*** old/src/hotspot/share/classfile/classLoader.cpp	Tue May 22 15:03:42 2018
--- new/src/hotspot/share/classfile/classLoader.cpp	Tue May 22 15:03:42 2018

*** 709,720 ****
--- 709,723 ----
  
  // Add a module path to the _module_path_entries list.
  void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
    assert(DumpSharedSpaces, "dump time only");
    struct stat st;
!   int ret = os::stat(path, &st);
    assert(ret == 0, "module path must exist");
!   if (os::stat(path, &st) != 0) {
+     tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
+       errno, os::errno_name(errno), path);
+     vm_exit_during_initialization();
+   }
    // File or directory found
    ClassPathEntry* new_entry = NULL;
    new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
                                        false /*is_boot_append */, CHECK);
    if (new_entry == NULL) {