Bug #76481 [NEW]: XMLReader::expand leaks memory over HTTP (but not over CLI)

From: tom dot denbraber at moxio dot com Operating system: Debian 9.4 PHP version: 7.2.6 Package: XML Reader Bug Type: Bug Bug description:XMLReader::expand leaks memory over HTTP (but not over CLI) Description: ------------ XMLReader::expand does not free its allocated memory. When executing the test script below using the CLI, the memory usage is as expected. However, when serving the same script over HTTP (via Apache or nginx), the XMLreader::expand function does not free its memory. For larger XMLs, this is a problem. Because the problem only occurs when serving the script over HTTP, I do not know whether this is a 'Network Functions'-issue, and 'XML Reader'-issue or a 'Web Server'-issue. Feel free to re-categorize. Test script: --------------- <?php $xml_string = "<?xml version=\"1.0\"?> <items>"; for ($i = 0; $i < 50000; $i++) { $xml_string .= sprintf("<item id=\"bk%d\"></item>", $i); } $xml_string .= "</items>"; $reader = new XMLReader(); $reader->XML($xml_string); print memory_get_usage() . "\n"; while ($reader->read() === true) { $node = $reader->expand(); } print memory_get_usage() . "\n"; Expected result: ---------------- The first and second memory-usage prints should be roughly equal to each other (this happens when executing the script using the CLI). Actual result: -------------- When executed over HTTP, the second memory usage is a lot higher than the memory usage that was printed first. For the given script, often up to 66% higher. -- Edit bug report at https://bugs.php.net/bug.php?id=76481&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76481&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76481&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76481&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76481&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76481&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76481&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76481&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76481&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76481&r=support Expected behavior: https://bugs.php.net/fix.php?id=76481&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76481&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76481&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76481&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76481&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76481&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76481&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76481&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76481&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76481&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76481&r=mysqlcfg