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I use BrB to share a datasource for various worker processes in Ruby 1.9 that I fork with Process#fork : Thread.abort_on_exception = true fork do puts "Initializing data source process... (PID: #{Process.pid})" data = DataSource.new(files) BrB::Service.start_service(:object => data, :verbose => false, :host => host, :port => port) EM.reactor_thread.join end The workers are forked as follows: 8.times do |t| fork do data = BrB::Tunnel.create(nil, "brb://#{host}:#{port}", :verbose => false) puts "Launching #{threads_num} worker threads... (PID: #{Process.pid})" threads = [] threads_num.times { |i| threads &lt;&lt; Thread.new { while true begin worker = Worker.new(data, config) rescue OutOfTargetsError break rescue Exception => e puts "An unexpected exception was caught: #{e.class} => #{e}" sleep 5 end end } } threads.each { |t| t.join } data.stop_service EM.stop end end This works pretty much perfectly, but after around 10 minutes of running I get the following error: bootstrap.rb:47:in `join': deadlock detected (fatal) from bootstrap.rb:47:in `block in <main>' from bootstrap.rb:39:in `fork' from bootstrap.rb:39:in `<main>'</pre> This error doesn't tell me much about where the deadlock is actually happening, it only points me to the join on the EventMachine thread. How do I trace back at which point the program locks up?

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