Execution expired with MONGREL. No problems with webrick

After my action has run for about 2 minutes i always get a timeout. It
doesn’t happen with WEBRICK. As far as i can see there is nothing wrong
with the code

"execution expired

RAILS_ROOT: config/…
Application Trace | Framework Trace | Full Trace

/opt/tools/lib/ruby/1.8/timeout.rb:54:in clone_attributes' /opt/tools/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:2068:ininject’
/opt/tools/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:2060:in
clone_attributes' /opt/tools/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1540:inattributes_before_type_cast’
/opt/tools/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1420:in
clone' lib/inorganic_parser.rb:153:inget_results’
lib/inorganic_parser.rb:143:in get_results' app/controllers/uploader_controller.rb:86:inparse_document’
app/controllers/uploader_controller.rb:16:in `save_file’
/opt/tools/bin/mongrel_rails:1"