From: tom@...
Date: 2016-05-27T18:58:54+00:00
Subject: [ruby-core:75744] [Ruby trunk Bug#11953] ThreadError in 2.3 on code	that works on 2.2.4

Issue #11953 has been updated by Tom Mornini.


Tom Mornini wrote:

> We'll try it under 2.2.4 and report back.

We actually tested against 2.2.5, and we're seeing identical behavior to 2.3.1.

I'm going to file an issue against Celluloid on Github and reference this ticket.


----------------------------------------
Bug #11953: ThreadError in 2.3 on code that works on 2.2.4
https://bugs.ruby-lang.org/issues/11953#change-58869

* Author: Clayton Flesher
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.3.0
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
This is my first bug reporting, so I'm sorry if this isn't exactly correct format. I'll update my report accordingly if pointed in the right direction.

I ran into what appears to be a bug while doing a quiz.

I've included the breaking code, the test suite and the description of the quiz as attachments to this bug report.

The following code works fine on Ruby 2.2.4.

```ruby
class Prime
  def self.nth(num)
    error(num)
    primes = build_primes(num)
    primes.last
  end

  private

  def build_primes(num)
    primes = [2]
    index  = 3 
    until primes.size == num
      if example?(index, primes)
        primes << index
      end
      index += 1
    end
    primes
  end

  def error(num)
    unless num > 0
      raise ArgumentError
    end
  end

  def example?(index, primes)
    primes.each do |prime|
      if index % prime == 0
        return false
      end
    end
    true
  end
end
```

It raises this error in Ruby 2.3.0

```
ThreadError: deadlock; recursive locking
    /home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `synchronize'
    /home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `instance'
    /home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:142:in `block in instance'
    /home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `synchronize'
    /home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `instance'
    /home/clayton/exercism/ruby/nth-prime/nth_prime.rb:3:in `nth'
    nth_prime_test.rb:28:in `test_first'
```

If this is expected behavior, I'm sorry in advance for wasting your time.

---Files--------------------------------
nth_prime.rb (528 Bytes)
nth_prime_test.rb (973 Bytes)
README.md (1.27 KB)


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