Bug #62242 [NEW]: Memory Leak in xml_parser_create_ns()

From: martinhv at arcor dot de Operating system: Debian wheezy/sid PHP version: 5.4Git-2012-06-06 (snap) Package: XML related Bug Type: Bug Bug description:Memory Leak in xml_parser_create_ns() Description: ------------ The function xml_parser_create_ns() use memory that doesn't freed after xml_parser_free() is called. This memory isn't registered by php and the function memory_get_usage() doesn't report it. But you can see the eating memory via the ps command. (See the actual result below) If the function xml_parser_create() is used, the used memory stagnates to a constant value. So no memory leak exists. (See the expected result below) If no xml_set_element_handler() is called, there isn't a memory leak, too. So only the combination of xml_parser_create_ns() with xml_set_element_handler() produced a memory leak! I tested with the PHP snapshot 5.4 from 2012-06-05 on Debian Wheezy Alpha1 with libxml2 version 2.7.8.dfsg-9.1. But many other PHP versions reproduce the bug, too. Test script: --------------- #!/usr/local/bin/php <?php $xml='<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <root xmlns="http://test/ns"> <test name="Name" value="Value" key="Key" id="Id" test="Test"/> <test name="Name" value="Value" key="Key" id="Id" test="Test"/> <test name="Name" value="Value" key="Key" id="Id" test="Test"/> </root>'; for ($i=0; $i<10000; $i++) { $xml_parser = xml_parser_create_ns('utf-8', '@'); xml_set_element_handler($xml_parser, 'start_tag_handler', 'end_tag_handler'); xml_parse($xml_parser, $xml, true); xml_parser_free($xml_parser); $xml_parser = NULL; if (($i % 1000) == 0) echo "memory_get_usage(): ".memory_get_usage(true)." bytes\n". "real memory size: ".(exec("ps h -C test2.php -o rsz")*1024)." bytes\n"; } function start_tag_handler($parser, $name, $attribs) { } function end_tag_handler($parser, $name) { } ?> Expected result: ---------------- memory_get_usage(): 262144 bytes real memory size: 3743744 bytes memory_get_usage(): 262144 bytes real memory size: 3743744 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes memory_get_usage(): 262144 bytes real memory size: 3796992 bytes Actual result: -------------- memory_get_usage(): 262144 bytes real memory size: 3772416 bytes memory_get_usage(): 262144 bytes real memory size: 4222976 bytes memory_get_usage(): 262144 bytes real memory size: 4657152 bytes memory_get_usage(): 262144 bytes real memory size: 5091328 bytes memory_get_usage(): 262144 bytes real memory size: 5750784 bytes memory_get_usage(): 262144 bytes real memory size: 6225920 bytes memory_get_usage(): 262144 bytes real memory size: 6656000 bytes memory_get_usage(): 262144 bytes real memory size: 7090176 bytes memory_get_usage(): 262144 bytes real memory size: 7524352 bytes memory_get_usage(): 262144 bytes real memory size: 7958528 bytes -- Edit bug report at https://bugs.php.net/bug.php?id=62242&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=62242&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=62242&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=62242&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=62242&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=62242&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=62242&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=62242&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=62242&r=needscript Try newer version: https://bugs.php.net/fix.php?id=62242&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=62242&r=support Expected behavior: https://bugs.php.net/fix.php?id=62242&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=62242&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=62242&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=62242&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=62242&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=62242&r=dst IIS Stability: https://bugs.php.net/fix.php?id=62242&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=62242&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=62242&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=62242&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=62242&r=mysqlcfg