Spring 4.2.0 crashing when running rake

[fschwahn]

This happened to me when running rails db:migrate.

I have never seen this before, and I have been using spring daily for years. Maybe it is connected to the changes in 4.2.0 (namely #708).

I'm running spring server as a separate process, so I have logs / stacktrace to share:

15:50:59 spring.1 | [2024-04-26 15:50:59 +0200] [4120] [server] accepted client
15:50:59 spring.1 | [2024-04-26 15:50:59 +0200] [4120] [server] running command rake
15:50:59 spring.1 | [2024-04-26 15:50:59 +0200] [4120] [server] shutting down
15:50:59 spring.1 | [2024-04-26 15:50:59 +0200] [4120] [application_manager:development] stopping
15:50:59 spring.1 | [2024-04-26 15:50:59 +0200] [4120] [application_manager:test] stopping
15:50:59 spring.1 | [2024-04-26 15:50:59 +0200] [12426] [application:development] forced exit
15:50:59 spring.1 | /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/application_manager.rb:63:in `send_io': Invalid argument - sendmsg(2) (Errno::EINVAL)
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/application_manager.rb:63:in `block in run'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/application_manager.rb:44:in `block in with_child'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/application_manager.rb:22:in `synchronize'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/application_manager.rb:41:in `with_child'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/application_manager.rb:62:in `run'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/server.rb:70:in `serve'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/server.rb:51:in `block in start_server'
15:50:59 spring.1 | 	from <internal:kernel>:187:in `loop'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/server.rb:51:in `start_server'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/server.rb:45:in `boot'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/server.rb:14:in `boot'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/client/server.rb:10:in `call'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/client/command.rb:7:in `call'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/client.rb:30:in `run'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/bin/spring:49:in `<top (required)>'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/binstub.rb:5:in `load'
15:50:59 spring.1 | 	from /Users/fabian/.rbenv/versions/3.3.1/lib/ruby/gems/3.3.0/gems/spring-4.2.0/lib/spring/binstub.rb:5:in `<top (required)>'
15:50:59 spring.1 | 	from <internal:/Users/fabian/.rbenv/versions/3.3.1/lib/ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:136:in `require'
15:50:59 spring.1 | 	from <internal:/Users/fabian/.rbenv/versions/3.3.1/lib/ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:136:in `require'
15:50:59 spring.1 | 	from bin/spring:12:in `block in <main>'
15:50:59 spring.1 | 	from <internal:kernel>:90:in `tap'
15:50:59 spring.1 | 	from bin/spring:9:in `<main>'

[fmichaut-diff]

Also running into this issue on MacOS.

This happens to me when the spring server is running, but a change gets detected by the watchers (eg: changing a config/ file).

The next client to connect to the server will trigger that error, killing the server process and any live pre-existing client and will make the new client hang indefinitely on preload_status = application.gets.

This is very frustrating when working on a git project, cause every change of branch is likely to trigger a watcher, which breaks the spring server and kills any open session (eg: a rails console being used, open a new terminal to run a rails db:migrate, rails g migration, or even another rails c will kill the running console, and the new process will hang indefinitely and won't even respond to CTRL-C)

I've been running into that issue for months now, it would be great if it could get fixed.

Relates to #396, #663, looks like this issue is very resilient

[prognostikos]

@fschwahn @fmichaut-diff I have a fix/workaround for this in #727

You could try it out to see if it fixes your issue, I have done so by using bundle open and applied the patch in the pr, as spring doesn't support being run as gem "spring", git: "..."

Would love to hear if it works with your version of rails, ruby, os, etc.

[prognostikos]

Or as noted in CONTRIBUTING.md you can use rake install to test the change.

[fschwahn]

I was able to reproduce reliably using your steps, and after applying your patch it no longer happens. I will now run this patch locally.

[prognostikos]

I was able to reproduce reliably using your steps, and after applying your patch it no longer happens. I will now run this patch locally.

Thanks @fschwahn. If you have a moment to list the versions of your OS, ruby and rails that would be helpful. I'm interested to know if the fix works for more than just for my versions.

[fschwahn]

OS: macOS 14.6.1
Ruby: 3.3.5
Rails: 7.1.3.4

[fmichaut-diff]

I have been testing since yesterday, and things are looking good so far ! Thanks

OS: MacOS 14.6.1
Ruby: 3.3.0
Rails: 7.2.1

[chaadow]

@fschwahn @fmichaut-diff I have a fix/workaround for this in #727

You could try it out to see if it fixes your issue, I have done so by using bundle open and applied the patch in the pr, as spring doesn't support being run as gem "spring", git: "..."

Would love to hear if it works with your version of rails, ruby, os, etc.

I actually managed to make spring work with gem 'spring', github: '...'. I also stumbled onto this in the README, but told myself that this piece of information might be obsolete and was written probably in the 2013/2014 era.

so here is how my bin/spring file look like in my rails project

#!/usr/bin/env ruby

# This file loads Spring without loading other gems in the Gemfile in order to be fast.
# It gets overwritten when you run the `spring binstub` command.

if !defined?(Spring) && [nil, '', "development", "test"].include?(ENV["RAILS_ENV"])
  require "bundler/setup"
  require "spring/binstub"
end

this simply makes it work. the reason it does not work with git is because of these lines

  Bundler.locked_gems.specs.find { |spec| spec.name == "spring" }&.tap do |spring|
    Gem.use_paths Gem.dir, Bundler.bundle_path.to_s, *Gem.path

but when I realized i don't need them to make spring work, I simply removed them.

(screen of my diff )

Hopefully this can help people use forked versions of spring in their projects. I just merged 3 of the PRs you guys did in my own fork, and it works flawlessly. and it's ready for ruby 3.4.0 release 👌🏼