# Mongrel Error causing 500 redirects **URL:** \ **Category:** Rails\ **Created:** [January 12, 2007, 6:13pm UTC](https://www.ruby-forum.com/t/mongrel-error-causing-500-redirects/81750 "2007-01-12T18:13:54Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![cpjolicoeur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a183cd/32.png) [@cpjolicoeur](https://www.ruby-forum.com/u/cpjolicoeur)\ **Post date:** [January 12, 2007, 6:13pm UTC](https://www.ruby-forum.com/t/mongrel-error-causing-500-redirects/81750/1 "2007-01-12T18:13:54Z")
Just today I’ve started to get errors in my system that show up like this in my development.log file /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel\_rails:231b:211:in `run'`run’’.rb:117:in `process'sion_management_support' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel_rails:231b:211:in`run’`run''.rb:117:in`process’sion\_management\_support’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel\_rails:231b:211:in `run'`run’’.rb:117:in `process’sion\_management\_support’ I’m not sure what I could have changed that would cause these errors or if it was even something I did. When this error happens, my rails app issues the 500 Internal Server Error page and the whole session crashes. you need to close your browser and clear your cache before you can use my app again? Anyone seen anything like this or have any idea where to begin looking? ---
**Author:** ![cpjolicoeur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a183cd/32.png) [@cpjolicoeur](https://www.ruby-forum.com/u/cpjolicoeur)\ **Post date:** [January 12, 2007, 6:58pm UTC](https://www.ruby-forum.com/t/mongrel-error-causing-500-redirects/81750/2 "2007-01-12T18:58:28Z")
this is the full listing from the development.log file Jan 12 12:51:08 rpdev1 rails[17520]: marshal data too short /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/session/active\_record\_store.rb:82:in `load' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session/active_record_store.rb:82:in`unmarshal’ /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/session/active\_record\_store.rb:120:in `data' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session/active_record_store.rb:300:in`restore’ /usr/lib/ruby/1.8/cgi/session.rb:304:in `[]' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/cgi_process.rb:114:in`session’ /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/cgi\_process.rb:142:in `stale_session_check!' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/cgi_process.rb:108:in`session’ /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/base.rb:918:in `assign_shortcuts_without_flash' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/flash.rb:141:in`assign\_shortcuts’ /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/base.rb:402:in `process_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in`process\_without\_session\_management\_support’ /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/session\_management.rb:117:in `process' /usr/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in`dispatch’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/rails.rb:84:in `process' /usr/lib/ruby/1.8/sync.rb:229:in`synchronize’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/rails.rb:83:in `process' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:580:in`process\_client’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:579:in `each' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:579:in`process\_client’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:686:in `run' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:686:in`initialize’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:686:in `new' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:686:in`run’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:673:in `initialize' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:673:in`new’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:673:in `run' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/configurator.rb:267:in`run’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/configurator.rb:266:in `each' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/configurator.rb:266:in`run’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel\_rails:127:in `run' /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/command.rb:211:in`run’ /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel\_rails:231 /usr/bin/mongrel\_rails:18:in `load’ /usr/bin/mongrel\_rails:18 ---
**Author:** ![cpjolicoeur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a183cd/32.png) [@cpjolicoeur](https://www.ruby-forum.com/u/cpjolicoeur)\ **Post date:** [January 19, 2007, 4:30pm UTC](https://www.ruby-forum.com/t/mongrel-error-causing-500-redirects/81750/3 "2007-01-19T16:30:52Z")
That problem has nothing to do with mongrel. Its a problem with your session handling code. 95% of the time that people get the marshal data too short error it’s caused by storing too much data in the session. Or storing complete AR objects in the session. If you are storing full AR objects in the sessions then change your code to just store the id in the session and do a lookup on that id in a before filter. -Ezra On Jan 12, 2007, at 9:58 AM, Craig J. wrote: > /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/ > cgi\_process.rb:142:in > /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action\_controller/ > /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/rails.rb: > /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel.rb:579:in > `initialize’ > /usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/ > > – > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). > > > – Ezra Z. – Lead Rails Evangelist – removed\_email\_address@domain.invalid – Engine Y., Serious Rails Hosting – (866) 518-YARD (9273)