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bytes.join()/bytearray.join() crash (use-after-free) when an item's __buffer__ mutates the joined sequence

Status: Open.

#151295 In python/cpython;

· tonghuaroot opened on Jun 11, 2026

_remote_debugging: binary format only total_samples:u32

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

Status: Open.

#151292 In python/cpython;

· maurycy opened on Jun 11, 2026

Optimize int add/sub for wide exact ints

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151289 In python/cpython;

· KRRT7 opened on Jun 10, 2026

Fix test_capi on UBSan

testsTests in the Lib/test dirTests in the Lib/test dir

topic-C-API

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

Status: Open.

#151284 In python/cpython;

· vstinner opened on Jun 10, 2026

TSan detects a data race when running test_ssl.test_sni_callback_race() on Free Threading

topic-free-threading

topic-SSL

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

Status: Open.

#151277 In python/cpython;

· vstinner opened on Jun 10, 2026

Debug abort compiling fstring concatenation with broken imports

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

topic-parser

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

Status: Open.

#151238 In python/cpython;

· stestagg opened on Jun 10, 2026

Test fails with PYTHON_JIT_STRESS=1

topic-JIT

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

Status: Open.

#151229 In python/cpython;

· markshannon opened on Jun 10, 2026

Data race between lock-free dict.get (_Py_dict_lookup_threadsafe) and dict.clear

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.

#151228 In python/cpython;

· Naserume opened on Jun 10, 2026

Data race in weakref.getweakrefs() under free-threading

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

topic-free-threading

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

Status: Open.

#151223 In python/cpython;

· Naserume opened on Jun 10, 2026

plistlib raises a confusing TypeError when loading a partial ISO 8601 date

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

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

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

Status: Open.

#151221 In python/cpython;

· JavaZeroo opened on Jun 10, 2026

Data race in sys_set_flag when sys.set_int_max_str_digits() is called concurrently with free-threaded build

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.

#151218 In python/cpython;

· Naserume opened on Jun 10, 2026

Document asyncio debugging tools

3.14bugs and security fixesbugs and security fixes

3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes

3.16new features, bugs and security fixesnew features, bugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-asyncio

Status: Open.

#151213 In python/cpython;

· johnslavik opened on Jun 9, 2026