From: Farruco Sanjurjo <madtrick@...>
Date: 2011-07-22T21:24:21+09:00
Subject: [ruby-core:38394] [Ruby 1.9 - Bug #5077][Open] method_missing throws NoMemoryError after inheriting from BasicObject


Issue #5077 has been reported by Farruco Sanjurjo.

----------------------------------------
Bug #5077: method_missing throws NoMemoryError after inheriting from BasicObject
http://redmine.ruby-lang.org/issues/5077

Author: Farruco Sanjurjo
Status: Open
Priority: High
Assignee: 
Category: 
Target version: 1.9.2
ruby -v: ruby 1.9.2p290 (2011-07-09 revision 32478) [x86_64-linux]


If a class inherits from BasicObject and then overwrites method_missing like this:

class A < BasicObject
  def method_missing(*a)
     puts "#{a}"
  end
end

And we try it:

A.new.fooooo


The interpreter enters what looks like a loop and then crashes with this trace (in irb):

NoMemoryError: failed to allocate memory
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'
	from (irb):3:in `method_missing'

If we create the same class with the same method_missing but without inheriting from BasicObject it works right.


-- 
http://redmine.ruby-lang.org