Fixed bug #27650:

INSERT into InnoDB table may cause "ERROR 1062 (23000): Duplicate entry..."
errors or lost records after multi-row INSERT of the form:
"INSERT INTO t (id...) VALUES (NULL...) ON DUPLICATE KEY UPDATE id=VALUES(id)",
where "id" is an AUTO_INCREMENT column.

It happens because InnoDB handler forgets to save next insert id after
updating of auto_increment column with new values. As result of that
last insert id stored inside InnoDB dictionary tables differs from it's
cached thd->next_insert_id value.

mysql-test/r/innodb_mysql.result

@@ -446,4 +446,43 @@ a
 2
 5
 drop table t1;
+create table t1(
+id int auto_increment,
+c char(1) not null,
+counter int not null default 1,
+primary key (id),
+unique key (c)
+) engine=innodb;
+insert into t1 (id, c) values
+(NULL, 'a'),
+(NULL, 'a')
+on duplicate key update id = values(id), counter = counter + 1;
+select * from t1;
+id	c	counter
+2	a	2
+insert into t1 (id, c) values
+(NULL, 'b')
+on duplicate key update id = values(id), counter = counter + 1;
+select * from t1;
+id	c	counter
+2	a	2
+3	b	1
+truncate table t1;
+insert into t1 (id, c) values (NULL, 'a');
+select * from t1;
+id	c	counter
+1	a	1
+insert into t1 (id, c) values (NULL, 'b'), (NULL, 'b')
+on duplicate key update id = values(id), c = values(c), counter = counter + 1;
+select * from t1;
+id	c	counter
+1	a	1
+3	b	2
+insert into t1 (id, c) values (NULL, 'a')
+on duplicate key update id = values(id), c = values(c), counter = counter + 1;
+select * from t1;
+id	c	counter
+3	b	2
+4	a	2
+drop table t1;
 End of 5.0 tests

mysql-test/t/innodb_mysql.test

@@ -412,4 +412,51 @@ DROP TABLE t1;
 
 --source include/innodb_rollback_on_timeout.inc
 
+
+-- source include/have_innodb.inc
+
+#
+# Bug #27650: INSERT fails after multi-row INSERT of the form:
+# INSERT INTO t (id...) VALUES (NULL...) ON DUPLICATE KEY UPDATE id=VALUES(id)
+#
+
+create table t1(
+id int auto_increment,
+c char(1) not null,
+counter int not null default 1,
+primary key (id),
+unique key (c)
+) engine=innodb;
+
+insert into t1 (id, c) values
+(NULL, 'a'),
+(NULL, 'a')
+on duplicate key update id = values(id), counter = counter + 1;
+
+select * from t1;
+
+insert into t1 (id, c) values
+(NULL, 'b')
+on duplicate key update id = values(id), counter = counter + 1;
+
+select * from t1;
+
+truncate table t1;
+
+insert into t1 (id, c) values (NULL, 'a');
+
+select * from t1;
+
+insert into t1 (id, c) values (NULL, 'b'), (NULL, 'b')
+on duplicate key update id = values(id), c = values(c), counter = counter + 1;
+
+select * from t1;
+
+insert into t1 (id, c) values (NULL, 'a')
+on duplicate key update id = values(id), c = values(c), counter = counter + 1;
+
+select * from t1;
+
+drop table t1;
+
 --echo End of 5.0 tests

sql/ha_innodb.cc

@@ -3299,6 +3299,8 @@ no_commit:
         if (error == DB_DUPLICATE_KEY && auto_inc_used
             && (user_thd->lex->sql_command == SQLCOM_REPLACE
                 || user_thd->lex->sql_command == SQLCOM_REPLACE_SELECT
+                || (user_thd->lex->sql_command == SQLCOM_INSERT
+                    && user_thd->lex->duplicates == DUP_UPDATE)
                 || (user_thd->lex->sql_command == SQLCOM_LOAD
                     && user_thd->lex->duplicates == DUP_REPLACE))) {