Issue #3191 has been updated by Karl Baum. I was able to trap this exception before the shutdown: y06-s00055.14884 #<SystemExit: #<SystemExit:0x10aa6120>> y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/1.8/net/imap.rb:934:in `initialize' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/connection.rb:417:in `new' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/connection.rb:417:in `connect_to_master' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/connection.rb:414:in `each' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/connection.rb:414:in `connect_to_master' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/connection.rb:580:in `checkout' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/connection.rb:341:in `send_message' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/collection.rb:312:in `update' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-0.19.1/lib/../lib/mongo/collection.rb:208:in `save' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:38:in `send' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:38 y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:22:in `call' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:22:in `attempt' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:39:in `save' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:38:in `send' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:38 y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:22:in `call' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:22:in `attempt' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/collections/mimic.rb:39:in `save' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/commands/save.rb:17:in `execute' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/commands/create.rb:15:in `execute' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongoid-1.2.14/lib/mongoid/commands.rb:138:in `create!' y06-s00055.14884 /data/weshop/releases/20100430210714/app/models/email/mongo_message.rb:62:in `create_from_message!' y06-s00055.14884 /data/weshop/releases/20100430210714/app/models/email/message.rb:405:in `create_mongo_message!' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:178:in `send' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:178:in `evaluate_method' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:166:in `call' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:93:in `run' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:92:in `each' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:92:in `send' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:92:in `run' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/callbacks.rb:276:in `run_callbacks' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:344:in `callback' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:267:in `create' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2874:in `create_or_update_without_callbacks' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:250:in `create_or_update' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2555:in `save_without_validation!' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/validations.rb:1088:in `save_without_dirty!' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/dirty.rb:87:in `save_without_transactions!' y06-s00055.14884 /opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:200:in `save!' ---------------------------------------- http://redmine.ruby-lang.org/issues/show/3191 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