Bug #76982 [Com]: memory leak declaring closure in included file

Edit report at https://bugs.php.net/bug.php?id=76982&edit=1 ID: 76982 Comment by: goetas at gmail dot com Reported by: ryan dot brothers at gmail dot com Summary: memory leak declaring closure in included file Status: Verified Type: Bug Package: Scripting Engine problem Operating System: Linux PHP Version: 7.2.10 Block user comment: N Private report: N New Comment: I manage to reproduce consistently the issue on all PHP 7.x versions https://github.com/goetas/symfony-mem-leak contains the repo to reproduce the issue https://travis-ci.org/goetas/symfony-mem-leak/builds/551488795 is one build that shows the issue on Travis Discovered while trying to solve https://github.com/symfony/symfony/issues/32220 Previous Comments: ------------------------------------------------------------------------ [2019-05-27 21:28:19] tyler dot bannister at remote-learner dot net I'm seeing the same problem even when I don't use a closure and instead just assign a variable. I also saw the same problem, but to a lesser extent, with a print command. I filed a report for that in Bug #78076, but it seems like there may be a common problem related to repeated requires/includes? ------------------------------------------------------------------------ [2018-10-09 13:21:19] ryan dot brothers at gmail dot com Thanks for confirming. If it helps, the same problem also happens if you put "return;" as the first line of file2.php like the below, so it seems related to compiling perhaps, rather than executing. file2.php: <?php return; $test_function = function() { }; ------------------------------------------------------------------------ [2018-10-09 12:07:45] cmb@php.net This also happens on current master. It works fine if file2.php is inlined. Neither a debug build nor valgrind (ZEND_DONT_UNLOAD_MODULES=1 USE_ZEND_ALLOC=0) report a memory leak, though. ------------------------------------------------------------------------ [2018-10-08 02:40:59] ryan dot brothers at gmail dot com Description: ------------ I am running PHP 7.2.10 on CentOS 7. If I run the below script file1.php, the memory usage gradually increases until it hits the memory limit. The memory usage should remain relatively constant. It's related to declaring the closure in file2.php, as if I remove the closure, then the memory usage stays constant. Also, the memory usage stays constant in PHP 5.6, so the issue is perhaps only in PHP 7 and later. Test script: --------------- file1.php <?php for ($i = 0; $i < 1000000; $i++) { echo $i.' - '.number_format(memory_get_usage())."\n"; require('file2.php'); } file2.php: <?php $test_function = function() { }; Expected result: ---------------- Memory usage stays constant. Actual result: -------------- Memory usage increases until it hits the memory limit. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76982&edit=1