A project to serve as a starting point for reliably reproducing the error in Django issue 22420. Tested on Django 1.11.1 with Postgres 9.4.11, 2014 MacBook Air.

This project has a simple model MyModel and an added context_processor that performs a database query. The test case uses threading and TransactionTestCase to reproduce the following error when the test suite cleans up (session count varies):

django.db.utils.OperationalError: database "test_my_postgres_db" is being accessed by other users
DETAIL:  There are 8 other sessions using the database.

It doesn't matter if an instance of the model exists or not (see concurrency.migrations.0001_initial.py), or if the connections cleanup decorator workaround from 22420 is added (see concurrency.tests.py).

Just run python manage.py test to reproduce!