diff --git a/.travis.yml b/.travis.yml
index 7ca571e707..15ce1738ac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -157,15 +157,14 @@ before_install:
           fi
           if [[ $PHP = nightly ]]; then
               tfold ext.memcached tpecl memcached-3.1.5 memcached.so $INI
-              tfold ext.apcu install_apcu_dev 9c36db45100d4d27ec33072f4be90f1f5a0108b7 $INI
           else
-              tfold ext.apcu tpecl apcu-5.1.19 apcu.so $INI
               tfold ext.mongodb tpecl mongodb-1.6.16 mongodb.so $INI
               tfold ext.zookeeper tpecl zookeeper-0.7.2 zookeeper.so $INI
               tfold ext.amqp tpecl amqp-1.10.2 amqp.so $INI
               tfold ext.redis tpecl redis-5.2.2 redis.so $INI "no"
           fi
 
+          tfold ext.apcu tpecl apcu-5.1.19 apcu.so $INI
           tfold ext.igbinary tpecl igbinary-3.1.6 igbinary.so $INI
       done
     - |
diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 0bfe180464..aaf62d0267 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -175,7 +175,7 @@ class Filesystem
                 if (!self::box('rmdir', $file) && file_exists($file)) {
                     throw new IOException(sprintf('Failed to remove directory "%s": ', $file).self::$lastError);
                 }
-            } elseif (!self::box('unlink', $file) && file_exists($file)) {
+            } elseif (!self::box('unlink', $file) && (false !== strpos(self::$lastError, 'Permission denied') || file_exists($file))) {
                 throw new IOException(sprintf('Failed to remove file "%s": ', $file).self::$lastError);
             }
         }
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
index dcd6a393a9..68542d7b5c 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Filesystem\Tests;
 
+use Symfony\Component\Filesystem\Exception\IOException;
+
 /**
  * Test class for Filesystem.
  */
@@ -334,6 +336,28 @@ class FilesystemTest extends FilesystemTestCase
         $this->assertFileDoesNotExist($basePath.'dir');
     }
 
+    public function testRemoveThrowsExceptionOnPermissionDenied()
+    {
+        $this->markAsSkippedIfChmodIsMissing();
+
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR.'dir_permissions';
+        mkdir($basePath);
+        $file = $basePath.\DIRECTORY_SEPARATOR.'file';
+        touch($file);
+        chmod($basePath, 0400);
+
+        try {
+            $this->filesystem->remove($file);
+            $this->fail('Filesystem::remove() should throw an exception');
+        } catch (IOException $e) {
+            $this->assertStringContainsString('Failed to remove file "'.$file.'"', $e->getMessage());
+            $this->assertStringContainsString('Permission denied', $e->getMessage());
+        } finally {
+            // Make sure we can clean up this file
+            chmod($basePath, 0777);
+        }
+    }
+
     public function testRemoveCleansInvalidLinks()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
diff --git a/src/Symfony/Component/HttpClient/Tests/HttpClientTestCase.php b/src/Symfony/Component/HttpClient/Tests/HttpClientTestCase.php
index 23e64690ef..dbfba52da8 100644
--- a/src/Symfony/Component/HttpClient/Tests/HttpClientTestCase.php
+++ b/src/Symfony/Component/HttpClient/Tests/HttpClientTestCase.php
@@ -243,6 +243,14 @@ abstract class HttpClientTestCase extends BaseHttpClientTestCase
         sleep('\\' === \DIRECTORY_SEPARATOR ? 10 : 1);
 
         if (!$process->isRunning()) {
+            if ('\\' !== \DIRECTORY_SEPARATOR && 127 === $process->getExitCode()) {
+                self::markTestSkipped('vulcain binary is missing');
+            }
+
+            if ('\\' !== \DIRECTORY_SEPARATOR && 126 === $process->getExitCode()) {
+                self::markTestSkipped('vulcain binary is not executable');
+            }
+
             self::markTestSkipped((new ProcessFailedException($process))->getMessage());
         }