Rails's mysql connection pool running dry because Thread#wait return value changed in ruby 1.9

gistfile1.txt

## Rails's mysql connection pool running dry because Thread#wait return value changed
## in ruby 1.9. This, by the way, is with Rails 2.3.14 so it's not just a 3.x thing
## https://rails.lighthouseapp.com/projects/8994/tickets/5736-connections-not-released-in-rails-3 edit


Processing WebpagesController#update (for 63.224.186.69 at 2011-10-02 15:16:48) [PUT]
[...parameters...]
Redirected to http://[redacted]/siteman/webpages/1/subpages
Completed in 26ms (DB: 19) | 302 Found [http://[redacted]/siteman/webpages/2]
/!\ FAILSAFE /!\  2011-10-02 15:16:48 -0500
  Status: 500 Internal Server Error
  deadlock detected
    /usr/local/lib/ruby/1.9.1/thread.rb:71:in `sleep'
    /usr/local/lib/ruby/1.9.1/thread.rb:71:in `wait'
    /usr/local/lib/ruby/1.9.1/monitor.rb:100:in `wait'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:192:in `block (2 levels) in checkout'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:184:in `loop'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:184:in `block in checkout'
    /usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:183:in `checkout'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:98:in `connection'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:326:in `retrieve_connection'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in `retrieve_connection'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_specification.rb:115:in `connection'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/query_cache.rb:9:in `cache'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/query_cache.rb:28:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.14/lib/action_controller/string_coercion.rb:25:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.2/lib/rack/head.rb:9:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.2/lib/rack/methodoverride.rb:24:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.14/lib/action_controller/params_parser.rb:15:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/rack/metal.rb:47:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.14/lib/action_controller/session/cookie_store.rb:99:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.14/lib/action_controller/failsafe.rb:26:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.2/lib/rack/lock.rb:11:in `block in call'
    <internal:prelude>:10:in `synchronize'
    /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.2/lib/rack/lock.rb:11:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.14/lib/action_controller/dispatcher.rb:106:in `call'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `block in handle_spawn_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/utils.rb:479:in `safe_fork'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:180:in `start'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:219:in `block (2 levels) in spawn_rails_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:214:in `block in spawn_rails_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
    <internal:prelude>:10:in `synchronize'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
    /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.9/helper-scripts/passenger-spawn-server:99:in `<main>'