error.log

[ pid=6271 thr=70080591090100 file=utils.rb:176 time=2011-10-04 04:32:38.589 ]: *** Exception ThreadError in application (thread 0x7f79d179a368 tried to join itself) (process 6271, thread #<Thread:0x7f79d179a368>):
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-1.3.3/lib/rack/lock.rb:14:in `lock'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-1.3.3/lib/rack/lock.rb:14:in `call'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-cache-1.0.3/lib/rack/cache/context.rb:132:in `forward'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-cache-1.0.3/lib/rack/cache/context.rb:243:in `fetch'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-cache-1.0.3/lib/rack/cache/context.rb:181:in `lookup'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-cache-1.0.3/lib/rack/cache/context.rb:65:in `call!'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/rack-cache-1.0.3/lib/rack/cache/context.rb:50:in `call'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/hoptoad_notifier-2.4.11/lib/hoptoad_notifier/user_informer.rb:12:in `call'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/railties-3.1.0/lib/rails/engine.rb:455:in `call'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/railties-3.1.0/lib/rails/railtie/configurable.rb:30:in `send'
        from /u/apps/vlphp/shared/ruby/bundle/ruby/1.8/gems/railties-3.1.0/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/utils.rb:479:in `safe_fork'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:180:in `start'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
        from /var/lib/gems/1.8/gems/passenger-3.0.2/helper-scripts/passenger-spawn-server:99
[Tue Oct 04 04:32:40 2011] [info] [client 112.95.143.22] Request header read timeout

Yes it was a bug in the airbrake/hoptoad library.

They merged my patch in airbrake/airbrake#21

Thanks very much!