OS X Yosemite / Node.js v4.0.0 / Segfault - See https://github.com/node-ffi/node-ffi/issues/239

binding.cc

#include <node.h>
#include <node_buffer.h>
#include <nan.h>
#include <dlfcn.h>
#include <stdio.h>

using namespace v8;
using namespace node;


/*
 * Called when the wrapped pointer is garbage collected.
 * We never have to do anything here...
 */

void wrap_pointer_cb(char *data, void *hint) {
  //fprintf(stderr, "wrap_pointer_cb\n");
}

/*
 * Converts an arbitrary pointer to a node Buffer with 0-length
 */

Local<Value> WrapPointer(char *ptr) {
  Nan::EscapableHandleScope scope;
  return scope.Escape(Nan::NewBuffer(ptr, 0, wrap_pointer_cb, NULL).ToLocalChecked());
}

NAN_MODULE_INIT(init) {
  Nan::HandleScope scope;

  // dl functions used by the DynamicLibrary JS class
  target->Set(Nan::New<String>("dlopen").ToLocalChecked(),  WrapPointer((char *)printf));
  target->Set(Nan::New<String>("dlclose").ToLocalChecked(), WrapPointer((char *)dlclose));
  target->Set(Nan::New<String>("dlsym").ToLocalChecked(),   WrapPointer((char *)dlsym));
  target->Set(Nan::New<String>("dlerror").ToLocalChecked(), WrapPointer((char *)dlerror));
}

NODE_MODULE(binding, init)

binding.gyp

{
  'targets': [
    {
      'target_name': 'binding',
      'sources': [
          'binding.cc'
      ],
      'include_dirs': [
        '<!(node -e "require(\'nan\')")'
      ],
    }
  ]
}

package.json

{
  "name": "node-v4-buffer-segfault-osx",
  "version": "1.0.0",
  "description": "Reduced test case for weird Node.js v4 segfault on OS X related to Buffer usage in C++",
  "main": "t.js",
  "repository": {
    "type": "git",
    "url": "git://gist.github.com/e0eb7a55546c25a58990.git"
  },
  "license": "MIT"
}

t.js

#!/usr/bin/env node --expose-gc

/**
 * Run with `--expose-gc` flag.
 */

var b = require('./build/Release/binding');
gc();
// gc() causes a `Segmentation fault: 11` on OS X 10.10.5

Fixed (a week ago) in nodejs/node#2791.