hang.rb

# Reliably hangs JRuby-9.0.0.0
# jruby 9.0.0.0 (2.2.2) 2015-07-21 e10ec96 OpenJDK 64-Bit Server VM 25.51-b03 on 1.8.0_51-b16 +jit [FreeBSD-amd64]

require 'securerandom'

Array.new(4).map do
	Thread.new do
		100_000.times do |i|
			print "#{Thread.current.inspect}: #{i}\n" if i % 1000 == 0
			key = SecureRandom.random_bytes(4)
			hash = {}
			hash[key] = true
		end
	end
end.map(&:join)