Libvirt Fog issues ActiveRecord::RecordNotFound

Problem:

Since version 1.15, and now with version 1.19.1, when deploying a new libvirt virtual host, or sometimes doing not much at all, we try to use the Console button, and get an error “ActiveRecord::RecordNotFound”

Then usually the “Console” button on a Virtual machine’s dashboard page goes missing and we get an “Unknown Power State”.

Expected outcome:

To not get ActiveRecord::RecordNotFound issues every single time I use Foreman.

Foreman and Proxy versions:

1.19.1

Foreman and Proxy plugin versions:

foreman_discovery MaaS Discovery Plugin engine for Foreman alongoldboim, Alon Goldboim, amirfefer, Amit Karsale, Amos Benari, Avi Sharvit, Bryan Kearney, bshuster, Daniel Lobato, Daniel Lobato Garcia, Daniel Lobato García, Danny Smit, David Davis, Dominic Cleal, Eric D. Helms, Ewoud Kohl van Wijngaarden, Frank Wall, Greg Sutcliffe, ChairmanTubeAmp, Ido Kanner, imriz, Imri Zvik, Joseph Mitchell Magen, June Zhang, kgaikwad, Lars Berntzon, ldjebran, Lukas Zapletal, Lukáš Zapletal, Marek Hulan, Marek Hulán, Martin Bačovský, Matt Jarvis, Michael Moll, Nick, odovzhenko, Ohad Levy, Ondrej Prazak, Ori Rabin, orrabin, Partha Aji, Petr Chalupa, Phirince Philip, Rahul Bajaj, Robert Antoni Buj Gelonch, Scubafloyd, Sean O’Keeffe, Sebastian Gräßl, Shimon Shtein, Shlomi Zadok, Stephen Benjamin, Swapnil Abnave, Thomas Gelf, Timo Goebel, Tomas Strych, Tom Caspy, Tomer Brisker, and Yann Cézard 13.0.1
foreman_hooks Plugin engine for Foreman that enables running custom hook scripts on Foreman events Dominic Cleal 0.3.14
foreman_snapshot_management Foreman-plugin to manage snapshots in a vSphere environment. ATIX AG 1.5.0
foreman_templates Engine to synchronise provisioning templates from GitHub Greg Sutcliffe 6.0.3
foreman_vmwareannotations This plug-in copies the host comment to VMWare annotations in The Foreman. Timo Goebel 0.0.1

Other relevant data:
[e.g. logs from Foreman and/or the Proxy, modified templates, commands issued, etc]
(for logs, surround with three back-ticks to get proper formatting, e.g.)

2018-11-16T18:21:24 [W|app|fbd98] Failed retrieving libvirt vm by uuid 105f710f-eacf-4a6e-93bf-d6e6d560351a
Libvirt::RetrieveError: Call to virDomainLookupByUUID failed: internal error: client socket is closed
/opt/theforeman/tfm/root/usr/share/gems/gems/fog-libvirt-0.4.1/lib/fog/libvirt/requests/compute/list_domains.rb:9:in `lookup_domain_by_uuid'
/opt/theforeman/tfm/root/usr/share/gems/gems/fog-libvirt-0.4.1/lib/fog/libvirt/requests/compute/list_domains.rb:9:in `list_domains'
/opt/theforeman/tfm/root/usr/share/gems/gems/fog-libvirt-0.4.1/lib/fog/libvirt/models/compute/servers.rb:15:in `get'
/usr/share/foreman/app/models/compute_resource.rb:181:in `find_vm_by_uuid'
/usr/share/foreman/app/models/compute_resources/foreman/model/libvirt.rb:40:in `find_vm_by_uuid'
/usr/share/foreman/app/controllers/hosts_controller.rb:304:in `vm'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/base.rb:186:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/rendering.rb:30:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:108:in `block in run_callbacks'
/usr/share/foreman/app/controllers/concerns/application_shared.rb:15:in `set_timezone'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/usr/share/foreman/app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/usr/share/foreman/app/controllers/concerns/foreman/controller/topbar_sweeper.rb:12:in `set_topbar_sweeper_controller'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/opt/theforeman/tfm/root/usr/share/gems/gems/audited-4.7.1/lib/audited/sweeper.rb:14:in `around'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/opt/theforeman/tfm/root/usr/share/gems/gems/audited-4.7.1/lib/audited/sweeper.rb:14:in `around'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:135:in `run_callbacks'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/callbacks.rb:19:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/rescue.rb:20:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/notifications.rb:166:in `block in instrument'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/notifications.rb:166:in `instrument'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/params_wrapper.rb:252:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activerecord-5.1.6/lib/active_record/railties/controller_runtime.rb:22:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/base.rb:124:in `process'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionview-5.1.6/lib/action_view/rendering.rb:30:in `process'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal.rb:189:in `dispatch'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal.rb:253:in `dispatch'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/routing/route_set.rb:49:in `dispatch'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/routing/route_set.rb:31:in `serve'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/journey/router.rb:50:in `block in serve'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/journey/router.rb:33:in `each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/journey/router.rb:33:in `serve'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/routing/route_set.rb:844:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/lib/apipie/static_dispatcher.rb:65:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/lib/apipie/extractor/recorder.rb:136:in `call'
/usr/share/foreman/lib/middleware/telemetry.rb:9:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/lib/apipie/middleware/checksum_in_headers.rb:27:in `call'
/usr/share/foreman/lib/middleware/catch_json_parse_errors.rb:8:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/etag.rb:25:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/conditional_get.rb:25:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/head.rb:12:in `call'
/usr/share/foreman/lib/middleware/logging_context.rb:23:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/session/abstract/id.rb:232:in `context'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/session/abstract/id.rb:226:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/cookies.rb:613:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/callbacks.rb:26:in `block in call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:97:in `run_callbacks'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/callbacks.rb:24:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/debug_exceptions.rb:59:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/rack/logger.rb:36:in `call_app'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/rack/logger.rb:26:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-rails-3.2.1/lib/sprockets/rails/quiet_assets.rb:13:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/request_id.rb:25:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/method_override.rb:22:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/runtime.rb:22:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/cache/strategy/local_cache_middleware.rb:27:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/executor.rb:12:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/static.rb:125:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/sendfile.rb:111:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/secure_headers-5.0.5/lib/secure_headers/middleware.rb:13:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/engine.rb:522:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/railtie.rb:185:in `public_send'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/railtie.rb:185:in `method_missing'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/urlmap.rb:68:in `block in call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/urlmap.rb:53:in `each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/urlmap.rb:53:in `call'
/usr/share/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:149:in `accept_and_process_next_request'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:110:in `main_loop'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler.rb:415:in `block (3 levels) in start_threads'
/usr/share/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'
/opt/theforeman/tfm/root/usr/share/gems/gems/logging-2.2.2/lib/logging/diagnostic_context.rb:474:in `block in create_with_logging_context'
2018-11-16T18:21:24 [W|app|fbd98] Failed to fetch vm information
ActiveRecord::RecordNotFound: ActiveRecord::RecordNotFound
/usr/share/foreman/app/models/compute_resources/foreman/model/libvirt.rb:43:in `rescue in find_vm_by_uuid'
/usr/share/foreman/app/models/compute_resources/foreman/model/libvirt.rb:39:in `find_vm_by_uuid'
/usr/share/foreman/app/controllers/hosts_controller.rb:304:in `vm'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/base.rb:186:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/rendering.rb:30:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:108:in `block in run_callbacks'
/usr/share/foreman/app/controllers/concerns/application_shared.rb:15:in `set_timezone'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/usr/share/foreman/app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/usr/share/foreman/app/controllers/concerns/foreman/controller/topbar_sweeper.rb:12:in `set_topbar_sweeper_controller'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/opt/theforeman/tfm/root/usr/share/gems/gems/audited-4.7.1/lib/audited/sweeper.rb:14:in `around'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/opt/theforeman/tfm/root/usr/share/gems/gems/audited-4.7.1/lib/audited/sweeper.rb:14:in `around'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:117:in `block in run_callbacks'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:135:in `run_callbacks'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/callbacks.rb:19:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/rescue.rb:20:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/notifications.rb:166:in `block in instrument'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/notifications.rb:166:in `instrument'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal/params_wrapper.rb:252:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activerecord-5.1.6/lib/active_record/railties/controller_runtime.rb:22:in `process_action'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/abstract_controller/base.rb:124:in `process'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionview-5.1.6/lib/action_view/rendering.rb:30:in `process'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal.rb:189:in `dispatch'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_controller/metal.rb:253:in `dispatch'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/routing/route_set.rb:49:in `dispatch'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/routing/route_set.rb:31:in `serve'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/journey/router.rb:50:in `block in serve'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/journey/router.rb:33:in `each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/journey/router.rb:33:in `serve'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/routing/route_set.rb:844:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/lib/apipie/static_dispatcher.rb:65:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/lib/apipie/extractor/recorder.rb:136:in `call'
/usr/share/foreman/lib/middleware/telemetry.rb:9:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/lib/apipie/middleware/checksum_in_headers.rb:27:in `call'
/usr/share/foreman/lib/middleware/catch_json_parse_errors.rb:8:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/etag.rb:25:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/conditional_get.rb:25:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/head.rb:12:in `call'
/usr/share/foreman/lib/middleware/logging_context.rb:23:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/session/abstract/id.rb:232:in `context'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/session/abstract/id.rb:226:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/cookies.rb:613:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/callbacks.rb:26:in `block in call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/callbacks.rb:97:in `run_callbacks'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/callbacks.rb:24:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/debug_exceptions.rb:59:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/rack/logger.rb:36:in `call_app'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/rack/logger.rb:26:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-rails-3.2.1/lib/sprockets/rails/quiet_assets.rb:13:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/request_id.rb:25:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/method_override.rb:22:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/runtime.rb:22:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.6/lib/active_support/cache/strategy/local_cache_middleware.rb:27:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/executor.rb:12:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionpack-5.1.6/lib/action_dispatch/middleware/static.rb:125:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/sendfile.rb:111:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/secure_headers-5.0.5/lib/secure_headers/middleware.rb:13:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/engine.rb:522:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/railtie.rb:185:in `public_send'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/railties-5.1.6/lib/rails/railtie.rb:185:in `method_missing'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/urlmap.rb:68:in `block in call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/urlmap.rb:53:in `each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/rack-2.0.3/lib/rack/urlmap.rb:53:in `call'
/usr/share/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:149:in `accept_and_process_next_request'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:110:in `main_loop'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler.rb:415:in `block (3 levels) in start_threads'
/usr/share/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'
/opt/theforeman/tfm/root/usr/share/gems/gems/logging-2.2.2/lib/logging/diagnostic_context.rb:474:in `block in create_with_logging_context'
2018-11-16T18:21:24 [I|app|fbd98]   Rendered common/_ajax_error.html.erb (0.6ms)
2018-11-16T18:21:24 [I|app|fbd98] Completed 500 Internal Server Error in 170ms (Views: 1.2ms | ActiveRecord: 154.6ms)

FWIW, every time this happens, which is multiple times a day, I have to restart foreman entirely with foreman-rake db:migrate, this is ridiculous.

This sounds like there is possibly an issue with your libvirt configuration or possibly some firewall or similar issues, since the error indicated that the client socket is closed for the VM. Have you tried going over the libvirt section of the manual to make sure you didn’t miss something?
Having to run db:migrate doesn’t make any sense, even if for some reason foreman crashes completely, you don’t need to migrate again every time. This is a procedure that is only needed during upgrades.

I’ve been working with this for a year, and I swear I’ve gone over that libvirt section of the manual many times, and just went over it again to be absolutely sure I didn’t miss anything. I’m not sure why I have to run db:migrate, my only thoughts are something is happening with MySQL that maybe breaks rails, because I can see in v1.19.1 sometimes this error happens, socket problem in the logs, and then a few minutes later I can go back to All Hosts, open the host again and console/everything works fine. It sounds like the older version of Foreman may be experiencing a greater problem, why should simple socket communication break it entirely for all hosts permanently until a db:migrate?

That’s what sounds so strange to me - db:migrate should be a no-op on a migrated database, so it doesn’t make sense that it’s required after this occurs. Nor should a connection error to a libvirt host cause the whole system to crash.