From: edipofederle@...
Date: 2021-05-13T00:16:09+00:00
Subject: [ruby-core:103810] [Ruby master Bug#17860] Segmentation fault when trying to grab blocks of memory using Fiddle

Issue #17860 has been reported by edipofederle (�dipo F�derle).

----------------------------------------
Bug #17860: Segmentation fault when trying to  grab blocks of memory using Fiddle
https://bugs.ruby-lang.org/issues/17860

* Author: edipofederle (�dipo F�derle)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0dev (2021-04-09T04:59:46Z master 582f4bc188) [x86_64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Reproduce process

**ruby version:** ruby 3.1.0dev (2021-04-09T04:59:46Z master 582f4bc188) [x86_64-darwin20]


Install ruby with:

```
$ git clone git@github.com:ruby/ruby.git
$ cd ruby
$ autoconf
$ ./configure --prefix=$PWD/local
$ make
$ make install 
```

create a test.rb file with:

```
require 'fiddle'
str = "Hello world!"
str_ptr_int = str.object_id << 1

str_ptr = Fiddle::Pointer.new str_ptr_int
str_ptr.to_i == str_ptr_int

r_basic = str_ptr[0, Fiddle::SIZEOF_LONG*2]
```

Inside compiled `ruby` directly run: 

`$  ./local/bin/ruby test.rb`




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