From: spiketeika@...
Date: 2018-05-14T00:12:34+00:00
Subject: [ruby-core:87013] [Ruby trunk Bug#14756] `Exception` may cause SEGV when `#backtrace` returns a string

Issue #14756 has been reported by yui-knk (Kaneko Yuichiro).

----------------------------------------
Bug #14756: `Exception` may cause SEGV when `#backtrace` returns a string
https://bugs.ruby-lang.org/issues/14756

* Author: yui-knk (Kaneko Yuichiro)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-05-13 trunk 63413) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
This code causes SEGV, because `print_backtrace` expects second argument to be an array but a string is given.

```ruby
class Exception
  def backtrace
    "backtrace"
  end
end

"".a
```

Also in ruby 2.3.7, 2.4.4, 2.5.1.



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