Django ticket 21608 test case https://code.djangoproject.com/ticket/21608 Steps to reproduce: 1. python manage.py migrate 2. python manage.py createsuperuser 3. python manage.py runserver 4. Open http://localhost:8000/admin/ in tab 1 and login. 5. Open http://localhost:8000/slow/ in tab 2. 6. Before the slow page loads (takes 10 seconds) complete the following steps: 6.1. Logout from tab 1: http://localhost:8000/admin/logout/ 6.2. Verify that http://localhost:8000/admin/ shows login form 6.3. Wait 10 seconds 6.4. Observe that http://localhost:8000/admin/ is logged in again.