/usr/ is in ruby-thread-order 1.1.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/thread_order/
/usr/lib/ruby/vendor_ruby/thread_order/version.rb
/usr/lib/ruby/vendor_ruby/thread_order/mutex.rb
/usr/lib/ruby/vendor_ruby/thread_order.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-thread-order/
/usr/share/doc/ruby-thread-order/Readme.md
/usr/share/doc/ruby-thread-order/copyright
/usr/share/doc/ruby-thread-order/changelog.Debian.gz
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/thread_order-1.1.0.gemspec