Bug #73659 [NEW]: Recursive call leaks memory

From: grzegorz129 at gmail dot com Operating system: Linux PHP version: 7.1.0 Package: Performance problem Bug Type: Bug Bug description:Recursive call leaks memory Description: ------------ I've found very strange behavior, which is (unfortunately) consistent across multiple PHP versions: https://3v4l.org/ppe5R Test script: --------------- <?php gc_enable(); echo memory_get_usage(true)/1024 . "\n"; function callFunc($i = 0) { if ($i < 100000) { gc_collect_cycles(); callFunc(++$i); } } callFunc(); gc_collect_cycles(); echo memory_get_usage(true)/1024 . "\n"; callFunc(); gc_collect_cycles(); echo memory_get_usage(true)/1024 . "\n"; Expected result: ---------------- Memory should be freed after recursion. Actual result: -------------- Memory is retained during lifetime of a recursion, but it's never freed. -- Edit bug report at https://bugs.php.net/bug.php?id=73659&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73659&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73659&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73659&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73659&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73659&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73659&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73659&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73659&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73659&r=support Expected behavior: https://bugs.php.net/fix.php?id=73659&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73659&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73659&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73659&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73659&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73659&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73659&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73659&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73659&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73659&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73659&r=mysqlcfg