Bug #81361 [Opn->Dup]: memory leak with anonymous function in an eval statement

Edit report at https://bugs.php.net/bug.php?id=81361&edit=1 ID: 81361 Updated by: nikic@php.net Reported by: zelnaga at gmail dot com Summary: memory leak with anonymous function in an eval statement -Status: Open +Status: Duplicate Type: Bug Package: Performance problem Operating System: any PHP Version: 8.0.9 Block user comment: N Private report: N New Comment: Duplicate of bug #76982. Previous Comments: ------------------------------------------------------------------------ [2021-08-14 22:36:30] zelnaga at gmail dot com Description: ------------ eval('return function() {};') seems to create a memory leak. If I replace eval('return function() {};'); with function() {}; there's no memory leak but if I replace eval('return function() {};'); with $a = eval('return function() {};'); unset($a); there is still. So it's like the eval() is what's causing the issue. Per https://3v4l.org/3p4sl apparently this code didn't start leaking until PHP 7.4. Test script: --------------- <?php while (true) { eval('return function() {};'); gc_collect_cycles(); $new = memory_get_usage(); if (isset($old)) { echo ($new - $old) . "\n"; } $old = $new; } ?> Expected result: ---------------- I would expect this to output a bunch of 0's, one after the other. Actual result: -------------- 432 is output over and over and over again, indicating that each new pass is consuming an additional 432 bytes than the last one. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81361&edit=1