From: "luke-gru (Luke Gruber) via ruby-core" <ruby-core@...>
Date: 2023-01-31T22:26:45+00:00
Subject: [ruby-core:112155] [Ruby master Bug#19395] Process forking within non-main Ractor creates child stuck in busy loop

Issue #19395 has been reported by luke-gru (Luke Gruber).

----------------------------------------
Bug #19395: Process forking within non-main Ractor creates child stuck in busy loop
https://bugs.ruby-lang.org/issues/19395

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
```ruby
def test_fork_in_ractor
  r2 = Ractor.new do
    pid = fork do
      exit Ractor.count
    end
    pid
  end
  pid = r2.take
  puts "Process #{Process.pid} waiting for #{pid}"
  _pid, status = Process.waitpid2(pid) # stuck forever
  if status.exitstatus != 1
    raise "status is #{status.exitstatus}"
  end
end
test_fork_in_ractor()
 ```

$ top # shows CPU usage is high for child process



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