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Allow passing creationflags to <code>multiprocessing</code> Process implementations to be used to set process creation flags on Windows

OS-windows

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#140970 In python/cpython;

· danegsta opened on Nov 3, 2025

Memory leak occurs when using multiprocessing with large data objects

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#140885 In python/cpython;

· abhiramch018 opened on Nov 1, 2025

Sample code with multiprocessing freeze_support and set_start_method fails

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-multiprocessing

Status: Open.

#140814 In python/cpython;

· RobH123 opened on Oct 31, 2025

3.15 profiling, can't use ProcessPoolExecutor.map() in a simple script

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

topic-multiprocessing

topic-profiling

topic-subinterpreters

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#140729 In python/cpython;

· dimaqq opened on Oct 28, 2025

multiprocessing.Queue.empty() returns False after all producers have exited on Windows 3.13.3

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#140331 In python/cpython;

· xiao20041001 opened on Oct 19, 2025

<code>multiprocessing.Pool</code> is incompatible with <code>concurrent.interpreters</code>

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

topic-subinterpreters

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#140057 In python/cpython;

· bluetech opened on Oct 13, 2025

Potential performance regression with Python 3.14 bench_mp_pool on Linux

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

performancePerformance or resource usagePerformance or resource usage

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#139881 In python/cpython;

· NoAnyLove opened on Oct 10, 2025

<code>multiprocessing.managers.BaseProxy</code> can not be unpickled when using a custom <code>authkey</code>

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#139801 In python/cpython;

· moi90 opened on Oct 8, 2025

Do not use <code>tempfile.mktemp()</code> for creating named pipes on Windows

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

OS-windows

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-asyncio

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#137335 In python/cpython;

· lighting9999 opened on Aug 3, 2025

<code>ProcessPoolExecutor</code> fails to notify when called with <code>shutdown(cancel_futures=True)</code>

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136655 In python/cpython;

· chrisvanrun opened on Jul 14, 2025

Dropping concurrent.futures.Executor.map result cancels pending futures

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#136578 In python/cpython;

· mirober opened on Jul 12, 2025

Regression in multiprocessing.set_start_method introduced in Python 3.13.4

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#135726 In python/cpython;

· marcelotduarte opened on Jun 19, 2025