From: alex@...
Date: 2014-11-24T21:04:28+00:00
Subject: [ruby-core:66440] [ruby-trunk - Bug #10537] Repeated creation and garbage collection of WeakRef instances against a single object leaks memory

Issue #10537 has been updated by Alex Boyd.


Getting this:

~~~
irb(main):008:0> a = Object.new
=> #<Object:0x007fe1b983a278>
irb(main):009:0> WeakRef.new a
=> #<Object:0x007fe1b983a278>
irb(main):010:0> WeakRef.new a
NotImplementedError: method `==' called on broken T_???(0x10) object (0x007fe1b9842258 flags=0x7fe1b9842270)
	from /Users/aboyd/projects/ruby-trunk-install/lib/ruby/2.2.0/weakref.rb:87:in `[]='
	from /Users/aboyd/projects/ruby-trunk-install/lib/ruby/2.2.0/weakref.rb:87:in `initialize'
	from (irb):10:in `new'
	from (irb):10
	from bin/irb:11:in `<main>'
~~~

No time to dig in further right now, but I'll update when I do.

----------------------------------------
Bug #10537: Repeated creation and garbage collection of WeakRef instances against a single object leaks memory
https://bugs.ruby-lang.org/issues/10537#change-50068

* Author: Alex Boyd
* Status: Open
* Priority: Normal
* Assignee: 
* Category: lib
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-11-24 trunk 48552) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
~~~
require 'weakref'
a = Object.new
1_000_000.times do
  WeakRef.new a
end
GC.start
~~~

The above results in Ruby consuming ~150 MB of RAM, all of which can only be freed by dropping `a`. This should not be the case - an object being weakly referenced should not itself hold a reference to the WeakRef (or any associated data) pointing at it.



-- 
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