From: micha.specht@...
Date: 2017-02-17T11:00:36+00:00
Subject: [ruby-core:79573] [Ruby trunk Bug#11567] Segmentation fault CFUNC	:gets

Issue #11567 has been updated by Michael Specht.


I'm having the same problem. Running the code as it is, I get crashes with both Ruby 2.3.1 and 2.4.0:

~~~
test.rb:18: [BUG] Segmentation fault at 0x00000000000000
ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0003 p:---- s:0011 e:000010 CFUNC  :gets
c:0002 p:0027 s:0007 e:000006 BLOCK  test.rb:18 [FINISH]
c:0001 p:---- s:0003 e:000002 (none) [FINISH]

~~~

~~~
test.rb:18: [BUG] Segmentation fault at 0x00000000000000
ruby 2.3.1p112 (2016-04-26) [x86_64-linux-gnu]

-- Control frame information -----------------------------------------------
c:0003 p:---- s:0008 e:000007 CFUNC  :gets
c:0002 p:0027 s:0005 e:000004 BLOCK  test.rb:18 [FINISH]
c:0001 p:---- s:0002 e:000001 (none) [FINISH]

~~~
I can't even get the complete output or Ctrl+C out of it, because my shell hangs after that (two different systems).

----------------------------------------
Bug #11567:  Segmentation fault CFUNC  :gets
https://bugs.ruby-lang.org/issues/11567#change-63005

* Author: D R
* Status: Feedback
* 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.

```rb
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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