2.13.0 is causing app to crash repeatedly on Heroku with R10 and H10 errors

[monfresh]

Hi. I just upgraded a Rails app to puma 2.13.0, and after deployment, this happens:

2015-08-15 13:46:12.826 122 <190>1 2015-08-15T13:46:12.340214+00:00 app web.1 - - [3] * Preloading application
2015-08-15 13:46:14.735 131 <190>1 2015-08-15T13:46:14.353376+00:00 app web.1 - - [3] * Listening on tcp://0.0.0.0:9292
2015-08-15 13:46:14.811 134 <190>1 2015-08-15T13:46:14.409494+00:00 app web.1 - - [3] - Worker 0 (pid: 7) booted, phase: 0
2015-08-15 13:47:11.310 187 <45>1 2015-08-15T13:47:11.131628+00:00 heroku web.1 - - Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2015-08-15 13:47:11.386 125 <45>1 2015-08-15T13:47:11.131628+00:00 heroku web.1 - - Stopping process with SIGKILL
2015-08-15 13:47:13.195 130 <45>1 2015-08-15T13:47:13.098877+00:00 heroku api - - Deploy ec13484 by [REDACTED]
2015-08-15 13:47:13.262 129 <190>1 2015-08-15T13:47:13.168471+00:00 heroku slug-compiler - - Slug compilation started
2015-08-15 13:47:13.275 136 <45>1 2015-08-15T13:47:13.098877+00:00 heroku api - - Release v132 created by [REDACTED]
2015-08-15 13:47:13.337 130 <190>1 2015-08-15T13:47:13.168511+00:00 heroku slug-compiler - - Slug compilation finished
2015-08-15 13:47:13.445 134 <45>1 2015-08-15T13:47:12.140650+00:00 heroku web.1 - - State changed from starting to crashed
2015-08-15 13:47:13.878 305 <158>1 2015-08-15T13:47:13.594253+00:00 heroku router - - at=error code=H10 desc="App crashed" 

The app then keeps crashing over and over.

Reverting to 2.12.3 allowed the app to run normally again.

Here is my puma config:

workers Integer(ENV['WEB_CONCURRENCY'] || 2)
threads_count = Integer(ENV['MAX_THREADS'] || 5)
threads threads_count, threads_count

preload_app!

rackup DefaultRackup
port ENV['PORT'] || 3000
environment ENV['RACK_ENV'] || 'development'

[monfresh]

Thanks for the super quick fix! It works.