Bug #81361 [NEW]: memory leak with anonymous function in an eval statement

From: zelnaga at gmail dot com Operating system: any PHP version: 8.0.9 Package: Performance problem Bug Type: Bug Bug description:memory leak with anonymous function in an eval statement 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 bug report at https://bugs.php.net/bug.php?id=81361&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81361&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81361&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81361&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81361&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81361&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81361&r=support Expected behavior: https://bugs.php.net/fix.php?id=81361&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81361&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81361&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81361&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81361&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81361&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81361&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81361&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81361&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81361&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81361&r=mysqlcfg