Issue #11567 has been updated by shyouhei (Shyouhei Urabe).

Status changed from Feedback to Closed

It seems fixed already.  Try a newer version.  Tell us if it still happens.

----------------------------------------
Bug #11567:  Segmentation fault CFUNC  :gets
https://bugs.ruby-lang.org/issues/11567#change-64311

* Author: dmitry_uk (D R)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
Running the below code under 2.2.3 results in a segmentation fault. Runs without issue on 2.1.6. Output attached as a text file.

```ruby
require 'open3'
require 'pp'

data_accessor = Mutex.new
results = {}
threads = []

200.times.each do |i|
  threads << Thread.new do
    Open3.popen3('ping localhost -c 2') do |_stdin, stdout, stderr, thread|
      
      { out: stdout, err: stderr }.each do |key, stream|
        t = "#{i}-" + key.to_s
        data_accessor.synchronize do
          results[t] = []
        end
        Thread.new do
          until (line = stream.gets).nil?
            data_accessor.synchronize do    
              results[t].push line
            end
          end
        end
      end

      thread.join
    end
  end
end

threads.each(&:join)

pp results
```

---Files--------------------------------
gets bug.txt (30.7 KB)


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