Bug #62468 [NEW]: SimpleXML memory leak, if circular references are removed by Garbage Collector

From: zerkyn at gmail dot com Operating system: Windows 7, Linux PHP version: 5.3.14 Package: SimpleXML related Bug Type: Bug Bug description:SimpleXML memory leak, if circular references are removed by Garbage Collector Description: ------------ The SimpleXMLElement memory leaks, when: 1) An object holds reference to a SimpleXMLElement, and 2) The object is involved in a circular references net, and 3) All external references to that net are cleared, so Garbage Collector finds that net, correctly sees it as a garbage cycle, and cleans all its objects After the Garbage Collector finishes its work, the memory, consumed by SimpleXMLElement is not freed, thus producing a memory leak. The issue is reproduced both at Windows and Linux platforms. Full version for the test script is there: https://dl.dropbox.com/u/17950262/php/issues/simplexml_memory_leak.zip Test script: --------------- <?php class SelfLinked { public $xml; public $me; public function __construct() { $this->xml = simplexml_load_file('pretty_big_file_of_1mb_size.xml'); $this->me = $this; } } echo "Sys memory usage before: ", SystemMemoryUsage(), "\n"; for ($i = 0; $i < 1000; $i++) { $a = new SelfLinked(); unset($a); gc_collect_cycles(); } echo "Sys memory usage after: ", SystemMemoryUsage(), "\n"; /** ----------------------------------------------------- */ function SystemMemoryUsage() { ... // Return memory consumption by executing system tool - tasklist, ps or anything else // See https://bugs.php.net/bug.php?id=62467 on proper memory profiling of SimpleXML functions } } Expected result: ---------------- Memory consumption does not change. Actual result: -------------- Huge increase of memory consumption is reported. -- Edit bug report at https://bugs.php.net/bug.php?id=62468&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=62468&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=62468&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=62468&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=62468&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=62468&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=62468&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=62468&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=62468&r=needscript Try newer version: https://bugs.php.net/fix.php?id=62468&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=62468&r=support Expected behavior: https://bugs.php.net/fix.php?id=62468&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=62468&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=62468&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=62468&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=62468&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=62468&r=dst IIS Stability: https://bugs.php.net/fix.php?id=62468&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=62468&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=62468&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=62468&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=62468&r=mysqlcfg