Bug #76946 [NEW]: Cyclic reference in generator not detected

From: sam at mousa dot nl Operating system: Alpine PHP version: 7.2.10 Package: Reproducible crash Bug Type: Bug Bug description:Cyclic reference in generator not detected Description: ------------ When a specifically structured cyclic reference is created the garbage collector fails to detect it which causes the references to never be freed. This leads to a memory leak. Test script: --------------- https://github.com/SamMousa/yii2-bug-sample/blob/master/nodatabase.php Expected result: ---------------- I'd expect it to never run out of memory; it repeatedly calls a closure that: - Does not access globals - Creates an object that goes out of scope Actual result: -------------- The instances created by the closure never get destroyed, even when explicitly calling gc_collect_cycles. -- Edit bug report at https://bugs.php.net/bug.php?id=76946&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76946&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76946&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76946&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76946&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76946&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76946&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76946&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76946&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76946&r=support Expected behavior: https://bugs.php.net/fix.php?id=76946&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76946&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76946&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76946&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76946&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76946&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76946&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76946&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76946&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76946&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76946&r=mysqlcfg