Random auth_permission + content_type errors during test runs

I've got a project running Django 1.4, Postgres 3, Python 2.7. Our tests get about halfway through, then we get a sudden flood of errors showing that the django_content_type table may be empty:

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Once the errors stop, they continue to the end of the test run. Here's the traceback for all of the errors:

Traceback (most recent call last):

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/test/testcases.py", line 502, in __call__

self._pre_setup()

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/test/testcases.py", line 463, in _pre_setup

self._fixture_setup()

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/test/testcases.py", line 475, in _fixture_setup

call_command('flush', verbosity=0, interactive=False, database=db)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 150, in call_command

return klass.execute(*args, **defaults)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/raven/contrib/django/management/__init__.py", line 37, in new_execute

return original_func(self, *args, **kwargs)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute

output = self.handle(*args, **options)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/core/management/base.py", line 371, in handle

return self.handle_noargs(**options)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/core/management/commands/flush.py", line 77, in handle_noargs

emit_post_sync_signal(set(all_models), verbosity, interactive, db)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/core/management/sql.py", line 189, in emit_post_sync_signal

interactive=interactive, db=db)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 172, in send

response = receiver(signal=self, sender=sender, **named)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/contrib/auth/management/__init__.py", line 54, in create_permissions

auth_app.Permission.objects.bulk_create(objs)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/db/models/manager.py", line 140, in bulk_create

return self.get_query_set().bulk_create(*args, **kwargs)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/db/models/query.py", line 421, in bulk_create

transaction.commit(using=self.db)

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/db/transaction.py", line 153, in commit

connection.commit()

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/db/backends/__init__.py", line 234, in commit

self._commit()

File "/home/cbweb/.virtualenvs/coursebook/local/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 235, in _commit

return self.connection.commit()

IntegrityError: insert or update on table "auth_permission" violates foreign key constraint "content_type_id_refs_id_728de91f"

DETAIL: Key (content_type_id)=(1) is not present in table "django_content_type".

This is pretty bizarre, but it's probably something we're doing. Has anyone ran into something like this before? I can't find anywhere that we're deleting content types (which the error seems to suggest is happening).

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