Description:
------------
I use `` or popen, the script will evaluate the whole script then hang until script time limit expires.
The error kicks in everytime.
The error didn't exist prior to 5.2.3


Reproduce code:
---------------
Needed:
<?php
$tasks = `schtasks`;
?>

But happens even:

<?php
`dir`;
?>

Expected result:
----------------
For both scripts the evaluation should be last less than a second.

Actual result:
--------------
Scripts hang until script time limit expires and then die with the following error (seen only when I used command line, not seen if run from Apache module):

Error in my_thread_global_end(): 1 threads didn't exit