From: s.wanabe@...
Date: 2017-04-09T21:54:37+00:00
Subject: [ruby-core:80627] [Ruby trunk Bug#13412] Infinite recursion with define_method may cause silent SEGV or cfp consistency error

Issue #13412 has been updated by wanabe (_ wanabe).


> Duplicates Bug #13164: A second `SystemStackError` exception results in `Segmentation fault (core dumped)` added

#13164 is very much like this issue, but not quite the same.
Because this issue doesn't occur without `define_method`.

The followning script works fine, loops infinitely.

```
def foo; foo; end

loop do
  1.times do
    1.times do
      begin
        foo
      rescue Exception
        nil
      end
    end
  end
end
```

And another following script may cause "cfp consistency error" in rare cases. (5% or lower ?)

```
define_method(:foo) { foo }

1.times do
  1.times do
    begin
      foo
    rescue Exception
      nil
    end
  end
end
```

----------------------------------------
Bug #13412: Infinite recursion with define_method may cause silent SEGV or cfp consistency error
https://bugs.ruby-lang.org/issues/13412#change-64138

* Author: wanabe (_ wanabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-04-09 trunk 58286) [x86_64-linux]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
The script causes silent (no output [BUG]) SEGV or "cfp consistency error" on my environment.

```
define_method(:foo) { foo }

loop do
  1.times do
    1.times do
      begin
        foo
      rescue Exception
        nil
      end
    end
  end
end
```

I think this is related to #11430 (maybe same).



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