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ProcessPoolExecutor raises exception or hangs the process whenshutdown(wait=False) and worker throws exception #132969

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3.13bugs and security fixes3.14bugs and security fixes3.15new features, bugs and security fixesdeferred-blockerstdlibPython modules in the Lib dirtopic-multiprocessingtype-bugAn unexpected behavior, bug, or error
@ogbiggles

Description

@ogbiggles

Bug report

Bug description:

Below code demonstrates two problems that occur when
(a) worker process throws an exception, and
(b)shutdown(wait=False) is used

  1. When max_workers < number of submitted tasks, raisesexception TypeError: object of type 'NoneType' has no len()
  2. When max_workers > number of submitted tasks, raisesexception TypeError: object of type 'NoneType' has no len() AND then program hangs

There is no problem whenshutdown(wait=True) is used or if the worker processes exit cleanly.

importconcurrent.futuresimportmultiprocessingasmpimporttimedeftask(n:int)->int:ifn==2:raiseException("Not gonna do it")else:time.sleep(n)returnndefmain()->None:# max_workers=2 results in raised exception and program exits# max_workers=4 results in raised exception and program hangs#executor=concurrent.futures.ProcessPoolExecutor(max_workers=2,mp_context=mp.get_context("forkserver"),max_tasks_per_child=1    )f1=executor.submit(task,1)f2=executor.submit(task,2)f3=executor.submit(task,3)result=0try:result+=f1.result()result+=f2.result()result+=f3.result()print(f"Result ={result}")exceptExceptionase:print(f"Exception while getting result :{e}")executor.shutdown(wait=False)if__name__=="__main__":main()

CPython versions tested on:

3.12

Operating systems tested on:

Linux, macOS

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    3.13bugs and security fixes3.14bugs and security fixes3.15new features, bugs and security fixesdeferred-blockerstdlibPython modules in the Lib dirtopic-multiprocessingtype-bugAn unexpected behavior, bug, or error

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