When attempting to add a BMC interface to a host and the BMC has an existing lease, or trying to change either the IP or mac address of an already configured BMC interface (regular interfaces were not tested), a modal dialog appears informing you that "Conflicts have been detected". After the notice is dismissed, the "overwrite" button does not appear in place of the "submit" button. Clicking "submit" [again] repeats the the conflict notification cycle in an endless loop. Manually deleting all leases for the BMC mac address prevents the conflicts dialog from being presented and avoids entered into the endless "ack"/"submit" loop.

The easiest way to reproduce this issue is to attempt to change the mac address on an already configured BMC interface.

This issue has been observered in both 1.5.3 and 1.6.3.

Logs from attempt to change 00:25:90:d7:06:d0 to 00:25:90:d7:06:d1

production.log

Started PUT "/hosts/dec19.example.org" for 10.10.90.48 at 2014-11-24 11:34:52 -0700
Processing by HostsController#update as */*
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"rKHt0l+bplIa5bls+PM9sO2oq4Rj34jDpp+tK15a6fI=", "host"=>{"name"=>"dec19", "hostgroup_id"=>"5", "environment_id"=>"1", "puppet_ca_proxy_id"=>"2", "puppet_proxy_id"=>"2", "config_group_ids"=>["", "4"], "puppetclass_ids"=>["", "746"], "managed"=>"1", "progress_report_id"=>"[FILTERED]", "domain_id"=>"6", "realm_id"=>"", "mac"=>"00:25:90:c8:7b:82", "subnet_id"=>"1", "ip"=>"10.10.27.37", "interfaces_attributes"=>{"0"=>{"_destroy"=>"false", "mac"=>"00:25:90:d7:06:d1", "name"=>"dec19-bmc", "domain_id"=>"6", "subnet_id"=>"1", "ip"=>"10.10.27.38", "username"=>"ADMIN", "password"=>"[FILTERED]", "provider"=>"IPMI", "id"=>"21"}, "new_interfaces"=>{"_destroy"=>"false", "type"=>"Nic::Managed", "mac"=>"", "name"=>"", "domain_id"=>"", "ip"=>"", "provider"=>"IPMI"}}, "architecture_id"=>"1", "operatingsystem_id"=>"20", "medium_id"=>"6", "ptable_id"=>"26", "disk"=>"", "root_pass"=>"[FILTERED]", "is_owned_by"=>"1-Users", "enabled"=>"1", "model_id"=>"19", "comment"=>"", "overwrite"=>"false"}, "id"=>"dec19.example.org"}
DHCP records dec19-bmc.example.org-00:25:90:d7:06:d0/10.10.27.38 already exists
Failed to save: Conflict DHCP records dec19-bmc.example.org-00:25:90:d7:06:d0/10.10.27.38 already exists
  Rendered hosts/_conflicts.html.erb (0.3ms)
  Rendered hosts/_progress.html.erb (0.1ms)
  Rendered config_groups/_config_group.html.erb (7.0ms)
  Rendered config_groups/_config_group.html.erb (5.9ms)
  Rendered config_groups/_config_group.html.erb (4.6ms)
  Rendered config_groups/_config_group.html.erb (5.6ms)
  Rendered config_groups/_config_group.html.erb (6.1ms)
  Rendered config_groups/_config_group.html.erb (6.7ms)
  Rendered config_groups/_config_group.html.erb (6.3ms)
  Rendered config_groups/_config_groups_selection.html.erb (49.1ms)
  Rendered puppetclasses/_selectedClasses.html.erb (1.7ms)
  Rendered puppetclasses/_classes_in_groups.html.erb (0.6ms)

Started GET "/tasks/551687c1-b191-466c-bd33-19d4d6635435" for 10.10.90.48 at 2014-11-24 11:34:54 -0700
Processing by TasksController#show as */*
  Parameters: {"id"=>"551687c1-b191-466c-bd33-19d4d6635435"}
  Rendered tasks/_list.html.erb (0.2ms)
Completed 200 OK in 9ms (Views: 1.1ms | ActiveRecord: 0.9ms)
  Rendered puppetclasses/_classes.html.erb (1092.3ms)
  Rendered puppetclasses/_class_selection.html.erb (1198.3ms)
  Rendered common/_domain.html.erb (10.9ms)
  Rendered hosts/_interfaces.html.erb (15.8ms)
  Rendered hosts/_interfaces.html.erb (9.0ms)
  Rendered common/os_selection/_architecture.html.erb (6.8ms)
  Rendered common/os_selection/_operatingsystem.html.erb (12.5ms)
  Rendered hosts/_operating_system.html.erb (25.7ms)
  Rendered hosts/_unattended.html.erb (75.8ms)
  Rendered puppetclasses/_class_parameters.html.erb (0.0ms)
  Rendered puppetclasses/_classes_parameters.html.erb (11.5ms)
  Rendered common_parameters/_inherited_parameters.html.erb (0.2ms)
  Rendered common_parameters/_puppetclass_parameter.html.erb (2.7ms)
  Rendered common_parameters/_puppetclasses_parameters.html.erb (4.3ms)
  Rendered common_parameters/_parameter.html.erb (1.7ms)
  Rendered common_parameters/_parameters.html.erb (5.5ms)
  Rendered hosts/_form.html.erb (1342.1ms)
  Rendered hosts/edit.html.erb within layouts/application (1345.2ms)
  Rendered home/_user_dropdown.html.erb (1.7ms)
Read fragment views/tabs_and_title_records-1 (0.2ms)
  Rendered home/_topbar.html.erb (2.9ms)
  Rendered layouts/base.html.erb (4.9ms)
Completed 200 OK in 2483ms (Views: 1331.7ms | ActiveRecord: 44.7ms)

proxy.log

E, [2014-11-24T11:34:52.856723 #8655] ERROR -- : Record 10.10.27.0/00:25:90:d7:06:d1 not found
10.10.27.4 - - [24/Nov/2014 11:34:52] "GET /10.10.27.0/00:25:90:d7:06:d1 HTTP/1.1" 404 47 0.0812
10.10.27.4 - - [24/Nov/2014 11:34:53] "GET /10.10.27.0/10.10.27.38 HTTP/1.1" 200 122 0.1534
E, [2014-11-24T11:34:53.202950 #8655] ERROR -- : Record 10.10.27.0/00:25:90:d7:06:d1 not found
10.10.27.4 - - [24/Nov/2014 11:34:53] "GET /10.10.27.0/00:25:90:d7:06:d1 HTTP/1.1" 404 47 0.0781
10.10.27.4 - - [24/Nov/2014 11:34:53] "GET /10.10.27.0/10.10.27.38 HTTP/1.1" 200 122 0.0721
10.10.27.4 - - [24/Nov/2014 11:34:53] "GET /serverName HTTP/1.1" 200 29 0.0005
10.10.27.4 - - [24/Nov/2014 11:34:53] "GET /10.10.27.0/00:25:90:c8:7b:82 HTTP/1.1" 200 170 0.0822
10.10.27.4 - - [24/Nov/2014 11:34:53] "GET /10.10.27.0/10.10.27.37 HTTP/1.1" 200 170 0.1360