8024667: VM crashes with "assert(method() != NULL) failed: must have set method"

Summary: Check if data is in shared spaces before deallocating it.
Reviewed-by: coleenp, dcubed

src/share/vm/memory/metadataFactory.hpp

 /*
- * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -65,6 +65,7 @@ class MetadataFactory : AllStatic {
   static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
     if (data != NULL) {
       assert(loader_data != NULL, "shouldn't pass null");
+      assert(!data->is_shared(), "cannot deallocate array in shared spaces");
       int size = data->size();
       if (DumpSharedSpaces) {
         loader_data->ro_metaspace()->deallocate((MetaWord*)data, size, false);
@@ -83,6 +84,7 @@ class MetadataFactory : AllStatic {
       // Call metadata's deallocate function which will call deallocate fields
       assert(!DumpSharedSpaces, "cannot deallocate metadata when dumping CDS archive");
       assert(!md->on_stack(), "can't deallocate things on stack");
+      assert(!md->is_shared(), "cannot deallocate if in shared spaces");
       md->deallocate_contents(loader_data);
       loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());
     }

src/share/vm/oops/instanceKlass.cpp

@@ -320,7 +320,8 @@ InstanceKlass::InstanceKlass(int vtable_len,
 
 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
                                        Array<Method*>* methods) {
-  if (methods != NULL && methods != Universe::the_empty_method_array()) {
+  if (methods != NULL && methods != Universe::the_empty_method_array() &&
+      !methods->is_shared()) {
     for (int i = 0; i < methods->length(); i++) {
       Method* method = methods->at(i);
       if (method == NULL) continue;  // maybe null if error processing
@@ -344,13 +345,14 @@ void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
     // check that the interfaces don't come from super class
     Array<Klass*>* sti = (super_klass == NULL) ? NULL :
                     InstanceKlass::cast(super_klass)->transitive_interfaces();
-    if (ti != sti) {
+    if (ti != sti && ti != NULL && !ti->is_shared()) {
       MetadataFactory::free_array<Klass*>(loader_data, ti);
     }
   }
 
   // local interfaces can be empty
-  if (local_interfaces != Universe::the_empty_klass_array()) {
+  if (local_interfaces != Universe::the_empty_klass_array() &&
+      local_interfaces != NULL && !local_interfaces->is_shared()) {
     MetadataFactory::free_array<Klass*>(loader_data, local_interfaces);
   }
 }
@@ -380,21 +382,25 @@ void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
   deallocate_methods(loader_data, methods());
   set_methods(NULL);
 
-  if (method_ordering() != Universe::the_empty_int_array()) {
+  if (method_ordering() != NULL &&
+      method_ordering() != Universe::the_empty_int_array() &&
+      !method_ordering()->is_shared()) {
     MetadataFactory::free_array<int>(loader_data, method_ordering());
   }
   set_method_ordering(NULL);
 
   // default methods can be empty
   if (default_methods() != NULL &&
-      default_methods() != Universe::the_empty_method_array()) {
+      default_methods() != Universe::the_empty_method_array() &&
+      !default_methods()->is_shared()) {
     MetadataFactory::free_array<Method*>(loader_data, default_methods());
   }
   // Do NOT deallocate the default methods, they are owned by superinterfaces.
   set_default_methods(NULL);
 
   // default methods vtable indices can be empty
-  if (default_vtable_indices() != NULL) {
+  if (default_vtable_indices() != NULL &&
+      !default_vtable_indices()->is_shared()) {
     MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
   }
   set_default_vtable_indices(NULL);
@@ -403,8 +409,10 @@ void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
   // This array is in Klass, but remove it with the InstanceKlass since
   // this place would be the only caller and it can share memory with transitive
   // interfaces.
-  if (secondary_supers() != Universe::the_empty_klass_array() &&
-      secondary_supers() != transitive_interfaces()) {
+  if (secondary_supers() != NULL &&
+      secondary_supers() != Universe::the_empty_klass_array() &&
+      secondary_supers() != transitive_interfaces() &&
+      !secondary_supers()->is_shared()) {
     MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
   }
   set_secondary_supers(NULL);
@@ -413,24 +421,32 @@ void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
   set_transitive_interfaces(NULL);
   set_local_interfaces(NULL);
 
-  MetadataFactory::free_array<jushort>(loader_data, fields());
+  if (fields() != NULL && !fields()->is_shared()) {
+    MetadataFactory::free_array<jushort>(loader_data, fields());
+  }
   set_fields(NULL, 0);
 
   // If a method from a redefined class is using this constant pool, don't
   // delete it, yet.  The new class's previous version will point to this.
   if (constants() != NULL) {
     assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
-    MetadataFactory::free_metadata(loader_data, constants());
+    if (!constants()->is_shared()) {
+      MetadataFactory::free_metadata(loader_data, constants());
+    }
     set_constants(NULL);
   }
 
-  if (inner_classes() != Universe::the_empty_short_array()) {
+  if (inner_classes() != NULL &&
+      inner_classes() != Universe::the_empty_short_array() &&
+      !inner_classes()->is_shared()) {
     MetadataFactory::free_array<jushort>(loader_data, inner_classes());
   }
   set_inner_classes(NULL);
 
-  // We should deallocate the Annotations instance
-  MetadataFactory::free_metadata(loader_data, annotations());
+  // We should deallocate the Annotations instance if it's not in shared spaces.
+  if (annotations() != NULL && !annotations()->is_shared()) {
+    MetadataFactory::free_metadata(loader_data, annotations());
+  }
   set_annotations(NULL);
 }