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slot.__delete__() behaves as non-atomic in free-threading

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

topic-free-threading

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

Status: Open.

#146270 In python/cpython;

· x42005e1f opened on Mar 22, 2026

gh-146219: Document reusing a thread state across repeated foreign-thread calls

awaiting core review

docsDocumentation in the Doc dirDocumentation in the Doc dir

performancePerformance or resource usagePerformance or resource usage

skip news

topic-free-threading

Status: Open (in progress).

python/cpythonnumber 146221

#146221 In python/cpython;

· gpshead opened on Mar 20, 2026

Repeated Python Thread State creation and destruction for foreign threads is slow

docsDocumentation in the Doc dirDocumentation in the Doc dir

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146219 In python/cpython;

· gpshead opened on Mar 20, 2026

gh-146041: Avoid lock in sys.intern() for already interned strings

awaiting merge

topic-free-threading

Status: Open (in progress).

python/cpythonnumber 146072

#146072 In python/cpython;

· colesbury opened on Mar 17, 2026

Free threading scaling bottleneck in sys.intern()

3.14bugs and security fixesbugs and security fixes

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

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

Status: Open.

#146041 In python/cpython;

· colesbury opened on Mar 16, 2026

gh-123471: Make itertools.zip_longest safe in the FT build

awaiting merge

topic-free-threading

Status: Open (in progress).

python/cpythonnumber 146033

#146033 In python/cpython;

· eendebakpt opened on Mar 16, 2026

Make xml.etree.ElementTree.Element usable on free-threaded builds

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-free-threading

topic-XML

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146022 In python/cpython;

· sampsonc opened on Mar 16, 2026

gh-123471: Make itertools.dropwhile and itertools.takewhile safe in the FT build

awaiting review

topic-free-threading

Status: Open (in progress).

python/cpythonnumber 146021

#146021 In python/cpython;

· eendebakpt opened on Mar 16, 2026

hmac_digest race condition with openssl 3.0.19 and Python 3.14t

extension-modulesC modules in the Modules dirC modules in the Modules dir

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

topic-free-threading

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#145933 In python/cpython;

· lunixbochs opened on Mar 14, 2026

Tracking issue for free-threading docs

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-free-threading

Status: Open.

#145912 In python/cpython;

· lysnikolaou opened on Mar 13, 2026

gh-142518: Annotate PyDict_* C APIs for thread safety

awaiting core review

needs backport to 3.14bugs and security fixesbugs and security fixes

skip news

topic-free-threading

Status: Open (in progress).

python/cpythonnumber 145875

#145875 In python/cpython;

· lysnikolaou opened on Mar 12, 2026

Unexpected scaling bottleneck in _PyType_Lookup / _PyType_LookupStackRefAndVersion

3.14bugs and security fixesbugs and security fixes

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

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

Status: Open.

#145685 In python/cpython;

· colesbury opened on Mar 9, 2026