_Path	
+Master_SSL_Cert	
+Master_SSL_Cipher	
+Master_SSL_Key	
+Seconds_Behind_Master	0
+Master_SSL_Verify_Server_Cert	No
+Last_IO_Errno	0
+Last_IO_Error	
+Last_SQL_Errno	0
+Last_SQL_Error	
+SELECT count(*) "Slave norm" FROM test.regular_tbl;
+Slave norm	500
+SELECT count(*) "Slave bykey" FROM test.bykey_tbl;
+Slave bykey	811
+SELECT count(*) "Slave byrange" FROM test.byrange_tbl;
+Slave byrange	996

mysql-test/suite/rpl/r/rpl_innodb_bug30888.result

+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;
+use test;
+CREATE TABLE test.regular_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+fkid MEDIUMINT, filler VARCHAR(255),
+PRIMARY KEY(id)) ENGINE='innodb';
+CREATE PROCEDURE test.proc_norm()
+BEGIN
+DECLARE ins_count INT DEFAULT 1000; 
+DECLARE del_count INT;
+DECLARE cur_user VARCHAR(255);
+DECLARE local_uuid VARCHAR(255);
+DECLARE local_time TIMESTAMP;
+SET local_time= NOW();
+SET cur_user= CURRENT_USER();
+SET local_uuid= UUID();
+WHILE ins_count > 0 DO
+INSERT INTO test.regular_tbl VALUES (NULL, NOW(), USER() , UUID(),
+ins_count,'Going to test MBR for MySQL');
+SET ins_count = ins_count - 1;
+END WHILE;
+SELECT MAX(id) FROM test.regular_tbl INTO del_count;
+WHILE del_count > 0 DO
+DELETE FROM test.regular_tbl WHERE id = del_count;
+SET del_count = del_count - 2;
+END WHILE;
+END|
+CALL test.proc_norm();

mysql-test/suite/rpl/t/rpl_innodb-master.opt

+--innodb --innodb_autoinc_lock_mode=0

mysql-test/suite/rpl/t/rpl_innodb_bug28430-master.opt

+--innodb --innodb_autoinc_lock_mode=0

mysql-test/suite/rpl/t/rpl_innodb_bug28430.test

+--source include/have_innodb.inc
+--source include/master-slave.inc
+
+# Set the default connection to 'master'
+
+--vertical_results
+
+let $engine_type= 'innodb';
+
+###### CLEAN UP SECTION ##############
+
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;
+
+
+######## Creat Table Section #########
+use test;
+
+eval CREATE TABLE test.regular_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+                           dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+                           fkid MEDIUMINT, filler VARCHAR(255),
+                           PRIMARY KEY(id)) ENGINE=$engine_type;
+
+eval CREATE TABLE test.bykey_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+                           dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+                           fkid MEDIUMINT, filler VARCHAR(255),
+                           PRIMARY KEY(id)) ENGINE=$engine_type
+                                PARTITION BY KEY(id) partitions 5;
+
+eval CREATE TABLE test.byrange_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+                           dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+                           fkid MEDIUMINT, filler VARCHAR(255),
+                           PRIMARY KEY(id)) ENGINE=$engine_type
+                                PARTITION BY RANGE(id)
+                                SUBPARTITION BY hash(id) subpartitions 2
+                                (PARTITION pa1 values less than (10),
+                                 PARTITION pa2 values less than (20),
+                                 PARTITION pa3 values less than (30),
+                                 PARTITION pa4 values less than (40),
+                                 PARTITION pa5 values less than (50),
+                                 PARTITION pa6 values less than (60),
+                                 PARTITION pa7 values less than (70),
+                                 PARTITION pa8 values less than (80),
+                                 PARTITION pa9 values less than (90),
+                                 PARTITION pa10 values less than (100),
+                                 PARTITION pa11 values less than MAXVALUE);
+
+######## Create SPs, Functions, Views and Triggers Section ##############
+
+delimiter |;
+CREATE PROCEDURE test.proc_norm()
+BEGIN
+   DECLARE ins_count INT DEFAULT 1000;
+   DECLARE del_count INT;
+   DECLARE cur_user VARCHAR(255);
+   DECLARE local_uuid VARCHAR(255);
+   DECLARE local_time TIMESTAMP;
+
+   SET local_time= NOW();
+   SET cur_user= CURRENT_USER();
+   SET local_uuid= UUID();
+
+   WHILE ins_count > 0 DO
+     INSERT INTO test.regular_tbl VALUES (NULL, NOW(), USER() , UUID(),
+                                   ins_count,'Going to test MBR for MySQL');
+     SET ins_count = ins_count - 1;
+   END WHILE;
+
+   SELECT MAX(id) FROM test.regular_tbl INTO del_count;
+   WHILE del_count > 0 DO
+     DELETE FROM test.regular_tbl WHERE id = del_count;
+     SET del_count = del_count - 2;
+   END WHILE;
+END|
+
+CREATE PROCEDURE test.proc_bykey()
+BEGIN
+   DECLARE ins_count INT DEFAULT 1000;
+   DECLARE del_count INT;
+   DECLARE cur_user VARCHAR(255);
+   DECLARE local_uuid VARCHAR(255);
+   DECLARE local_time TIMESTAMP;
+
+   SET local_time= NOW();
+   SET cur_user= CURRENT_USER();
+   SET local_uuid= UUID();
+
+   WHILE ins_count > 0 DO
+     INSERT INTO test.bykey_tbl VALUES (NULL, NOW(), USER() , UUID(),
+                                   ins_count,'Going to test MBR for MySQL');
+     SET ins_count = ins_count - 1;
+   END WHILE;
+
+   SELECT MAX(id) FROM test.bykey_tbl INTO del_count;
+   WHILE del_count > 0 DO
+     DELETE FROM test.bykey_tbl WHERE id = del_count;
+     SET del_count = del_count - 2;
+   END WHILE;
+END|
+
+CREATE PROCEDURE test.proc_byrange()
+BEGIN
+   DECLARE ins_count INT DEFAULT 1000;
+   DECLARE del_count INT;
+   DECLARE cur_user VARCHAR(255);
+   DECLARE local_uuid VARCHAR(255);
+   DECLARE local_time TIMESTAMP;
+
+   SET local_time= NOW();
+   SET cur_user = CURRENT_USER();
+   SET local_uuid=UUID();
+
+   WHILE ins_count > 0 DO
+     INSERT INTO test.byrange_tbl VALUES (NULL, NOW(), USER(), UUID(),
+                                    ins_count,'Going to test MBR for MySQL');
+     SET ins_count = ins_count - 1;
+   END WHILE;
+
+   SELECT MAX(id) FROM test.byrange_tbl INTO del_count;
+   WHILE del_count > 0 DO
+     DELETE FROM test.byrange_tbl WHERE id = del_count;
+   SET del_count = del_count - 2;
+   END WHILE;
+END|
+
+delimiter ;|
+
+############ Finish Setup Section ###################
+
+
+############ Test Section ###################
+
+CALL test.proc_norm();
+SELECT count(*) as "Master regular" FROM test.regular_tbl;
+CALL test.proc_bykey();
+SELECT count(*) as "Master bykey" FROM test.bykey_tbl;
+CALL test.proc_byrange();
+SELECT count(*) as "Master byrange" FROM test.byrange_tbl;
+
+--sync_slave_with_master
+connection slave;
+show create table test.byrange_tbl;
+show slave status;
+SELECT count(*) "Slave norm" FROM test.regular_tbl;
+SELECT count(*) "Slave bykey" FROM test.bykey_tbl;
+SELECT count(*) "Slave byrange" FROM test.byrange_tbl;
+
+--source include/master-slave-end.inc
+connection master;
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;

mysql-test/suite/rpl/t/rpl_innodb_bug30888.test

+--source include/have_innodb.inc
+--source include/master-slave.inc
+
+# Set the default connection to 'master'
+
+--vertical_results
+
+#let $engine_type= 'myisam';
+let $engine_type= 'innodb';
+
+###### CLEAN UP SECTION ##############
+
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;
+
+
+######## Creat Table Section #########
+use test;
+
+eval CREATE TABLE test.regular_tbl(id MEDIUMINT NOT NULL AUTO_INCREMENT,
+                           dt TIMESTAMP, user CHAR(255), uuidf LONGBLOB,
+                           fkid MEDIUMINT, filler VARCHAR(255),
+                           PRIMARY KEY(id)) ENGINE=$engine_type;
+
+######## Create SPs, Functions, Views and Triggers Section ##############
+
+delimiter |;
+CREATE PROCEDURE test.proc_norm()
+BEGIN
+   DECLARE ins_count INT DEFAULT 1000; 
+   DECLARE del_count INT;
+   DECLARE cur_user VARCHAR(255);
+   DECLARE local_uuid VARCHAR(255);
+   DECLARE local_time TIMESTAMP;
+
+   SET local_time= NOW();
+   SET cur_user= CURRENT_USER();
+   SET local_uuid= UUID();
+ 
+   WHILE ins_count > 0 DO
+     INSERT INTO test.regular_tbl VALUES (NULL, NOW(), USER() , UUID(),
+                                   ins_count,'Going to test MBR for MySQL');
+     SET ins_count = ins_count - 1;
+   END WHILE;
+   
+   SELECT MAX(id) FROM test.regular_tbl INTO del_count;
+   WHILE del_count > 0 DO
+     DELETE FROM test.regular_tbl WHERE id = del_count;
+     SET del_count = del_count - 2;
+   END WHILE;
+END|   
+
+delimiter ;|
+
+############ Finish Setup Section ###################
+
+
+############ Test Section ###################
+
+CALL test.proc_norm();
+
+#--source include/master-slave-end.inc
+--sync_slave_with_master
+connection slave;
+

storage/innobase/handler/ha_innodb.cc

@@ -1904,12 +1904,11 @@ innobase_commit(
 		/* We just mark the SQL statement ended and do not do a
 		transaction commit */
 
-		if (trx->auto_inc_lock) {
 		/* If we had reserved the auto-inc lock for some
 		table in this SQL statement we release it now */
 
 		row_unlock_table_autoinc_for_mysql(trx);
-		}
+
 		/* Store the current undo_no of the transaction so that we
 		know where to roll back if we have to roll back the next
 		SQL statement */
@@ -1962,13 +1961,11 @@ innobase_rollback(
 
 	innobase_release_stat_resources(trx);
 
-	if (trx->auto_inc_lock) {
 	/* If we had reserved the auto-inc lock for some table (if
 	we come here to roll back the latest SQL statement) we
 	release it now before a possibly lengthy rollback */
 
 	row_unlock_table_autoinc_for_mysql(trx);
-	}
 
 	if (all
 		|| !thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {
@@ -2002,13 +1999,11 @@ innobase_rollback_trx(
 
 	innobase_release_stat_resources(trx);
 
-	if (trx->auto_inc_lock) {
 	/* If we had reserved the auto-inc lock for some table (if
 	we come here to roll back the latest SQL statement) we
 	release it now before a possibly lengthy rollback */
 
 	row_unlock_table_autoinc_for_mysql(trx);
-	}
 
 	error = trx_rollback_for_mysql(trx);
 
@@ -7135,6 +7130,7 @@ ha_innobase::innobase_read_and_init_auto_inc(
 	int		mysql_error = 0;
 	dict_table_t*	innodb_table = prebuilt->table;
 	ibool		trx_was_not_started	= FALSE;
+	ulint		error;
 
 	ut_a(prebuilt);
 	ut_a(prebuilt->table);
@@ -7155,7 +7151,11 @@ ha_innobase::innobase_read_and_init_auto_inc(
 
 	trx_search_latch_release_if_reserved(prebuilt->trx);
 
-	dict_table_autoinc_lock(prebuilt->table);
+	error = innobase_autoinc_lock();
+	if (error != DB_SUCCESS) {
+		mysql_error = 1;
+		goto err;
+	}
 
 	auto_inc = dict_table_autoinc_read(prebuilt->table);
 
@@ -7168,7 +7168,6 @@ ha_innobase::innobase_read_and_init_auto_inc(
 
 	if (auto_inc == 0) {
 		dict_index_t* index;
-		ulint error = DB_SUCCESS;
 		const char* autoinc_col_name;
 
 		ut_a(!innodb_table->autoinc_inited);
@@ -7196,6 +7195,7 @@ ha_innobase::innobase_read_and_init_auto_inc(
 
 	dict_table_autoinc_unlock(prebuilt->table);
 
+err:
 	/* Since MySQL does not seem to call autocommit after SHOW TABLE
 	STATUS (even if we would register the trx here), we commit our
 	transaction here if it was started here. This is to eliminate a
@@ -7240,12 +7240,10 @@ ha_innobase::innobase_get_auto_increment(
 				trx = prebuilt->trx;
 				dict_table_autoinc_unlock(prebuilt->table);
 
-				if (trx->auto_inc_lock) {
 				/* If we had reserved the AUTO-INC
 				lock in this SQL statement we release
 				it before retrying.*/
 				row_unlock_table_autoinc_for_mysql(trx);
-				}
 
 				/* Just to make sure */
 				ut_a(!trx->auto_inc_lock);
@@ -7287,6 +7285,7 @@ ha_innobase::get_auto_increment(
         ulonglong	*first_value,        /* out: the autoinc value */
         ulonglong	*nb_reserved_values) /* out: count of reserved values */
 {
+	trx_t*		trx;
 	ulint		error;
 	ulonglong	autoinc = 0;
 
@@ -7313,37 +7312,29 @@ ha_innobase::get_auto_increment(
 	this method for the same statement results in different values which
 	don't make sense. Therefore we store the value the first time we are
 	called and count down from that as rows are written (see write_row()).
+	*/
 
-	We make one exception, if the *first_value is precomputed by MySQL
-	we use that value. And set the number of reserved values to 1 if
-	this is the first time we were called for the SQL statement, this
-	will force MySQL to call us for the next value. If we are in the
-	middle of a multi-row insert we preserve the existing counter.*/
-	if (*first_value == 0) {
+	trx = prebuilt->trx;
 
 	/* Called for the first time ? */
-		if (prebuilt->trx->n_autoinc_rows == 0) {
+	if (trx->n_autoinc_rows == 0) {
 
-			prebuilt->trx->n_autoinc_rows = (ulint) nb_desired_values;
+		trx->n_autoinc_rows = nb_desired_values;
 
 		/* It's possible for nb_desired_values to be 0:
 		e.g., INSERT INTO T1(C) SELECT C FROM T2; */
 		if (nb_desired_values == 0) {
   
-				++prebuilt->trx->n_autoinc_rows;
-			}
+			trx->n_autoinc_rows = 1;
 		}
   
 		*first_value = autoinc;
-
-	} else if (prebuilt->trx->n_autoinc_rows == 0) {
-
-		prebuilt->trx->n_autoinc_rows = 1;
+	/* Not in the middle of a mult-row INSERT. */
+	} else if (prebuilt->last_value == 0) {
+		*first_value = autoinc;
 	}
   
-	ut_a(prebuilt->trx->n_autoinc_rows > 0);
-
-	*nb_reserved_values = prebuilt->trx->n_autoinc_rows;
+	*nb_reserved_values = trx->n_autoinc_rows;
 
 	/* With old style AUTOINC locking we only update the table's
 	AUTOINC counter after attempting to insert the row. */
@@ -7670,12 +7661,10 @@ innobase_xa_prepare(
 		/* We just mark the SQL statement ended and do not do a
 		transaction prepare */
 
-		if (trx->auto_inc_lock) {
 		/* If we had reserved the auto-inc lock for some
 		table in this SQL statement we release it now */
 
 		row_unlock_table_autoinc_for_mysql(trx);
-		}
 
 		/* Store the current undo_no of the transaction so that we
 		know where to roll back if we have to roll back the next
@@ -8026,7 +8015,7 @@ static MYSQL_SYSVAR_STR(data_file_path, innobase_data_file_path,
   NULL, NULL, NULL);
 
 static MYSQL_SYSVAR_LONG(autoinc_lock_mode, innobase_autoinc_lock_mode,
-  PLUGIN_VAR_RQCMDARG,
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
   "The AUTOINC lock modes supported by InnoDB:\n"
   "  0 => Old style AUTOINC locking (for backward compatibility)\n"
   "  1 => New style AUTOINC locking\n"

storage/innobase/row/row0sel.c

@@ -4533,7 +4533,6 @@ row_search_autoinc_read_column(
 	ibool		unsigned_type)	/* in: signed or unsigned flag */
 {
 	ulint		len;
-	byte*		ptr;
 	const byte*	data;
 	ib_longlong	value;
 	mem_heap_t*	heap = NULL;
@@ -4555,49 +4554,20 @@ row_search_autoinc_read_column(
 	ut_a(len != UNIV_SQL_NULL);
 	ut_a(len <= sizeof value);
 
-#ifdef WORDS_BIGENDIAN
 	/* Copy integer data and restore sign bit */
+	if (unsigned_type || (data[0] & 128))
+		memset(dest, 0x00, sizeof(dest));
+	else
+		memset(dest, 0xff, sizeof(dest));
 
-	memcpy((ptr = dest), data, len);
-
-	if (!unsigned_type) {
-		dest[0] ^= 128;
-	}
-#else
-	/* Convert integer data from Innobase to a little-endian format,
-	sign bit restored to normal */
-
-	for (ptr = dest + len; ptr != dest; ++data) {
-		--ptr;
-		*ptr = *data;
-	}
+	memcpy(dest + (sizeof(value) - len), data, len);
 
-	if (!unsigned_type) {
-		dest[len - 1] ^= 128;
-	}
-#endif
+	if (!unsigned_type)
+		dest[sizeof(value) - len] ^= 128;
 
 	/* The assumption here is that the AUTOINC value can't be negative.*/
-	switch (len) {
-	case 8:
-		value = *(ib_longlong*) ptr;
-		break;
-
-	case 4:
-		value = *(ib_uint32_t*) ptr;
-		break;
-
-	case 2:
-		value = *(uint16 *) ptr;
-		break;
-
-	case 1:
-		value = *ptr;
-		break;
-
-	default:
-		ut_error;
-	}
+	value = (((ib_longlong) mach_read_from_4(dest)) << 32) |
+		 ((ib_longlong) mach_read_from_4(dest + 4));        
 
 	if (UNIV_LIKELY_NULL(heap)) {
 		mem_heap_free(heap);