diff -r 6aca4d1c744e -r 9baf4330d88f mercurial/sshpeer.py
--- a/mercurial/sshpeer.py	Thu Feb 28 10:12:26 2013 -0800
+++ b/mercurial/sshpeer.py	Fri Mar 08 16:59:36 2013 -0800
@@ -70,7 +70,10 @@
                 (_serverquote(remotecmd), _serverquote(self.path))))
         ui.note(_('running %s\n') % cmd)
         cmd = util.quotecommand(cmd)
-        self.pipeo, self.pipei, self.pipee = util.popen3(cmd)
+
+        # while self.subprocess isn't used, having it allows the subprocess to
+        # to clean up correctly later
+        self.pipeo, self.pipei, self.pipee, self.subprocess = util.popen4(cmd)
 
         # skip any noise generated by remote shell
         self._callstream("hello")