From 42fa0a65403a14ecae8b2a50908944cd4d400b9a Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Wed, 12 Feb 2014 21:31:05 -0800
Subject: [PATCH] core: poll for process exit on SSH#exec with subprocess

---
 lib/vagrant/util/ssh.rb | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/vagrant/util/ssh.rb b/lib/vagrant/util/ssh.rb
index 487b972b0..9809b0d91 100644
--- a/lib/vagrant/util/ssh.rb
+++ b/lib/vagrant/util/ssh.rb
@@ -174,7 +174,13 @@ module Vagrant
         process = ChildProcess.build("ssh", *command_options)
         process.io.inherit!
         process.start
-        process.wait
+
+        # Poll for exited rather than call #wait because #wait will hold
+        # the GIL, locking up the entire Ruby VM. See ChildProcess #68
+        while !process.exited?
+          sleep 0.2
+        end
+
         return process.exit_code
       end
     end