From f5249db9c566f87f7fc4f3ed70114a8168babd8b Mon Sep 17 00:00:00 2001
From: Serguei Spitsyn <sspitsyn@openjdk.org>
Date: Tue, 23 Dec 2025 22:21:58 +0000
Subject: [PATCH] 8374233: Overloaded constructor MountUnmountDisabler(jthread
 thread) is missed

Reviewed-by: cjplummer, amenkov
---
 src/hotspot/share/runtime/mountUnmountDisabler.cpp | 8 ++++++++
 src/hotspot/share/runtime/mountUnmountDisabler.hpp | 1 +
 2 files changed, 9 insertions(+)

diff --git a/src/hotspot/share/runtime/mountUnmountDisabler.cpp b/src/hotspot/share/runtime/mountUnmountDisabler.cpp
index 261bbfb9c18..8635eeb2dcc 100644
--- a/src/hotspot/share/runtime/mountUnmountDisabler.cpp
+++ b/src/hotspot/share/runtime/mountUnmountDisabler.cpp
@@ -28,6 +28,7 @@
 #include "prims/jvmtiThreadState.inline.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/javaThread.hpp"
+#include "runtime/jniHandles.hpp"
 #include "runtime/mountUnmountDisabler.hpp"
 #include "runtime/threadSMR.hpp"
 
@@ -193,6 +194,13 @@ void MountUnmountDisabler::end_transition(JavaThread* current, oop vthread, bool
   }
 }
 
+// disable transitions for one virtual thread
+// disable transitions for all threads if thread is nullptr or a platform thread
+MountUnmountDisabler::MountUnmountDisabler(jthread thread)
+  : MountUnmountDisabler(JNIHandles::resolve_external_guard(thread))
+{
+}
+
 // disable transitions for one virtual thread
 // disable transitions for all threads if thread is nullptr or a platform thread
 MountUnmountDisabler::MountUnmountDisabler(oop thread_oop)
diff --git a/src/hotspot/share/runtime/mountUnmountDisabler.hpp b/src/hotspot/share/runtime/mountUnmountDisabler.hpp
index 2ebb09734a6..4c9b6124b46 100644
--- a/src/hotspot/share/runtime/mountUnmountDisabler.hpp
+++ b/src/hotspot/share/runtime/mountUnmountDisabler.hpp
@@ -58,6 +58,7 @@ class MountUnmountDisabler : public AnyObj {
  public:
   MountUnmountDisabler(bool exlusive = false);
   MountUnmountDisabler(oop thread_oop);
+  MountUnmountDisabler(jthread thread);
   ~MountUnmountDisabler();
 
   static int global_vthread_transition_disable_count();