bind: name or service not known when trying to resolve DNS names

[perlun]

Environment

• JRuby 1.7.25
• Java version:
  • java version "1.8.0_05"
  • Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
    ** Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)
• OS X:
  • Darwin ecvaawjback.local 15.4.0 Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64 x86_64

Expected behavior

Being able to use resolver.getaddresses without exceptions.

Actual Behavior

An exception like below:

ERROR [2016-05-18 09:05:48.004] ConsoleLogger: Error message: bind: name or service not known
ERROR [2016-05-18 09:05:48.004] ConsoleLogger: Stack trace:
ERROR [2016-05-18 09:05:48.004] ConsoleLogger:         org/jruby/ext/socket/RubyUDPSocket.java:160:in `bind'
ERROR [2016-05-18 09:05:48.004] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:638:in `bind_random_port'
ERROR [2016-05-18 09:05:48.004] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:723:in `initialize'
ERROR [2016-05-18 09:05:48.004] ConsoleLogger:         org/jruby/RubyArray.java:1613:in `each'
ERROR [2016-05-18 09:05:48.004] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:707:in `initialize'
ERROR [2016-05-18 09:05:48.004] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:545:in `make_udp_requester'
ERROR [2016-05-18 09:05:48.005] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:500:in `each_resource'
ERROR [2016-05-18 09:05:48.005] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:396:in `each_address'
ERROR [2016-05-18 09:05:48.005] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/jruby/jruby-complete-1.7.25.jar!/META-INF/jruby.home/lib/ruby/1.9/resolv.rb:384:in `getaddresses'
ERROR [2016-05-18 09:05:48.005] ConsoleLogger:         /Users/jakobbacklund/git/eCraft.uxFactory.Server/src/server/core/lib/extensions/mongo/uri_parser.rb:81:in `resolve_dns_aliases'

I've looked in the JRuby source code for the failing method (bind_random_port) and it looks like this:

    def self.bind_random_port(udpsock, bind_host="0.0.0.0") # :nodoc:
      begin
        port = rangerand(1024..65535)
        udpsock.bind(bind_host, port)
      rescue Errno::EADDRINUSE
        retry
      end
    end

Note: works for some people but fails for others. Tried rebooting machine with no success.

We tried making a repro case but it unfortunately works even on the machines where the full integrated test fails...

require 'resolv'
resolver = Resolv::DNS.new
puts resolver.getaddresses('localhost').inspect

Any suggestions for how we can debug this more?

[headius]

I believe I fixed this on master, so it may be possible to backport for 1.7.26.

[headius]

Duplicate of #3659.

[headius]

@perlun If you get a chance you might try a 1.7.26 snapshot from http://ci.jruby.org. Let us know right away if it doesn't Resolv your issues 😄