[ruby-core:61228] [ruby-trunk - Bug #9568] Ruby interpreter crashes when executing a script in debug mode

Issue #9568 has been updated by Tomoyuki Chikanaga.

Backport changed from 1.9.3: REQUIRED, 2.0.0: REQUIRED, 2.1: REQUIRED to 1.9.3: REQUIRED, 2.0.0: DONE, 2.1: REQUIRED

r45178, r45179, r45180 and r45183 were backported to ruby_2_0_0 at r45251.

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Bug #9568: Ruby interpreter crashes when executing a script in debug mode
https://bugs.ruby-lang.org/issues/9568#change-45576

* Author: Scott Thompson
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-02-26 trunk 45176) [x86_64-darwin13.0]
* Backport: 1.9.3: REQUIRED, 2.0.0: DONE, 2.1: REQUIRED
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The following script will crash the ruby interpreter when ruby is run in debug mode. 
This script is creating mock HTTP objects and creating the Response class out of the middle of the Savon gem and calling a private method in a very odd way because it is a reduced test case pulled from a much larger script.  The actual script use Savon in a much more conventional way:

-- crash_example.rb --

```ruby
require 'savon'

class SampleHTTPStuff
  def error?
    return true
  end
  
  def code
    return 500
  end

  def body
    return %q{<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Body><SOAP-ENV:Fault><faultcode>SOAP-ENV:Server</faultcode><faultstring>Internal Error</faultstring></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope>}
  end
end

http = SampleHTTPStuff.new()
response = Savon::Response.new(http, {}, {})

begin
  response.instance_eval { raise_soap_and_http_errors! }
rescue => e
  puts "Ouch!"
end
```
--- end of crash_example.rb

For what it's worth, I'm using version 2.3.3 of the Savon gem.

If I run this using:

```sh
ruby -d crash_example.rb
```

I get a segmentation fault error.  The problem appears to be the result of calling vm_throw with the "throwobj" having the value 0x8

If I run the script without the "-d" debug flag, the script runs without trouble.

I am running this on Mac OS X 10.9.1 on a MacBook Pro Retina 15"

using RVM I have tried the same code on 2.0, 2.1, and the 2.2dev head (as of 2/25/2014).  They all exhibit the same behavior

I've attached a transcript file of the code being run.

---Files--------------------------------
crash_transcript.txt (35.1 KB)


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