diff --git a/Lib/multiprocessing/popen_spawn_win32.py b/Lib/multiprocessing/popen_spawn_win32.py
@@ -18,6 +18,12 @@
WINEXE = (sys.platform == 'win32' and getattr(sys, 'frozen', False))
WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")

#
# We define a Popen class similar to the one from subprocess, but
# whose constructor takes a process object as its argument.
@@ -32,8 +38,12 @@ class Popen(object):
    def __init__(self, process_obj):
        prep_data = spawn.get_preparation_data(process_obj._name)

-        # read end of pipe will be "stolen" by the child process
        # -- see spawn_main() in spawn.py.
        rhandle, whandle = _winapi.CreatePipe(None, 0)
        wfd = msvcrt.open_osfhandle(whandle, 0)
        cmd = spawn.get_command_line(parent_pid=os.getpid(),
@@ -56,7 +66,8 @@ def __init__(self, process_obj):
            self.returncode = None
            self._handle = hp
            self.sentinel = int(hp)
-            self.finalizer = util.Finalize(self, _winapi.CloseHandle, (self.sentinel,))

            # send information to child
            set_spawning_popen(self)

diff --git a/Lib/multiprocessing/reduction.py b/Lib/multiprocessing/reduction.py
@@ -68,12 +68,16 @@ def dump(obj, file, protocol=None):
    __all__ += ['DupHandle', 'duplicate', 'steal_handle']
    import _winapi

-    def duplicate(handle, target_process=None, inheritable=False):
        '''Duplicate a handle.  (target_process is a handle not a pid!)'''
        if target_process is None:
-            target_process = _winapi.GetCurrentProcess()
        return _winapi.DuplicateHandle(
-            _winapi.GetCurrentProcess(), handle, target_process,
            0, inheritable, _winapi.DUPLICATE_SAME_ACCESS)

    def steal_handle(source_pid, handle):

diff --git a/Lib/multiprocessing/spawn.py b/Lib/multiprocessing/spawn.py
@@ -96,7 +96,15 @@ def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):
    assert is_forking(sys.argv), "Not forking"
    if sys.platform == 'win32':
        import msvcrt
-        new_handle = reduction.steal_handle(parent_pid, pipe_handle)
        fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
    else:
        from . import semaphore_tracker

diff --git a/Misc/NEWS.d/next/Library/2018-06-26-02-09-18.bpo-33929.OcCLah.rst b/Misc/NEWS.d/next/Library/2018-06-26-02-09-18.bpo-33929.OcCLah.rst
@@ -0,0 +1,5 @@