--- old/src/hotspot/share/memory/filemap.cpp	2019-07-22 11:12:42.671453917 -0700
+++ new/src/hotspot/share/memory/filemap.cpp	2019-07-22 11:12:42.356424086 -0700
@@ -1610,7 +1610,9 @@
   }
 
   init_from_file(_fd, is_static);
-  if (!validate_header(is_static)) {
+  // UseSharedSpaces could be disabled if the checking of some of the header fields in
+  // init_from_file has failed.
+  if (!UseSharedSpaces || !validate_header(is_static)) {
     return false;
   }
   return true;