8362203: assert(state == nullptr || state->get_thread_oop() != nullptr) failed: incomplete state

src/hotspot/share/prims/jvmtiExport.cpp

@@ -675,6 +675,13 @@ void JvmtiExport::post_early_vm_start() {
 void JvmtiExport::post_vm_start() {
   EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
 
+  // The JvmtiThreadState is incomplete if initialized in post_early_vm_start
+  // before classes are initialized. It should be updated now.
+  JavaThread *thread  = JavaThread::current();
+  if (thread->jvmti_thread_state() != nullptr) {
+    thread->jvmti_thread_state()->update_thread_oop_during_vm_start();
+  }
+
   // can now enable some events
   JvmtiEventController::vm_start();
 
@@ -684,7 +691,6 @@ void JvmtiExport::post_vm_start() {
     if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
       EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
 
-      JavaThread *thread  = JavaThread::current();
       JvmtiThreadEventMark jem(thread);
       JvmtiJavaThreadEventTransition jet(thread);
       jvmtiEventVMStart callback = env->callbacks()->VMStart;

src/hotspot/share/prims/jvmtiThreadState.cpp

@@ -1041,6 +1041,13 @@ oop JvmtiThreadState::get_thread_oop() {
   return _thread_oop_h.resolve();
 }
 
+void JvmtiThreadState::update_thread_oop_during_vm_start() {
+  assert(_thread->threadObj() != nullptr, "santity check");
+  if (get_thread_oop() == nullptr) {
+    _thread_oop_h.replace(_thread->threadObj());
+  }
+}
+
 void JvmtiThreadState::set_thread(JavaThread* thread) {
   _thread_saved = nullptr;  // Common case.
   if (!_is_virtual && thread == nullptr) {

src/hotspot/share/prims/jvmtiThreadState.hpp

@@ -312,6 +312,8 @@ class JvmtiThreadState : public CHeapObj<mtInternal> {
   void set_thread(JavaThread* thread);
   oop get_thread_oop();
 
+  void update_thread_oop_during_vm_start();
+
   inline bool is_virtual() { return _is_virtual; } // the _thread is virtual
 
   inline bool is_exception_detected()  { return _exception_state == ES_DETECTED;  }

test/hotspot/jtreg/serviceability/jvmti/StartPhase/AllowedFunctions/AllowedFunctions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2025, 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
@@ -23,12 +23,13 @@
 
 /**
  * @test
- * @bug 8172970
+ * @bug 8172970 8362203
  * @summary Verify the functions that are allowed to operate in the start phase
  * with and without can_generate_early_vmstart capability.
  * @requires vm.jvmti
  * @run main/othervm/native -agentlib:AllowedFunctions AllowedFunctions
  * @run main/othervm/native -agentlib:AllowedFunctions=with_early_vmstart AllowedFunctions
+ * @run main/othervm/native -agentlib:AllowedFunctions=with_early_vmstart -Xrunjdwp:transport=dt_socket,address=0,server=y,suspend=n AllowedFunctions
  */
 
 public class AllowedFunctions {