Bug #75914 [NEW]: Memory leak when anonymous function is assigned to the class variable

From: john357smith at gmail dot com Operating system: Linux PHP version: 7.2.2 Package: Performance problem Bug Type: Bug Bug description:Memory leak when anonymous function is assigned to the class variable Description: ------------ In case an anonymous function is assigned to the class variable (doesn't matter if public, private or protected) and a new class instance is created a memory is not freed at the end. To correctly free memory you have to set a class variable to null or call a garbage collector manually. See test script. Test script: --------------- class TestMem { public $class_var = null; public function __construct() { $this->class_var = function() { }; } } while (true) { $frame = new TestMem(); //$frame->class_var = null; //echo(gc_collect_cycles()."\n"); echo(memory_get_usage()."\n"); usleep(10000); } Expected result: ---------------- A memory usage is still on the same level. Actual result: -------------- A memory usage is constantly increasing. -- Edit bug report at https://bugs.php.net/bug.php?id=75914&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75914&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75914&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75914&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75914&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75914&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75914&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75914&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75914&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75914&r=support Expected behavior: https://bugs.php.net/fix.php?id=75914&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75914&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75914&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75914&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75914&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75914&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75914&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75914&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75914&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75914&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75914&r=mysqlcfg