backtrace:

mongo-1.10.1/lib/mongo/connection/pool_manager.rb:150→ synchronize
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:150→ pools
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:263→ connected?
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:233→ refresh
mongo-1.10.1/lib/mongo/cursor.rb:550→ rescue in block in send_initial_query
mongo-1.10.1/lib/mongo/cursor.rb:561→ block in send_initial_query
mongo-1.10.1/lib/mongo/functional/logging.rb:55→ block in instrument
mongo-1.10.1/lib/mongo/functional/logging.rb:20→ instrument
mongo-1.10.1/lib/mongo/functional/logging.rb:54→ instrument
mongo-1.10.1/lib/mongo/cursor.rb:539→ send_initial_query
mongo-1.10.1/lib/mongo/cursor.rb:524→ refresh
mongo-1.10.1/lib/mongo/cursor.rb:136→ next
mongo-1.10.1/lib/mongo/db.rb:556→ command
mongo-1.10.1/lib/mongo/connection/node.rb:110→ block (2 levels) in set_config
/home/apps/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/timeout.rb:66→ timeout
mongo-1.10.1/lib/mongo/connection/node.rb:109→ block in set_config
mongo-1.10.1/lib/mongo/connection/node.rb:102→ synchronize
mongo-1.10.1/lib/mongo/connection/node.rb:102→ set_config
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:218→ block in connect_to_members
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:214→ each
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:214→ connect_to_members
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:65→ block in connect
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:60→ synchronize
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:60→ connect
mongo-1.10.1/lib/mongo/connection/pool_manager.rb:77→ refresh!
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:205→ block in connect
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:198→ synchronize
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:198→ connect
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:258→ hard_refresh!
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:244→ refresh
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:520→ sync_refresh
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:340→ checkout
mongo-1.10.1/lib/mongo/mongo_replica_set_client.rb:358→ checkout_reader
mongo-1.10.1/lib/mongo/cursor.rb:613→ checkout_socket_from_connection
mongo-1.10.1/lib/mongo/cursor.rb:542→ block in send_initial_query
mongo-1.10.1/lib/mongo/functional/logging.rb:55→ block in instrument
mongo-1.10.1/lib/mongo/functional/logging.rb:20→ instrument
mongo-1.10.1/lib/mongo/functional/logging.rb:54→ instrument
mongo-1.10.1/lib/mongo/cursor.rb:539→ send_initial_query
mongo-1.10.1/lib/mongo/cursor.rb:524→ refresh
mongo-1.10.1/lib/mongo/cursor.rb:136→ next
mongo-1.10.1/lib/mongo/db.rb:556→ command
mongo-1.10.1/lib/mongo/collection.rb:1131→ generate_indexes
mongo-1.10.1/lib/mongo/collection.rb:585→ ensure_index
mongo-1.10.1/lib/mongo/gridfs/grid_file_system.rb:40→ initialize