From: kazuki@...
Date: 2019-11-19T21:34:05+00:00
Subject: [ruby-dev:50867] [Ruby master Bug#16354] Memory corruption in	Enumerable#reverse_each

Issue #16354 has been reported by ktsj (Kazuki Tsujimoto).

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Bug #16354: Memory corruption in Enumerable#reverse_each
https://bugs.ruby-lang.org/issues/16354

* Author: ktsj (Kazuki Tsujimoto)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.5: REQUIRED, 2.6: REQUIRED
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Enumerable#reverse_eachのブロック呼び出し中に、対象のEnumerableをto_aしたものを捕まえてサイズを変更するとSEGVすることがあります。

```
$ ruby -e '(0...1000).reverse_each {|i| i.inspect; ObjectSpace.each_object(Array) {|a| a.clear if a.length == 1000 }}'
-e:1: [BUG] Segmentation fault at 0x0000000000005f19
```




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