diff -r 96e35aced4ef -r 6b194cfc1557 hotspot/src/os/windows/vm/os_windows.cpp
--- a/hotspot/src/os/windows/vm/os_windows.cpp	Wed May 11 00:40:59 2016 +0000
+++ b/hotspot/src/os/windows/vm/os_windows.cpp	Wed May 11 01:02:28 2016 -0400
@@ -409,8 +409,8 @@
 
 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
 
-// Thread start routine for all new Java threads
-static unsigned __stdcall java_start(Thread* thread) {
+// Thread start routine for all newly created threads
+static unsigned __stdcall thread_native_entry(Thread* thread) {
   // Try to randomize the cache line index of hot stack frames.
   // This helps when threads of the same stack traces evict each other's
   // cache lines. The threads can be either from the same JVM instance, or
@@ -459,6 +459,15 @@
     Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
   }
 
+  // If a thread has not deleted itself ("delete this") as part of its
+  // termination sequence, we have to ensure thread-local-storage is
+  // cleared before we actually terminate. No threads should ever be
+  // deleted asynchronously with respect to their termination.
+  if (Thread::current_or_null_safe() != NULL) {
+    assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
+    thread->clear_thread_current();
+  }
+
   // Thread must not return from exit_process_or_thread(), but if it does,
   // let it proceed to exit normally
   return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
@@ -631,7 +640,7 @@
   HANDLE thread_handle =
     (HANDLE)_beginthreadex(NULL,
                            (unsigned)stack_size,
-                           (unsigned (__stdcall *)(void*)) java_start,
+                           (unsigned (__stdcall *)(void*)) thread_native_entry,
                            thread,
                            initflag,
                            &thread_id);
@@ -670,6 +679,12 @@
 // Free Win32 resources related to the OSThread
 void os::free_thread(OSThread* osthread) {
   assert(osthread != NULL, "osthread not set");
+
+  // We are told to free resources of the argument thread,
+  // but we can only really operate on the current thread.
+  assert(Thread::current()->osthread() == osthread,
+         "os::free_thread but not current thread");
+
   CloseHandle(osthread->thread_handle());
   CloseHandle(osthread->interrupt_event());
   delete osthread;