#32403 [Fbk->NoF]: PHP does not free memory, occupied by cross-referencing objects

ID: 32403 Updated by: php-bugs@lists.php.net Reported By: valyala at tut dot by -Status: Feedback +Status: No Feedback Bug Type: Zend Engine 2 problem Operating System: any PHP Version: 5.x New Comment: No feedback was provided for this bug for over a week, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open". Previous Comments: ------------------------------------------------------------------------ [2005-03-25 02:01:40] sniper@php.net Please try using this CVS snapshot: http://snaps.php.net/php5-latest.tar.gz For Windows: http://snaps.php.net/win32/php5-win32-latest.zip As you were very clever and left all the PHP version information open (there is no such PHP version as 'Irrelevant'), we now have no idea on what version you experienced this with first. So try the snapshot. ------------------------------------------------------------------------ [2005-03-21 22:41:22] valyala at tut dot by Description: ------------ See reproducible code below Reproduce code: --------------- <? /** cross-referencing memory leak. PHP garbage collector doesn't free memory for cross-referencing objects. It could be great problem for daemons or services, written on PHP */ function memleak($size) { $a = str_repeat('a', $size); // construct child $child = array( 'data' => $a, ); // construct parent $parent = array( 'data' => $a, 'child' => &$child, ); // comment following line to prevent memleak $child['parent'] = &$parent; } // try to leak of 1GB memory for ($i = 0; $i < 1000; $i++) memleak(1000000); sleep(10); ?> Expected result: ---------------- normal execution of script Actual result: -------------- PHP occupies all available memory. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=32403&edit=1