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Bug #10620

closed

#define_singleton_method keeps object from being garbage collected

Added by sean@duke.edu (Sean Dilda) over 9 years ago. Updated about 9 years ago.

Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
2.1.5
[ruby-core:66959]

Description

After using #define_singleton_method on an object, the object is never garbage collected

Sample code:
#!/usr/bin/env ruby

obj = Object.new
obj_id = obj.object_id
obj = nil

GC.start
GC.start
GC.start
GC.start
begin
ObjectSpace._id2ref obj_id
puts "GC failed, object still exists"
rescue RangeError
puts "GC worked"
end

obj = Object.new
obj.define_singleton_method(:f) { "F" }
obj_id = obj.object_id
obj = nil

GC.start
GC.start
GC.start
GC.start
begin
ObjectSpace._id2ref obj_id
puts "GC failed, object still exists"
rescue RangeError
puts "GC worked"
end

This outputted:
GC worked
GC failed, object still exists

The object without the singleton method was cleaned up properly, the object with defined_singleton_method used never got cleaned up.

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