From b4779307a2dc65a12c17205dbbc7e43efc2b99f7 Mon Sep 17 00:00:00 2001
From: Colin Campbell <colin@umn.edu>
Date: Thu, 10 Oct 2019 11:38:25 +1000
Subject: [PATCH] MDL-52189 file: skip deleting temp files that appear during
 cleanup

---
 lib/classes/task/file_temp_cleanup_task.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/classes/task/file_temp_cleanup_task.php b/lib/classes/task/file_temp_cleanup_task.php
index ac3359cda16..05bfd5cccbd 100644
--- a/lib/classes/task/file_temp_cleanup_task.php
+++ b/lib/classes/task/file_temp_cleanup_task.php
@@ -68,7 +68,7 @@ class file_temp_cleanup_task extends scheduled_task {
         // Now loop through again and remove old files and directories.
         for ($iter->rewind(); $iter->valid(); $iter->next()) {
             $node = $iter->getRealPath();
-            if (!is_readable($node)) {
+            if (!isset($modifieddateobject[$node]) || !is_readable($node)) {
                 continue;
             }