From ec93b9a7f722b57f86912fd317aab3c2c9027d9e Mon Sep 17 00:00:00 2001
From: Filippo Tessarotto <zoeslam@gmail.com>
Date: Wed, 2 Dec 2015 10:09:02 +0100
Subject: [PATCH] [Process] Unset callback after stop to free memory

---
 src/Symfony/Component/Process/Process.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index 676cddc67e..a743e21e34 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1136,6 +1136,11 @@ class Process
             $this->exitcode = 128 + $this->processInformation['termsig'];
         }
 
+        // Free memory from self-reference callback created by buildCallback
+        // Doing so in other contexts like __destruct or by garbage collector is ineffective
+        // Now pipes are closed, so the callback is no longer necessary
+        $this->callback = null;
+
         return $this->exitcode;
     }