[ruby-core:61919] [ruby-trunk - Bug #9718] [Open] Segmentation fault is occurred on trunk and 2.1

Issue #9718 has been reported by Kenta Murata.

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Bug #9718: Segmentation fault is occurred on trunk and 2.1
https://bugs.ruby-lang.org/issues/9718

* Author: Kenta Murata
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: current: 2.2.0
* ruby -v: ruby 2.1.2p80 (2014-03-01 revision 45231) [x86_64-darwin13.0]
* Backport: 2.0.0: UNKNOWN, 2.1: REQUIRED
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The following code occurs segmentation fault on trunk and 2.1.

```ruby
require 'thread'

queue = Queue.new

thread = Thread.start do
  loop do
    queue.pop.call
  end
end

loop do
  queue << -> do
    p Time.now
    sleep 1
  end
end
```



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