From: "usa (Usaku NAKAMURA)" <usa@...>
Date: 2012-11-13T22:20:46+09:00
Subject: [ruby-core:49303] [Backport93 - Backport #7123] Segmentation fault in ruby 1.9.3-p194


Issue #7123 has been updated by usa (Usaku NAKAMURA).


nari3, I committed your patch and RubyCI says it's OK.
Thank you for your kindly help!

----------------------------------------
Backport #7123: Segmentation fault in ruby 1.9.3-p194
https://bugs.ruby-lang.org/issues/7123#change-32861

Author: mscottford (M. Scott Ford)
Status: Closed
Priority: Normal
Assignee: authorNari (Narihiro Nakamura)
Category: 
Target version: 


Example source for this issue is posted at https://github.com/mscottford/segfault-test, with reproduction instructions.

I'm encountering a segmentation fault in ruby 1.9.3-p194 on a project using Rails 3.2.8. The issue is only happening on Mac OS X. Members of my team that are running Linux do not have the same issue. The issue does not occur consistently; it sometimes takes several (20+) runs for the crash to happen.

test:
```
require 'spec_helper'

describe Widget do
  it "removes widget on rejection" do
    widget = Widget.create!

    expect do
      widget.reject!
    end.to change { described_class.count }.by(-1)

    GC.start
  end
end
```

model:
```
class Widget < ActiveRecord::Base
  attr_accessor :check_rejection_reason

  state_machine :initial => :requested do
    # I suspect that the issue is related to the issue being accessed in this closure after it has been deleted
    around_transition :requested => :none do |gm, transition, blk|
      gm.check_rejection_reason = true
      blk.call
      gm.check_rejection_reason = false
    end

    # This closure deletes the instance, but it is still being accessed by the `around_transition` above.
    after_transition any => :none do |gm, transition|
      gm.destroy
    end

    on :reject do
      transition :requested => :none
    end
  end
end
```



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