src: OnFatalError handler must abort()

We are in an unrecoverable state if v8 throws a FatalError, actually
ask the operating system to dump core in this case.

Fixes #6836

src/node.cc

@@ -1914,7 +1914,7 @@ static void OnFatalError(const char* location, const char* message) {
   } else {
     fprintf(stderr, "FATAL ERROR: %s\n", message);
   }
-  exit(5);
+  abort();
 }
 
 void FatalException(TryCatch &try_catch) {

test/simple/test-abort-fatal-error.js

@@ -0,0 +1,39 @@
+// Copyright Joyent, Inc. and other Node contributors.
+
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var assert = require('assert');
+var common = require('../common');
+
+if (process.platform === 'win32') {
+  console.log('skipping test on windows');
+  process.exit(0);
+}
+
+var exec = require('child_process').exec;
+
+var cmdline = 'ulimit -c 0; ' + process.execPath;
+cmdline += ' --max-old-space-size=1 --max-new-space-size=1';
+cmdline += ' -e "setInterval(function() { new Buffer(1024); }, 1);"';
+
+exec(cmdline, function(err, stdout, stderr) {
+  assert(err);
+  assert(stderr.toString().match(/abort/i));
+});