[1.9.1] trying to save an overlapping network in the cluster generates ugly 500

[David Britton]

Plain text on the ui "internal server error" and I had to dig the error out of the log file:

2016-04-28 02:44:42 [HTTPChannel,1,127.0.0.1] 500 Error - /MAAS/clusters/a42ffe80-031a-4f5b-8ed2-dac71bbd26c0/interfaces/add/
        Traceback (most recent call last):
          File "/usr/lib/python2.7/dist-packages/django/core/handlers/wsgi.py", line 206, in __call__
            response = self.get_response(request)
          File "/usr/lib/python2.7/dist-packages/maasserver/utils/views.py", line 236, in get_response
            response = get_response(request)
          File "/usr/lib/python2.7/dist-packages/maasserver/utils/views.py", line 210, in get_response
            return django_get_response(request)
          File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 194, in get_response
            response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
        --- <exception caught here> ---
          File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 112, in get_response
            response = wrapped_callback(request, *callback_args, **callback_kwargs)
          File "/usr/lib/python2.7/dist-packages/maasserver/utils/views.py", line 189, in view_atomic_with_post_commit_savepoint
            return view_atomic(*args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/django/db/transaction.py", line 339, in inner
            return func(*args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/django/contrib/auth/decorators.py", line 22, in _wrapped_view
            return view_func(request, *args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in view
            return self.dispatch(request, *args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 87, in dispatch
            return handler(request, *args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/django/views/generic/edit.py", line 205, in post
            return super(BaseCreateView, self).post(request, *args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/django/views/generic/edit.py", line 171, in post
            return self.form_valid(form)
          File "/usr/lib/python2.7/dist-packages/maasserver/views/clusters.py", line 178, in form_valid
            self.object = form.save()
          File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1723, in save
            interface.save()
          File "/usr/lib/python2.7/dist-packages/maasserver/models/cleansave.py", line 37, in save
            self.full_clean()
          File "/usr/lib/python2.7/dist-packages/django/db/models/base.py", line 950, in full_clean
            raise ValidationError(errors)
        django.core.exceptions.ValidationError: {u'ip': [u"This interface's network must not overlap with other networks on this cluster."], u'subnet_mask': [u"This interface's network must not overlap with other networks on this cluster."]}

[Andres Rodriguez (andreserl)]

We believe that this is not longer an issue in the latest releases of MAAS. If you believe this is still an issue, please re-open this bug report and target it accordingly.