centos7 kilo dashborad登录成功后等session失效后，再登录报错

centos7 kilo dashborad用admin成功登录后，过上一会等session失效后，在用任何账号登录报错，

控制节点的httpd的error.log日志

Login successful for user "demo".
Internal Server Error: /dashboard/auth/login/
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/site-packages/django/views/decorators/debug.py", line 76, in sensitive_post_parameters_wrapper
return view(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 110, in _wrapped_view
response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/openstack_auth/views.py", line 111, in login
**kwargs)
  File "/usr/lib/python2.7/site-packages/django/views/decorators/debug.py", line 76, in sensitive_post_parameters_wrapper
return view(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 110, in _wrapped_view
response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/contrib/auth/views.py", line 51, in login
auth_login(request, form.get_user())
  File "/usr/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 102, in login
if _get_user_session_key(request) != user.pk or (
  File "/usr/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 59, in _get_user_session_key
return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY])
  File "/usr/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 969, in to_python
params={'value': value},
ValidationError: [u'\\u20191b23b9593b73436ca4576c7f8090b826\\u2018 \\u5fc5\\u987b\\u4e3a\\u6574\\u6570\\u3002']