diff --git a/src/hotspot/os/aix/osThread_aix.cpp b/src/hotspot/os/aix/osThread_aix.cpp
index ab08a766156..c424b044c09 100644
--- a/src/hotspot/os/aix/osThread_aix.cpp
+++ b/src/hotspot/os/aix/osThread_aix.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -32,7 +32,6 @@
 
 OSThread::OSThread()
   : _thread_id(0),
-    _thread_type(),
     _kernel_thread_id(0),
     _caller_sigmask(),
     sr(),
diff --git a/src/hotspot/os/aix/osThread_aix.hpp b/src/hotspot/os/aix/osThread_aix.hpp
index 8f3799d0701..514e554101e 100644
--- a/src/hotspot/os/aix/osThread_aix.hpp
+++ b/src/hotspot/os/aix/osThread_aix.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2013 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -36,7 +36,6 @@ class OSThread : public OSThreadBase {
   typedef pthread_t thread_id_t;
 
   thread_id_t _thread_id;
-  int _thread_type;
 
   // On AIX, we use the pthread id as OSThread::thread_id and keep the kernel thread id
   // separately for diagnostic purposes.
@@ -52,13 +51,6 @@ class OSThread : public OSThreadBase {
   OSThread();
   ~OSThread();
 
-  int thread_type() const {
-    return _thread_type;
-  }
-  void set_thread_type(int type) {
-    _thread_type = type;
-  }
-
   // Methods to save/restore caller's signal mask
   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
diff --git a/src/hotspot/os/aix/os_aix.cpp b/src/hotspot/os/aix/os_aix.cpp
index 5022272d1b4..842ab0c6eeb 100644
--- a/src/hotspot/os/aix/os_aix.cpp
+++ b/src/hotspot/os/aix/os_aix.cpp
@@ -698,9 +698,6 @@ bool os::create_thread(Thread* thread, ThreadType thr_type,
     return false;
   }
 
-  // Set the correct thread state.
-  osthread->set_thread_type(thr_type);
-
   // Initial state is ALLOCATED but not INITIALIZED
   osthread->set_state(ALLOCATED);
 
diff --git a/src/hotspot/os/bsd/osThread_bsd.cpp b/src/hotspot/os/bsd/osThread_bsd.cpp
index 4080ea1bf29..d9624040bc7 100644
--- a/src/hotspot/os/bsd/osThread_bsd.cpp
+++ b/src/hotspot/os/bsd/osThread_bsd.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, 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
@@ -37,7 +37,6 @@ OSThread::OSThread()
         nullptr
 #endif
     ),
-    _thread_type(),
     _pthread_id(nullptr),
     _unique_thread_id(0),
     _caller_sigmask(),
diff --git a/src/hotspot/os/bsd/osThread_bsd.hpp b/src/hotspot/os/bsd/osThread_bsd.hpp
index e54e7195f98..21bec3f3836 100644
--- a/src/hotspot/os/bsd/osThread_bsd.hpp
+++ b/src/hotspot/os/bsd/osThread_bsd.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, 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
@@ -39,7 +39,6 @@ class OSThread : public OSThreadBase {
 #endif
 
   thread_id_t _thread_id;
-  int _thread_type;
 
   // _pthread_id is the pthread id, which is used by library calls
   // (e.g. pthread_kill).
@@ -56,13 +55,6 @@ class OSThread : public OSThreadBase {
   OSThread();
   ~OSThread();
 
-  int thread_type() const {
-    return _thread_type;
-  }
-  void set_thread_type(int type) {
-    _thread_type = type;
-  }
-
   // Methods to save/restore caller's signal mask
   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
diff --git a/src/hotspot/os/bsd/os_bsd.cpp b/src/hotspot/os/bsd/os_bsd.cpp
index 6b3bf060d6f..b50ebf22203 100644
--- a/src/hotspot/os/bsd/os_bsd.cpp
+++ b/src/hotspot/os/bsd/os_bsd.cpp
@@ -633,9 +633,6 @@ bool os::create_thread(Thread* thread, ThreadType thr_type,
     return false;
   }
 
-  // set the correct thread state
-  osthread->set_thread_type(thr_type);
-
   // Initial state is ALLOCATED but not INITIALIZED
   osthread->set_state(ALLOCATED);
 
diff --git a/src/hotspot/os/linux/osThread_linux.cpp b/src/hotspot/os/linux/osThread_linux.cpp
index 3dd6e3bbcd1..c9a44eb413f 100644
--- a/src/hotspot/os/linux/osThread_linux.cpp
+++ b/src/hotspot/os/linux/osThread_linux.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, 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
@@ -31,7 +31,6 @@
 
 OSThread::OSThread()
   : _thread_id(0),
-    _thread_type(),
     _pthread_id(0),
     _caller_sigmask(),
     sr(),
diff --git a/src/hotspot/os/linux/osThread_linux.hpp b/src/hotspot/os/linux/osThread_linux.hpp
index f8dfd5a213b..5ed2d07850a 100644
--- a/src/hotspot/os/linux/osThread_linux.hpp
+++ b/src/hotspot/os/linux/osThread_linux.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, 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
@@ -35,7 +35,6 @@ class OSThread : public OSThreadBase {
   typedef pid_t thread_id_t;
 
   thread_id_t _thread_id;
-  int _thread_type;
 
   // _pthread_id is the pthread id, which is used by library calls
   // (e.g. pthread_kill).
@@ -47,13 +46,6 @@ class OSThread : public OSThreadBase {
   OSThread();
   ~OSThread();
 
-  int thread_type() const {
-    return _thread_type;
-  }
-  void set_thread_type(int type) {
-    _thread_type = type;
-  }
-
   // Methods to save/restore caller's signal mask
   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
diff --git a/src/hotspot/os/linux/os_linux.cpp b/src/hotspot/os/linux/os_linux.cpp
index 514268a7400..b2b9a798119 100644
--- a/src/hotspot/os/linux/os_linux.cpp
+++ b/src/hotspot/os/linux/os_linux.cpp
@@ -974,9 +974,6 @@ bool os::create_thread(Thread* thread, ThreadType thr_type,
     return false;
   }
 
-  // set the correct thread state
-  osthread->set_thread_type(thr_type);
-
   // Initial state is ALLOCATED but not INITIALIZED
   osthread->set_state(ALLOCATED);