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8273505: runtime/cds/appcds/loaderConstraints/ crashed with SIGSEGV in MetaspaceShared::link_shared_classes #5566

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@@ -584,18 +584,19 @@ void VM_PopulateDumpSharedSpace::doit() {

class CollectCLDClosure : public CLDClosure {
GrowableArray<ClassLoaderData*> _loaded_cld;
GrowableArray<Handle> _loaded_cld_handles; // keep the CLDs alive
Thread* _current_thread;
CollectCLDClosure() {}
CollectCLDClosure(Thread* thread) : _current_thread(thread) {}
~CollectCLDClosure() {
for (int i = 0; i < _loaded_cld.length(); i++) {
ClassLoaderData* cld =;
void do_cld(ClassLoaderData* cld) {
if (!cld->is_unloading()) {
_loaded_cld_handles.append(Handle(_current_thread, cld->holder_phantom()));

@@ -641,11 +642,10 @@ bool MetaspaceShared::link_class_for_cds(InstanceKlass* ik, TRAPS) {

void MetaspaceShared::link_shared_classes(TRAPS) {
// Collect all loaded ClassLoaderData.
ResourceMark rm;

CollectCLDClosure collect_cld;

// Collect all loaded ClassLoaderData.
CollectCLDClosure collect_cld(THREAD);
// ClassLoaderDataGraph::loaded_cld_do requires ClassLoaderDataGraph_lock.
// We cannot link the classes while holding this lock (or else we may run into deadlock).
@@ -302,9 +302,7 @@ bool ClassLoaderData::try_claim(int claim) {
// it is being defined, therefore _keep_alive is not volatile or atomic.
void ClassLoaderData::inc_keep_alive() {
if (has_class_mirror_holder()) {
if (!Arguments::is_dumping_archive()) {
assert(_keep_alive > 0, "Invalid keep alive increment count");
assert(_keep_alive > 0, "Invalid keep alive increment count");