Bug #71737 [NEW]: Memory leak in closure with parameter named $this

From: james dot harris at icecave dot com dot au Operating system: OSX PHP version: 7.0.4 Package: Scripting Engine problem Bug Type: Bug Bug description:Memory leak in closure with parameter named $this Description: ------------ A memory leak occurs when a closure that is defined inside a class and has a parameter named $this is invoked with a value that contains a reference to $this. This gist (https://gist.github.com/jmalloc/e3db5842c2c4ab2a1edf) might help explain a little better. Affected PHP versions: https://3v4l.org/lr963 Test script: --------------- class MemoryLeak { public function bad() { $closure = function ($this) {}; $closure([$this]); } } $object = new MemoryLeak; ini_set('memory_limit', '10M'); for ($i = 0; $i < 1000000; ++$i) { $object->bad(); } echo "Done" . PHP_EOL; Expected result: ---------------- Done Actual result: -------------- Fatal error: Allowed memory size of 10485760 bytes exhausted (tried to allocate 4096 bytes) in /Users/james/<snip>/leak.php on line 8 -- Edit bug report at https://bugs.php.net/bug.php?id=71737&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71737&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71737&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71737&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71737&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71737&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71737&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71737&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71737&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71737&r=support Expected behavior: https://bugs.php.net/fix.php?id=71737&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71737&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71737&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71737&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71737&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71737&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71737&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71737&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71737&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71737&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71737&r=mysqlcfg