When we upgrade the mariadb from 10.3.13 to 10.3.36, we found memory leak in mysql_upgrade.

//  Run the build.sh file and specify the basedir

$ sh build.sh  -d  /flash3/mariadb_data/mysql

// Install dependencies

$ make install

// initialization

$ /flash3/mariadb_10_3_13/scripts/mysql_install_db --basedir='/flash3/mariadb_data/mysql' --datadir='/flash3/mariadb_data/data'

// Create an instance using port 1235

$ /flash3/mariadb_10_3_13/sql/mysqld --basedir=/flash3/mariadb_data/mysql --datadir=/flash3/mariadb_data/data --port=1235 --socket=/flash3/mariadb_data/mysql/mysql.sock&

// Connect into a mysqld instance by root

$ mysql -h127.0.0.1 -P1234 -uroot

MariaDB> create database test_1;

MariaDB> use test_1;

MariaDB> create table t(a int);

MariaDB> insert into t values(1),(2);

MariaDB> shutdown;

// Compile the code of mariadb-10.3.36 by using the build.sh file.

$ sh build.sh

// Create an instance in the same directory with mariadb-10.3.13. And use the port 1246.

$ flash3/mariadb_10_3_36/sql/mysqld --basedir=/flash3/mariadb_data/mysql --datadir=/flash3/mariadb_data/data --port=1246 --socket=/flash3/mariadb_data/mysql/mysql.sock&

$ /flash3/mariadb_10_3_36/client/mysql_upgrade -uroot -p -S /flash3/mariadb_data/mysql/mysql.sock

Phase 1/7: Checking and upgrading mysql database

Processing databases

mysql

mysql.column_stats                                 OK

mysql.columns_priv                                 OK

mysql.db                                           OK

mysql.event                                        OK

mysql.func                                         OK

mysql.gtid_slave_pos                               OK

mysql.help_category                                OK

mysql.help_keyword                                 OK

mysql.help_relation                                OK

mysql.help_topic                                   OK

mysql.host                                         OK

mysql.index_stats                                  OK

mysql.innodb_index_stats                           OK

mysql.innodb_table_stats                           OK

mysql.plugin                                       OK

mysql.proc                                         OK

mysql.procs_priv                                   OK

mysql.proxies_priv                                 OK

mysql.roles_mapping                                OK

mysql.servers                                      OK

mysql.table_stats                                  OK

mysql.tables_priv                                  OK

mysql.time_zone                                    OK

mysql.time_zone_leap_second                        OK

mysql.time_zone_name                               OK

mysql.time_zone_transition                         OK

mysql.time_zone_transition_type                    OK

mysql.transaction_registry                         OK

mysql.user                                         OK

Phase 2/7: Installing used storage engines... Skipped

Phase 3/7: Fixing views

Phase 4/7: Running 'mysql_fix_privilege_tables'

Phase 5/7: Fixing table and database names

Phase 6/7: Checking and upgrading tables

Processing databases

information_schema

performance_schema

test

test_1

test_1.t                                           OK

Phase 7/7: Running 'FLUSH PRIVILEGES'

OK

Warning:    8 bytes lost at 0x7fb713508af0, allocated by T@0 at 0x7fb712b05b14, mysys/my_malloc.c:246, mysys/get_password.c:204, 0x7fb7111c1555, 0x7fb712ae3889

Memory lost: 8 bytes in 1 chunks