Description:
------------
the xmlreader open call will function correctly for about 15-30minutes after starting php-fpm. After that it will not even try to access the remote url and fail with an "failed to load external entity" error.
In an strace i can sometimes see that it will do a 'stat' system call on the url (which is quite weird) but will not even try to do anything else.
When i restart php-fpm it will work immediately again for about 30 min.
The wsdl file in the test is just a public weather api i used for reproducing.
We initially encountered this problem within SOAPClient but could track it down to XMLReader.


System is a CentOS 7 with all updates (as of 15.01.15) and a php-5.5.20 compiled with:
./configure  --prefix=/home/php-${version} --with-mysql --with-gd --with-curl --with-zlib --with-jpeg-dir=/usr/lib/ --with-iconv --with-pdo-mysql=mysqlnd --with-openssl --enable-mbstring --with-mysqli --with-gettext --enable-sockets --with-mcrypt --with-freetype-dir=/usr --enable-soap --with-xsl --enable-opcache --with-oci8=instantclient,/usr/lib/oracle/12.1/client64/lib --enable-sysvsem --enable-fpm --enable-pcntl --enable-bcmath --with-gmp

Test script:
---------------
<?php

function loadXML() {
  try {
    $xml = new XMLReader();
    $xml->open("http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL");
    $xml->setParserProperty(XMLReader::VALIDATE, true);
    var_dump($xml->isValid()) . "\n";
    return null;
  } catch (Exception $e) {
    return $e;
  }
}


$start = new DateTime();
echo "Start: ". $start->format('Y-m-d H:i:s') ."\n";
$e = loadXML();
var_dump($e);