id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
26492	"""./manage.py migrate"" causes ""maximum recursion depth exceeded"" error"	Berker Peksag	Berker Peksag	"With the latest master (`0247c9b08f8da4a2d93b9cede6c615011552b55a`), I'm getting the following exception:

{{{

[snipped]

  File ""/home/berker/projects/django/django/core/management/commands/migrate.py"", line 62, in _run_checks
    issues.extend(super(Command, self).check(**kwargs))
  File ""/home/berker/projects/django/django/core/management/base.py"", line 385, in check
    include_deployment_checks=include_deployment_checks,
  File ""/home/berker/projects/django/django/core/management/commands/migrate.py"", line 61, in _run_checks
    issues = run_checks(tags=[Tags.database])
  File ""/home/berker/projects/django/django/core/checks/registry.py"", line 81, in run_checks
    new_errors = check(app_configs=app_configs)
  File ""/home/berker/projects/django/django/core/checks/database.py"", line 9, in check_database_backends
    for conn in connections.all():
  File ""/home/berker/projects/django/django/db/utils.py"", line 226, in all
    return [self[alias] for alias in self]
RuntimeError: maximum recursion depth exceeded
}}}

I created a sample project to demonstrate the bug: https://bitbucket.org/berkerpeksag/django-bug You can see the full output of `./manage.py migrate` at https://bitbucket.org/berkerpeksag/django-bug/src/b527f36d15c4e68168621dd39db164a8beaf905e/tdj/log.txt?at=master&fileviewer=file-view-default

The project is simple. I only created a model: https://bitbucket.org/berkerpeksag/django-bug/src/b527f36d15c4e68168621dd39db164a8beaf905e/tdj/polls/models.py?at=master&fileviewer=file-view-default

I believe the cause of the issue is at https://github.com/django/django/commit/0d3c616fbb2f49fa7ff6809e5a6777275352b35b#diff-e835ddfb52774b39749788a0d046e477R62 If I replace line 62 with

{{{
issues.extend(super(Command, self)._run_checks(**kwargs))
}}}

it works as expected."	Bug	closed	Migrations	dev	Release blocker	fixed		Berker Peksag _@…	Ready for checkin	1	0	0	0	0	0