diff -r 1256c8d923e8 -r e0fd97beab7e src/hotspot/share/memory/metaspaceShared.cpp
--- a/src/hotspot/share/memory/metaspaceShared.cpp	Fri Nov 09 12:08:53 2018 +0800
+++ b/src/hotspot/share/memory/metaspaceShared.cpp	Thu Nov 01 10:59:05 2018 -0700
@@ -1207,10 +1207,6 @@
 
 public:
   static void copy_and_compact() {
-    // We should no longer allocate anything from the metaspace, so that
-    // we can have a stable set of MetaspaceObjs to work with.
-    Metaspace::freeze();
-
     ResourceMark rm;
     SortedSymbolClosure the_ssc; // StackObj
     _ssc = &the_ssc;
@@ -1356,6 +1352,14 @@
 }
 
 void VM_PopulateDumpSharedSpace::doit() {
+  // We should no longer allocate anything from the metaspace, so that:
+  //
+  // (1) Metaspace::allocate might trigger GC if we have run out of
+  //     committed metaspace, but we can't GC because we're running
+  //     in the VM thread.
+  // (2) ArchiveCompactor needs to work with a stable set of MetaspaceObjs.
+  Metaspace::freeze();
+
   Thread* THREAD = VMThread::vm_thread();
 
   FileMapInfo::check_nonempty_dir_in_shared_path_table();
@@ -1420,8 +1424,6 @@
   // any dictionaries.
   NOT_PRODUCT(assert_no_unsafe_anonymous_classes_in_dictionaries());
 
-  SystemDictionaryShared::finalize_verification_constraints();
-
   ArchiveCompactor::initialize();
   ArchiveCompactor::copy_and_compact();
 
@@ -1717,6 +1719,8 @@
 
     SystemDictionary::clear_invoke_method_table();
 
+    SystemDictionaryShared::finalize_verification_constraints();
+
     VM_PopulateDumpSharedSpace op;
     VMThread::execute(&op);
   }