Couldn't cleanly terminate all actors in 10 seconds w/ celluloid-io

[azin634]

Hello,

I've had a bot before but after updating the gem I've been seeing this error. I couldn't find any documentation/issue mentioning this. Any idea how to fix?

E, [2018-09-28T13:58:54.990388 #6215] ERROR -- : Couldn't cleanly terminate all actors in 10 seconds!
/home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep': No live threads left. Deadlock? (fatal)
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:77:in `block in receive'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:76:in `receive'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:50:in `wait'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid.rb:141:in `suspend'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:41:in `response'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:45:in `value'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/celluloid-0.17.3/lib/celluloid/proxy/sync.rb:22:in `method_missing'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/client.rb:51:in `start!'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:37:in `start!'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:29:in `block (2 levels) in run'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:69:in `handle_exceptions'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:27:in `block in run'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:26:in `loop'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:26:in `run'
	from /home/edwin/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/bot.rb:6:in `run'

[dblock]

Do you see this right away? It looks like something is blocking the execution and eventually it runs out of worker threads.

[danmilleruk]

Seeing this also on a first install using the examples in README.md.

Relevant gems & versions:

celluloid-essentials (0.20.5, 0.20.2)
celluloid-extras (0.20.5, 0.20.0)
celluloid-fsm (0.20.5, 0.20.0)
celluloid-io (0.17.3)
celluloid-pool (0.20.5, 0.20.0)
celluloid-supervision (0.20.6, 0.20.1)
slack-ruby-bot (0.11.1)```

[dblock]

This is just from running any sample? What's the easiest way to reproduce?

[danmilleruk]

Thanks for the quick response!

Yep, any sample. My steps are:
so running Ruby 2.5.0, 2.2.2 or 2.1.0 on OSX. Versions managed by RVM:

Added the following to a Gemfile:

source 'http://rubygems.org'

gem 'celluloid-io'
gem 'slack-ruby-bot'

bundle install output:

Fetching gem metadata from http://rubygems.org/..........
Fetching gem metadata from http://rubygems.org/.
Resolving dependencies...
Using concurrent-ruby 1.0.5
Using i18n 1.1.0
Using minitest 5.11.3
Using thread_safe 0.3.6
Using tzinfo 1.2.5
Using activesupport 5.2.1
Using bundler 1.16.5
Using hitimes 1.3.0
Using timers 4.1.2
Fetching celluloid-essentials 0.20.5
Installing celluloid-essentials 0.20.5
Fetching celluloid-extras 0.20.5
Installing celluloid-extras 0.20.5
Fetching celluloid-fsm 0.20.5
Installing celluloid-fsm 0.20.5
Fetching celluloid-pool 0.20.5
Installing celluloid-pool 0.20.5
Fetching celluloid-supervision 0.20.6
Installing celluloid-supervision 0.20.6
Fetching celluloid 0.17.3
Installing celluloid 0.17.3
Using nio4r 2.3.1
Fetching celluloid-io 0.17.3
Installing celluloid-io 0.17.3
Using multipart-post 2.0.0
Using faraday 0.15.3
Using faraday_middleware 0.12.2
Using gli 2.18.0
Using hashie 3.6.0
Using websocket-extensions 0.1.3
Using websocket-driver 0.7.0
Fetching slack-ruby-client 0.13.0
Installing slack-ruby-client 0.13.0
Fetching slack-ruby-bot 0.11.1
Installing slack-ruby-bot 0.11.1
Bundle complete! 2 Gemfile dependencies, 26 gems now installed.
Use bundle info [gemname] to see where a bundled gem is installed.

Added the following to test.rb:

require 'slack-ruby-bot'

class Bot < SlackRubyBot::Bot
  command 'ping' do |client, data, _match|
    client.say(text: 'pong', channel: data.channel)
  end
end

Bot.run

Executed via:

SLACK_API_TOKEN=redactedtoken bundle exec ruby pongbot.rb

Full stack trace:

I, [2018-09-29T16:42:02.590279 #51202]  INFO -- request: POST https://slack.com/api/rtm.start
D, [2018-09-29T16:42:02.590376 #51202] DEBUG -- request: Accept: "application/json; charset=utf-8"
User-Agent: "Slack Ruby Client/0.13.0"
Content-Type: "application/x-www-form-urlencoded"
I, [2018-09-29T16:42:02.892289 #51202]  INFO -- response: Status 200
D, [2018-09-29T16:42:02.892387 #51202] DEBUG -- response: content-type: "application/json; charset=utf-8"
content-length: "4941"
connection: "close"
date: "Sat, 29 Sep 2018 15:42:03 GMT"
server: "Apache"
x-accepted-oauth-scopes: "rtm:stream,client"
x-content-type-options: "nosniff"
x-slack-router: "p"
expires: "Mon, 26 Jul 1997 05:00:00 GMT"
cache-control: "private, no-cache, no-store, must-revalidate"
x-oauth-scopes: "identify,read,post,client,apps"
pragma: "no-cache"
x-xss-protection: "0"
x-slack-req-id: "<redacted>"
x-slack-exp: "1"
x-slack-backend: "h"
referrer-policy: "no-referrer"
strict-transport-security: "max-age=31536000; includeSubDomains; preload"
vary: "Accept-Encoding"
access-control-allow-origin: "*"
x-via: "haproxy-www-s85z"
x-cache: "Miss from cloudfront"
via: "1.1 adc13b6f5827d04caa2efba65479257c.cloudfront.net (CloudFront)"
x-amz-cf-id: "<redacted>"
E, [2018-09-29T16:42:13.036940 #51202] ERROR -- : Couldn't cleanly terminate all actors in 10 seconds!
Traceback (most recent call last):
  25: from pongbot.rb:9:in `<main>'
  24: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/bot.rb:6:in `run'
  23: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:26:in `run'
  22: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:26:in `loop'
  21: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:27:in `block in run'
  20: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:69:in `handle_exceptions'
  19: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:29:in `block (2 levels) in run'
  18: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:37:in `start!'
  17: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/client.rb:51:in `start!'
  16: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/proxy/sync.rb:22:in `method_missing'
  15: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:45:in `value'
  14: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:41:in `response'
  13: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid.rb:141:in `suspend'
  12: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:50:in `wait'
  11: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:76:in `receive'
  10: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   9: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   8: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   7: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:77:in `block in receive'
   6: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   5: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   4: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   3: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   2: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   1: from /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep': No live threads left. Deadlock? (fatal)
7 threads, 7 sleeps current:0x00007f8a9cf699f0 main thread:0x00007f8a9cc0b790
* #<Thread:0x00007f8a9d085d48 sleep_forever>
   rb_thread_t:0x00007f8a9cc0b790 native:0x000000010dd595c0 int:0
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:77:in `block in receive'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:76:in `receive'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:50:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid.rb:141:in `suspend'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:41:in `response'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:45:in `value'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/proxy/sync.rb:22:in `method_missing'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/client.rb:51:in `start!'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:37:in `start!'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:29:in `block (2 levels) in run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:69:in `handle_exceptions'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:27:in `block in run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:26:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/server.rb:26:in `run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-bot-0.11.1/lib/slack-ruby-bot/bot.rb:6:in `run'
   pongbot.rb:9:in `<main>'
* #<Celluloid::Thread:0x00007f8a9dbbd4e0@/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:47 sleep_forever>
   rb_thread_t:0x00007f8a9f8cbe50 native:0x0000700000ad0000 int:0
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:155:in `block in run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/group.rb:68:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:152:in `run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:131:in `block in start'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-essentials-0.20.5/lib/celluloid/internals/thread_handle.rb:14:in `block in initialize'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor/system.rb:78:in `block in get_thread'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:50:in `block in instantiate'
* #<Celluloid::Thread:0x00007f8a9dbb6028@/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:47 sleep_forever>
   rb_thread_t:0x00007f8a9f9854b0 native:0x0000700000bd3000 int:0
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:155:in `block in run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/group.rb:68:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:152:in `run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:131:in `block in start'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-essentials-0.20.5/lib/celluloid/internals/thread_handle.rb:14:in `block in initialize'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor/system.rb:78:in `block in get_thread'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:50:in `block in instantiate'
* #<Celluloid::Thread:0x00007f8a9dbadd88@/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:47 sleep_forever>
   rb_thread_t:0x00007f8a9ccc5100 native:0x0000700000cd6000 int:0
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:155:in `block in run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/group.rb:68:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:152:in `run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:131:in `block in start'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-essentials-0.20.5/lib/celluloid/internals/thread_handle.rb:14:in `block in initialize'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor/system.rb:78:in `block in get_thread'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:50:in `block in instantiate'
* #<Celluloid::Thread:0x00007f8a9db9ed60@/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:47 sleep_forever>
   rb_thread_t:0x00007f8a9f8cb590 native:0x0000700000dd9000 int:0
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:155:in `block in run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/group.rb:68:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:152:in `run'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:131:in `block in start'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-essentials-0.20.5/lib/celluloid/internals/thread_handle.rb:14:in `block in initialize'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor/system.rb:78:in `block in get_thread'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:50:in `block in instantiate'
* #<Celluloid::Thread:0x00007f8a9db8c890@/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/group/spawner.rb:47 sleep_forever>
   rb_thread_t:0x00007f8a9fb02310 native:0x0000700000edc000 int:0
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/socket.rb:46:in `join'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/socket.rb:46:in `start_sync'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/calls.rb:28:in `public_send'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/calls.rb:28:in `dispatch'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:16:in `dispatch'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/cell.rb:50:in `block in dispatch'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/cell.rb:76:in `block in task'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/actor.rb:339:in `block in task'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/task.rb:44:in `block in initialize'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/task/fibered.rb:14:in `block in create'
* #<Celluloid::Thread:0x00007f8a9db7ec90@/Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/concurrency/celluloid.rb:71 sleep_forever>
   rb_thread_t:0x00007f8a9cf699f0 native:0x0000700000fdf000 int:0
    depended by: tb_thread_id:0x00007f8a9fb02310
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `sleep'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:63:in `block in check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:58:in `check'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:77:in `block in receive'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:15:in `block in for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/timers-4.1.2/lib/timers/wait.rb:14:in `for'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/mailbox.rb:76:in `receive'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:50:in `wait'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid.rb:141:in `suspend'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:41:in `response'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/call/sync.rb:45:in `value'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/celluloid-0.17.3/lib/celluloid/proxy/sync.rb:22:in `method_missing'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/client.rb:82:in `run_loop'
   /Users/danmiller/.rvm/gems/ruby-2.5.0/gems/slack-ruby-client-0.13.0/lib/slack/real_time/concurrency/celluloid.rb:72:in `block in start_async'

[danmilleruk]

Also tested on a Centos 7 server with the same results, so it's not OSX specific.

[dblock]

I can reproduce.

This is specific to celluloid and is caused by the replacement of the Actor by a Thread in slack-ruby/slack-ruby-client#224. I am confused though to why this is happening, as the synchronous slack-ruby-client examples without the bot wrappers work fine.

That was done entirely to make specs happy, so I am going to try and undo this in slack-ruby/slack-ruby-client#228 and work around that problem.

[dblock]

Anyone care to try my branch?

gem 'slack-ruby-client', github: 'dblock/slack-ruby-client', branch: 'undo-224'

[danmilleruk]

Thanks @dblock, that looks to work perfectly now.

[dblock]

I released 0.13.2. I don't think we need to update the minimal version of slack-ruby-bot since it just affects celluloid. Everyone on this thread should bundle update slack-ruby-client.

[azin634]

Thank you both for the help! We updated to the latest and its working for us.