Issue #10727 has been reported by Kohei Suzuki.

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Bug #10727: Segfault with newlines + multibyte characters in exception message
https://bugs.ruby-lang.org/issues/10727

* Author: Kohei Suzuki
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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In Ruby 2.2.0, this simple Ruby script results in segfault.

```ruby
class E < StandardError
  def initialize
    super("にほんご\n改行")
  end
end

raise E
```

It's caused by r48637.



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