#48643 [Opn]: Memory not freed with FilterIterator

ID: 48643 User updated by: zoe@php.net Reported By: zoe@php.net Status: Open Bug Type: SPL related Operating System: Linux (Ubuntu) PHP Version: 5.2CVS-2009-06-22 (CVS) New Comment: A checkout of PHP53 from the 25th June 2008 does *not* have the problem A checkout of PHP53 from the 26th June 2008 *does* have the problem Previous Comments: ------------------------------------------------------------------------ [2009-06-23 14:13:37] robin_fernandes at uk dot ibm dot com Testcase below shows that the issue relates to an implicit cast to string on an SplFileInfo object when retrieved from a RecursiveDirectoryIterator during iteration. <?php $rdi = new RecursiveDirectoryIterator('/manyFiles'); echo "SplFileInfo explicit cast to string: "; foreach ($rdi as $v) { strlen((string)$v); } //OK echo memory_get_usage(true) . PHP_EOL; echo "SplFileInfo implicit cast to string: "; foreach ($rdi as $v) { strlen($v); } //Leaky echo memory_get_usage(true) . PHP_EOL; ?> php52: SplFileInfo explicit cast to string: 262144 SplFileInfo implicit cast to string: 262144 php53: SplFileInfo explicit cast to string: 524288 SplFileInfo implicit cast to string: 6291456 ------------------------------------------------------------------------ [2009-06-23 13:02:34] zoe@php.net Looking backwards through PHP builds I have currently narrowed this down to a change that went in to PHP 5.3 somewhere between the 12th June 2008 and the 1st July 2008. ------------------------------------------------------------------------ [2009-06-23 12:13:49] robin_fernandes at uk dot ibm dot com Below is a simplified testcase which I think exposes the same leak. '/manyFiles' is a directory containing 10000 files. <?php $rii = new RecursiveIteratorIterator( new RecursiveDirectoryIterator('/manyFiles') ); function noop() {} echo "noop call in loop (no leak) : "; foreach ($rii as $v) { noop($v); } echo memory_get_usage() . PHP_EOL; echo "strlen call in loop (leak on 53) : "; foreach ($rii as $v) { strlen($v); } echo memory_get_usage() . PHP_EOL; ?> Output on php52: noop call in loop (no leak) : 66176 strlen call in loop (leak on 53) : 66176 Output on php53: noop call in loop (no leak) : 337448 strlen call in loop (leak on 53) : 6028496 ------------------------------------------------------------------------ [2009-06-22 14:33:05] zoe@php.net I tested with PHP 5.2 but do not see the same issue. I believe this is specific to PHP 5.3. ------------------------------------------------------------------------ [2009-06-22 12:32:02] zoe@php.net By the way, I traced the memory consumption using xdebug: xdebug.auto_trace = on; xdebug.show_mem_delta = on; The first few lines are here http://pastebin.ca/1469804 This makes it look more like a bug with the way the accept() method is invoked inside PhptFilterIterator. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/48643 -- Edit this bug report at http://bugs.php.net/?id=48643&edit=1