--- zzzz-none-000/linux-3.10.107/fs/ocfs2/sysfile.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/ocfs2/sysfile.c	2021-02-04 17:41:59.000000000 +0000
@@ -113,9 +113,11 @@
 	} else
 		arr = get_local_system_inode(osb, type, slot);
 
+	mutex_lock(&osb->system_file_mutex);
 	if (arr && ((inode = *arr) != NULL)) {
 		/* get a ref in addition to the array ref */
 		inode = igrab(inode);
+		mutex_unlock(&osb->system_file_mutex);
 		BUG_ON(!inode);
 
 		return inode;
@@ -129,6 +131,7 @@
 		*arr = igrab(inode);
 		BUG_ON(!*arr);
 	}
+	mutex_unlock(&osb->system_file_mutex);
 	return inode;
 }