It processed a lot of hosts successfully, then hangs (repeatably).

After waiting 90 minutes, I ^C'd the import:

processing platform21.bar.foo.com DONE
^Crake aborted!

/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:865:in `=~'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:865:in `validates_format_of'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:468:in `validates_each'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:465:in `each'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:465:in `validates_each'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:182:in `call'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:182:in `evaluate_method'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:166:in `call'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `run'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `each'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `send'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `run'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:276:in `run_callbacks'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:1098:in `valid_without_callbacks?'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/callbacks.rb:315:in `valid?'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/autosave_association.rb:256:in `association_valid?'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/autosave_association.rb:245:in `validate_collection_association'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/autosave_association.rb:245:in `each'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/autosave_association.rb:245:in `validate_collection_association'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/autosave_association.rb:174:in `validate_associated_records_for_host_parameters'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:180:in `evaluate_method'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:180:in `evaluate_method'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:180:in `instance_eval'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:180:in `evaluate_method'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:166:in `call'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `run'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `each'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `send'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `run'
/opt/foreman-head/vendor/rails/activesupport/lib/active_support/callbacks.rb:276:in `run_callbacks'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:1098:in `valid_without_callbacks?'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/callbacks.rb:315:in `valid?'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/validations.rb:1077:in `save_without_dirty'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/dirty.rb:79:in `save_without_transactions'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:229:in `send'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:229:in `with_transaction_returning_status'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:182:in `transaction'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:228:in `with_transaction_returning_status'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:196:in `save_without_unsaved_flag'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:208:in `rollback_active_record_state!'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/transactions.rb:196:in `save_without_unsaved_flag'
/opt/foreman-head/vendor/plugins/active_scaffold/lib/extensions/unsaved_record.rb:15:in `save'
/opt/foreman-head/app/models/host.rb:329:in `importNode'
/opt/foreman-head/lib/tasks/puppet.rake:71
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/batches.rb:26:in `find_each'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/batches.rb:26:in `each'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/batches.rb:26:in `find_each'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/batches.rb:66:in `find_in_batches'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/base.rb:2143:in `with_scope'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/batches.rb:62:in `find_in_batches'
/opt/foreman-head/vendor/rails/activerecord/lib/active_record/batches.rb:25:in `find_each'
/opt/foreman-head/lib/tasks/puppet.rake:67
/usr/lib/ruby/1.8/rake.rb:617:in `call'
/usr/lib/ruby/1.8/rake.rb:617:in `execute'
/usr/lib/ruby/1.8/rake.rb:612:in `each'
/usr/lib/ruby/1.8/rake.rb:612:in `execute'
/usr/lib/ruby/1.8/rake.rb:578:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/lib/ruby/1.8/rake.rb:571:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/rake.rb:564:in `invoke'
/usr/lib/ruby/1.8/rake.rb:2027:in `invoke_task'
/usr/lib/ruby/1.8/rake.rb:2005:in `top_level'
/usr/lib/ruby/1.8/rake.rb:2005:in `each'
/usr/lib/ruby/1.8/rake.rb:2005:in `top_level'
/usr/lib/ruby/1.8/rake.rb:2044:in `standard_exception_handling'
/usr/lib/ruby/1.8/rake.rb:1999:in `top_level'
/usr/lib/ruby/1.8/rake.rb:1977:in `run'
/usr/lib/ruby/1.8/rake.rb:2044:in `standard_exception_handling'
/usr/lib/ruby/1.8/rake.rb:1974:in `run'
/usr/bin/rake:28
processing appserver31.bar.foo.com