libmariadbclient18 + MySQL-python leaks memory on failed connections

#!/usr/bin/env python

import resource

import time

import MySQLdb

print("Client version: %s" % MySQLdb.get_client_info())

max_allowed_rss = 512*1024

failed_connects = 0

initial_rss = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss

for _ in xrange(50000):

    try:

        MySQLdb.connect(user='root', host='127.0.0.1')

    except MySQLdb.Error:

        failed_connects += 1

print("maxrss initial was: %sKB, final is %sKB; %.2fMiB change after %d failed connections." %

        (

        initial_rss,

        resource.getrusage(resource.RUSAGE_SELF).ru_maxrss,

        (resource.getrusage(resource.RUSAGE_SELF).ru_maxrss - initial_rss) / 1024.0,

        failed_connects

        )

    )

$ apt-get install libmysqlclient18=5.5.50-0+deb8u1

$ python mdev10455_mysqldb_memleak.py

Client version: 5.5.50

maxrss initial was: 8364KB, final is 10044KB; 1.64MiB change after 50000 failed connections.

$ apt-get install libmysqlclient18=5.6.30-1~bpo8+1

$ python mdev10455_mysqldb_memleak.py

Client version: 5.6.30

maxrss initial was: 8536KB, final is 10216KB; 1.64MiB change after 50000 failed connections.

$ apt-get install libmysqlclient18=10.1.16+maria-1~jessie

$ python mdev10455_mysqldb_memleak.py

Client version: 10.1.16-MariaDB

maxrss initial was: 9272KB, final is 437896KB; 418.58MiB change after 50000 failed connections.