Some certain application fails to reload

[tycooon]

So i have 2 apps, one of them restarts just fine:

$ spring status
Spring is running:

74825 spring server | app1 | started 4 mins ago
75216 spring app    | app1 | started 3 mins ago | development mode

$ touch Gemfile.lock

# Run rails c in other tab – it works just fine but takes some time because app is reloaded.

$ spring status
Spring is running:

74825 spring server | app1 | started 5 mins ago
75498 spring app    | app1 | started 14 secs ago | development mode

But the other one just hangs when i touch the gemfile:

bash-3.2$ spring status
Spring is running:

75643 spring server | app2 | started 14 secs ago
75664 spring app    | app2 | started 14 secs ago | development mode

$ touch Gemfile.lock

# Try to run rails c in other tab – it hangs forever

$ spring status
Spring is running:

75643 spring server | app2 | started 1 min ago
75696 (ruby) # this process is dead

Both applications use spring 1.6.0 and ruby 2.3.0. Is there a way for me to debug why does the second application hang? It seems to me that the problem is somewhere in the app code, but I have no idea how to debug this.

[tycooon]

P.S. All I get in spring log after touching gemfile is this:

[2016-01-13 18:39:19 +0300] [76550] [application:development] preloading app
[2016-01-13 18:39:27 +0300] [76550] [application:development] initialized -> running
/Users/tycooon/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/spring-1.6.0/lib/spring/application.rb:286:in `read': stream closed (IOError)
    from /Users/tycooon/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/spring-1.6.0/lib/spring/application.rb:286:in `block (2 levels) in with_pty'`

76550 is the actual process that hangs.

[ayufan]

Check this out: #484

[tycooon]

It turns out the problem was in this initializer in my app:

unless Rails.env.production?
  Thread.abort_on_exception = true
end

I just removed it and reloading works fine.

[ayufan]

Yes, it's. My MR tries to fix that problem.