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Attribute cache silently disabled after 1000 class edit, leading to poor performance
interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usagePerformance or resource usagetype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156339 In python/cpython;asyncio: ProactorEventLoop busy-loops at 100% CPU forever when the self-pipe socketpair reaches EOF
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156333 In python/cpython;Testing Python-3.14.7 on PPC Mac OS X 10.5.6, Leopard, shows problems with blake2* hashes
extension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156331 In python/cpython;asyncio.print_call_graph()includes its own frame in the call stackstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156327 In python/cpython;Url starting with file:\\ no longer works in urllib since 3.14
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156325 In python/cpython;unavoidable spurious "exception in shielded future" logged if exception raised after shield cancelled
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156321 In python/cpython;Tier 2 corrupts frame locals when a sys.monitoring tool is active (3.14)
interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156319 In python/cpython;mailbox.MH.__setitem__()can destroy a message when replacement failsstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156312 In python/cpython;Sharing
PySeqIteracross threads use-after-frees the sequence under free-threadinginterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dumpStatus: Open.#156310 In python/cpython;[placeholder] reserving a number for an upcoming fix
triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.type-securityA security issueA security issueStatus: Open.#156293 In python/cpython;os.sendfileleaks header buffer exports on validation errorsextension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156287 In python/cpython;asyncio: awaiting StreamWriter.wait_closed() in an except block rewrites the in-flight exception's traceback in place (same exception object shared between read futures and the close waiter)
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#156278 In python/cpython;