switching mysql from 5.6 to 5.7 breaking tests ( mysql connection gone )

I have a django test case where multiprocessing.Process is in use. but one test is failing on mysql5.7 it was working fine on mysql5.6.

I am using mysql57 container and running tests from other docker container.

During the test it gives error MySQLdb._exceptions.OperationalError: (2013, 'Lost connection to MySQL server during query')

Is there any breaking change occur in mysql5.7 ?