[ruby-core:119279] [Ruby master Bug#20723] `IO#close` is broken on Ruby 3.3+ when using the Fiber scheduler.

Issue #20723 has been updated by kjtsanaktsidis (KJ Tsanaktsidis).


Backport PR for 3.3 - https://github.com/ruby/ruby/pull/11664

No backport for 3.2 is required because this locking around close didn't exist there.

----------------------------------------
Bug #20723: `IO#close` is broken on Ruby 3.3+ when using the Fiber scheduler.
https://bugs.ruby-lang.org/issues/20723#change-109887

* Author: ioquatix (Samuel Williams)
* Status: Closed
* Assignee: kjtsanaktsidis (KJ Tsanaktsidis)
* Backport: 3.3: REQUIRED
----------------------------------------
The following program seems to work okay on Ruby 3.2 but hangs on Ruby 3.3:

```ruby
#!/usr/bin/env ruby

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'async'
end

require 'socket'

def close_while_reading(io)
  thread = Thread.new do
    Thread.current.report_on_exception = false
    io.wait_readable
  end
  
  # Wait until the thread is blocked on read:
  Thread.pass until thread.status == "sleep"
  
  Async do
    io.close
  end
  
  thread.join
end

begin
  client, server = Socket.pair(:UNIX, :STREAM)
  close_while_reading(client)
rescue => error
  $stderr.puts error.full_message
end
```



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