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毎回でなく、たまに異常終了します。

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Processing WelcomeController#index (for xxx.xxx.xxx.xxx at 2009-xx-xx xx:xx:xx) [GET]
Session ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Parameters: {"action"=>"index", "controller"=>"welcome"}

IOError (closed stream):
/usr/lib/ruby/1.8/mysql.rb:1032:in `sync='
/usr/lib/ruby/1.8/mysql.rb:1032:in `write'
/usr/lib/ruby/1.8/mysql.rb:1092:in `finalizer'
/usr/lib/ruby/1.8/yaml.rb:133:in `call'
/usr/lib/ruby/1.8/yaml.rb:133:in `load'
/usr/lib/ruby/1.8/yaml.rb:133:in `load'
/app/models/setting.rb:38
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:496:in `require'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:496:in `require'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:104:in `require_or_load'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:248:in `load_missing_constant'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:453:in `const_missing'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:465:in `const_missing'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:260:in `load_missing_constant'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:469:in `const_missing'
/app/controllers/application.rb:35:in `user_setup'
/vendor/rails/actionpack/lib/action_controller/filters.rb:469:in `send!'
/vendor/rails/actionpack/lib/action_controller/filters.rb:469:in `call'
/vendor/rails/actionpack/lib/action_controller/filters.rb:441:in `run'
/vendor/rails/actionpack/lib/action_controller/filters.rb:716:in `run_before_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:695:in `call_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:689:in `perform_action_without_benchmark'
/vendor/rails/actionpack/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/vendor/rails/actionpack/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/vendor/rails/actionpack/lib/action_controller/rescue.rb:199:in `perform_action_without_caching'
/vendor/rails/actionpack/lib/action_controller/caching.rb:678:in `passenger_orig_perform_action'
/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache'
/vendor/rails/activerecord/lib/active_record/query_cache.rb:8:in `cache'
/vendor/rails/actionpack/lib/action_controller/caching.rb:677:in `passenger_orig_perform_action'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/request_handler.rb:53:in `perform_action'
/vendor/rails/actionpack/lib/action_controller/base.rb:524:in `send'
/vendor/rails/actionpack/lib/action_controller/base.rb:524:in `process_without_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:685:in `process_without_session_management_support'
/vendor/rails/actionpack/lib/action_controller/session_management.rb:123:in `process'
/vendor/rails/actionpack/lib/action_controller/base.rb:388:in `process'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:171:in `handle_request'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:115:in `dispatch'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:126:in `dispatch_cgi'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:9:in `dispatch'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/request_handler.rb:38:in `process_request'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_request_handler.rb:165:in `main_loop'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/application_spawner.rb:321:in `start_request_handler'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/application_spawner.rb:282:in `handle_spawn_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/utils.rb:163:in `safe_fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/utils.rb:161:in `fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/utils.rb:161:in `safe_fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/application_spawner.rb:280:in `handle_spawn_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/utils.rb:163:in `safe_fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/utils.rb:161:in `fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/utils.rb:161:in `safe_fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/application_spawner.rb:279:in `handle_spawn_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:317:in `__send__'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:317:in `main_loop'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:168:in `start_synchronously'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:135:in `start'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:112:in `fork'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:112:in `start'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/railz/application_spawner.rb:179:in `start'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/spawn_manager.rb:222:in `spawn_rails_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/spawn_manager.rb:217:in `synchronize'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/spawn_manager.rb:217:in `spawn_rails_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/spawn_manager.rb:126:in `spawn_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/spawn_manager.rb:251:in `handle_spawn_application'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:317:in `__send__'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:317:in `main_loop'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/lib/passenger/abstract_server.rb:168:in `start_synchronously'
/usr/lib64/ruby/gems/1.8/gems/passenger-2.0.6/bin/passenger-spawn-server:46

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