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Bug #68838 XMLReader::open stops working under php-fpm after about 30min
Submitted: 2015-01-15 15:50 UTC Modified: 2015-01-19 09:19 UTC
Avg. Score:3.0 ± 2.0
Reproduced:1 of 2 (50.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: fs at gigacodes dot de Assigned:
Status: Open Package: XML Reader
PHP Version: 5.5.20 OS: Centos 7
Private report: No CVE-ID: None
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 [2015-01-15 15:50 UTC] fs at gigacodes dot de
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:

function loadXML() {
  try {
    $xml = new XMLReader();
    $xml->setParserProperty(XMLReader::VALIDATE, true);
    var_dump($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();


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 [2015-01-16 21:06 UTC]
Do you have any idea if it's just time based, or is it related to the number of requests made?

And have you ever seen the same behaviour when running a test from the CLI?
 [2015-01-19 09:19 UTC] fs at gigacodes dot de
It seems to only be somewhat time-based. I tried calling the script once per second and it occured after 15min and when i called every 30 sec it was the same.
The problem does not occur on cli! I enclosed the script in a for loop and let it run for 2h without problems. Same thing when it's a for loop in the fpm script.
The problem only seems to occur when using separate requests to fpm.
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Last updated: Thu Jul 18 06:01:25 2019 UTC