New test case

mysql-test/t/partition.test

@@ -1009,4 +1009,21 @@ select auto_increment from information_schema.tables where table_name='t1';
 select * from t1;
 drop table t1;
 
+#
+# BUG 19122 Crash after ALTER TABLE t1 REBUILD PARTITION p1
+#
+create table t1 (a int)
+partition by key (a)
+(partition p1 engine = innodb);
+
+alter table t1 rebuild partition p1;
+alter table t1 rebuild partition p1;
+alter table t1 rebuild partition p1;
+alter table t1 rebuild partition p1;
+alter table t1 rebuild partition p1;
+alter table t1 rebuild partition p1;
+alter table t1 rebuild partition p1;
+
+drop table t1;
+
 --echo End of 5.1 tests