From fa24fa8a3cb97aaa1baae0cd5efc0eb20c8fd93f Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Wed, 4 Oct 2017 09:58:49 +0200
Subject: [PATCH] [Cache] Fix race condition in TagAwareAdapter

---
 .../Component/Cache/Adapter/TagAwareAdapter.php       | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php b/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
index 1e0617ebe2..d8ea346038 100644
--- a/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
@@ -250,19 +250,12 @@ class TagAwareAdapter implements TagAwareAdapterInterface
 
             $f = $this->getTagsByKey;
             $tagsByKey = $f($items);
-            $deletedTags = $this->deferred = array();
+            $this->deferred = array();
             $tagVersions = $this->getTagVersions($tagsByKey);
             $f = $this->createCacheItem;
 
             foreach ($tagsByKey as $key => $tags) {
-                if ($tags) {
-                    $this->itemsAdapter->saveDeferred($f(static::TAGS_PREFIX.$key, array_intersect_key($tagVersions, $tags), $items[$key]));
-                } else {
-                    $deletedTags[] = static::TAGS_PREFIX.$key;
-                }
-            }
-            if ($deletedTags) {
-                $this->itemsAdapter->deleteItems($deletedTags);
+                $this->itemsAdapter->saveDeferred($f(static::TAGS_PREFIX.$key, array_intersect_key($tagVersions, $tags), $items[$key]));
             }
         }