#🔒 Multiprocessing Permission Error `PermissionError: [WinError 5] Access is denied`

9 messages · Page 1 of 1 (latest)

real pagoda
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I'm working on a program with multiple parts that are critical to be running in parallel so I was trying out multiprocessing and I get this error in my IDE and Command Prompt with administrator privileges

  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\multiprocessing\context.py", line 336, in _Popen
    return Popen(process_obj)
           ^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\multiprocessing\popen_spawn_win32.py", line 95, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle 'weakref.ReferenceType' object

C:\Users\hgdxg\Downloads\code\practice>Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\multiprocessing\spawn.py", line 113, in spawn_main
    new_handle = reduction.duplicate(pipe_handle,
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.2544.0_x64__qbz5n2kfra8p0\Lib\multiprocessing\reduction.py", line 79, in duplicate
    return _winapi.DuplicateHandle(
           ^^^^^^^^^^^^^^^^^^^^^^^^
PermissionError: [WinError 5] Access is denied```
charred needleBOT
#

@real pagoda

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real pagoda
#

looks like it occurs after i try to start my other processes

real pagoda
real pagoda
#

I narrowed it down to the multiprocessing.Manager()

#

windows doesnt like it :/

charred needleBOT
#

@real pagoda

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