bugsnag

.ruby-version

jruby-1.7.18

bugsnag_threading_issue.gemspec

Gem::Specification.new do |spec|
  spec.name          = "bugsnag_threading_issue"
  spec.version       = '0.0.1'

  spec.files         = `git ls-files -z`.split("\x0")
  spec.require_paths = ["."]

  spec.add_dependency 'pry'
  spec.add_dependency 'rack', '~> 1.5.0'
  spec.add_dependency 'bugsnag', '2.8.1'
  spec.add_development_dependency "bundler", "~> 1.7"
end

bugsnag_threading_issue.rb

require 'bugsnag'
require 'bugsnag/rack'
require 'rack'

Bugsnag.configure do |c|
  c.project_root = File.expand_path('..', ENV['BUNDLE_GEMFILE'])
  c.logger = Logger.new('/dev/null')
end

module BugsnagThreadingIssue
  # jruby -G -S rackup
  class App
    def initialize
      @app = Rack::Builder.new do
        use Bugsnag::Rack

        map('/') do
          run ->(_) do
            count = Bugsnag.configuration.middleware.instance_variable_get(:@middlewares).count
            p "Bugsnag middlewares: #{count}"
            [200, {'Content-Type' => 'application/json' }, ["{\"middlewares\":#{count}}"]]
          end
        end
      end
    end

    def call(env)
      @app.call(env)
    end
  end

  # Command to reproduce: jruby -G -r"bugsnag_threading_issue" -e "BugsnagThreadingIssue::Core.reproduce"
  class Core
    def initialize
      1024.times.map do
        Thread.new do
          Bugsnag::Rack.new(->(_) { sleep 1; ['200', {}, ['']] }).call({})
        end
      end.map(&:value)
    end

    def self.reproduce
      loop { p new }
    end
  end
end

config.ru

require 'bugsnag_threading_issue'

run BugsnagThreadingIssue::App.new

Gemfile

source 'https://rubygems.org'

# Specify your gem's dependencies in bugsnag_threading_issue.gemspec
gemspec

Gemfile.lock

PATH
  remote: .
  specs:
    bugsnag_threading_issue (0.0.1)
      bugsnag (= 2.8.1)
      pry
      rack (~> 1.5.0)

GEM
  remote: https://rubygems.org/
  specs:
    bugsnag (2.8.1)
      multi_json (~> 1.0)
    coderay (1.1.0)
    ffi (1.9.8-java)
    method_source (0.8.2)
    multi_json (1.11.0)
    pry (0.10.1-java)
      coderay (~> 1.1.0)
      method_source (~> 0.8.1)
      slop (~> 3.4)
      spoon (~> 0.0)
    rack (1.5.2)
    slop (3.6.0)
    spoon (0.0.4)
      ffi

PLATFORMS
  java

DEPENDENCIES
  bugsnag_threading_issue!
  bundler (~> 1.7)