Description:
------------
If you have two seperate scripts with session_start() and you read one via fopen wrappers Apache webserver freezes.

Tested on
Apache/2.0.54 (Debian GNU/Linux)
Server API Apache 2.0 Handler
--enable-trans-sid
session.auto_start Off
session.bug_compat_42 On
session.name PHPSESSID
session.use_cookies On
session.use_only_cookies Off
session.use_trans_sid Off


Reproduce code:
---------------
script a.php
---
<?php

session_start();
$_SESSION["foo"] = "bar";
echo session_name() ."<br />";
echo session_id() ."<br />";
echo $_SESSION["foo"] ."<br />";

echo implode("", file("http://" . $_SERVER["HTTP_HOST"] . "/b.php?" . session_name() . "=" . session_id()));

?>
---

script b.php
---
<?php

session_start();
echo session_name() ."<br />";
echo session_id() ."<br />";
echo $_SESSION["foo"] ."<br />";

?>
---


Expected result:
----------------
PHPSESSID
some_session_id_here
bar
PHPSESSID
same_session_id_here
bar


Actual result:
--------------
Apache freezes, no heavy load, no error message, no logfile entry.