/usr/lib/ruby/vendor_ruby/ is in ruby-amq-client 0.9.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/amq/
/usr/lib/ruby/vendor_ruby/amq/protocol/
/usr/lib/ruby/vendor_ruby/amq/protocol/get_response.rb
/usr/lib/ruby/vendor_ruby/amq/client/
/usr/lib/ruby/vendor_ruby/amq/client/extensions/
/usr/lib/ruby/vendor_ruby/amq/client/extensions/rabbitmq/
/usr/lib/ruby/vendor_ruby/amq/client/extensions/rabbitmq/confirm.rb
/usr/lib/ruby/vendor_ruby/amq/client/extensions/rabbitmq/basic.rb
/usr/lib/ruby/vendor_ruby/amq/client/extensions/rabbitmq.rb
/usr/lib/ruby/vendor_ruby/amq/client/adapters/
/usr/lib/ruby/vendor_ruby/amq/client/adapters/event_machine.rb
/usr/lib/ruby/vendor_ruby/amq/client/adapters/coolio.rb
/usr/lib/ruby/vendor_ruby/amq/client/settings.rb
/usr/lib/ruby/vendor_ruby/amq/client/entity.rb
/usr/lib/ruby/vendor_ruby/amq/client/callbacks.rb
/usr/lib/ruby/vendor_ruby/amq/client/channel.rb
/usr/lib/ruby/vendor_ruby/amq/client/exceptions.rb
/usr/lib/ruby/vendor_ruby/amq/client/handlers_registry.rb
/usr/lib/ruby/vendor_ruby/amq/client/exchange.rb
/usr/lib/ruby/vendor_ruby/amq/client/adapter.rb
/usr/lib/ruby/vendor_ruby/amq/client/consumer_tag_generator.rb
/usr/lib/ruby/vendor_ruby/amq/client/openable.rb
/usr/lib/ruby/vendor_ruby/amq/client/version.rb
/usr/lib/ruby/vendor_ruby/amq/client/framing/
/usr/lib/ruby/vendor_ruby/amq/client/framing/string/
/usr/lib/ruby/vendor_ruby/amq/client/framing/string/frame.rb
/usr/lib/ruby/vendor_ruby/amq/client/framing/io/
/usr/lib/ruby/vendor_ruby/amq/client/framing/io/frame.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/
/usr/lib/ruby/vendor_ruby/amq/client/async/extensions/
/usr/lib/ruby/vendor_ruby/amq/client/async/extensions/rabbitmq/
/usr/lib/ruby/vendor_ruby/amq/client/async/extensions/rabbitmq/confirm.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/extensions/rabbitmq/basic.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/consumer.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/adapters/
/usr/lib/ruby/vendor_ruby/amq/client/async/adapters/event_machine.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/adapters/coolio.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/adapters/eventmachine.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/entity.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/callbacks.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/channel.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/exchange.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/adapter.rb
/usr/lib/ruby/vendor_ruby/amq/client/async/queue.rb
/usr/lib/ruby/vendor_ruby/amq/client/logging.rb
/usr/lib/ruby/vendor_ruby/amq/client/server_named_entity.rb
/usr/lib/ruby/vendor_ruby/amq/client/queue.rb
/usr/lib/ruby/vendor_ruby/amq/client.rb