ウタダと申します。

Rubyにてログイン認証フォームを作成しております。

ＩＤとパスワードを入力してログインした際に、ＩＤとパスワードが
合っているか否かにかかわらず、「Errno::EIO (Input/output error):」の
エラーが出てしまいます。
Webrickサーバーを再起動すれば、一時的にはなおるのですが、またしばらくすると
上記エラーでログインできなくってしまいます。
Loginはhash_passwordを利用してMySQLに対して認証しています。
rbuy -v 
  ruby 1.8.5 (2006-08-25) [i686-linux]
mysql -V 
  mysql  Ver 14.12 Distrib 5.0.24a,

Logからいろいろい調べたのですが、それらしき情報が無く、質問させていただきました。

宜しくお願いします。

以下に詳細なエラーログを掲載します。
Processing LoginController#login (for 121.115.148.101 at 2006-11-12 13:16:47) [POST]
  Session ID: 32e694445fbcb80700da0af62fdd8d8f
  Parameters: {"user"=>{"name"=>"u", "password"=>"u"}, "action"=>"login", "controller"=>"login"
}

Errno::EIO (Input/output error):
    /app/models/user.rb:26:in `write'
    /app/models/user.rb:26:in `puts'
    /app/models/user.rb:26:in `login'
    /app/models/user.rb:36:in `try_to_login'
    /app/controllers/login_controller.rb:34:in `login'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `s
end'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `p
erform_action_without_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
 `perform_action_without_benchmark'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:6
9:in `perform_action_without_rescue'
    /usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:6
9:in `perform_action_without_rescue'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in `
perform_action'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `s
end'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `p
rocess_without_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
 `process_without_session_management_support'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_managemen
t.rb:117:in `process'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in `dispatch'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in `handle_dispatch
'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in `service'
    /usr/local/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    /usr/local/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    /usr/local/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    /usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start'
    /usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    /usr/local/lib/ruby/1.8/webrick/server.rb:95:in `start'
    /usr/local/lib/ruby/1.8/webrick/server.rb:92:in `each'
    /usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start'
    /usr/local/lib/ruby/1.8/webrick/server.rb:23:in `start'
    /usr/local/lib/ruby/1.8/webrick/server.rb:82:in `start'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in `dispatch'
    script/server:51
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