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Gregory P. Smith ac8b5b6890
gh-143650: Fix importlib race condition on import failure (GH-143651) 
Fix a race condition where a thread could receive a partially-initialized
module when another thread's import fails. The race occurs when:

1. Thread 1 starts importing, adds module to sys.modules
2. Thread 2 sees the module in sys.modules via the fast path
3. Thread 1's import fails, removes module from sys.modules
4. Thread 2 returns a stale module reference not in sys.modules

The fix adds verification after the "skip lock" optimization in both Python
and C code paths to check if the module is still in sys.modules. If the
module was removed (due to import failure), we retry the import so the
caller receives the actual exception from the import failure rather than
a stale module reference.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-10 14:08:33 +01:00
..
clinic gh-135801: Add the module parameter to compile() etc (GH-139652) 2025-11-13 13:21:32 +02:00
frozen_modules gh-97669: Create Tools/build/ directory (#97963) 2022-10-17 12:01:00 +02:00
_contextvars.c gh-128384: Use a context variable for warnings.catch_warnings (gh-130010) 2025-04-09 16:18:54 -07:00
_warnings.c gh-135801: Improve filtering by module in warn_explicit() without module argument (GH-140151) 2025-10-30 15:55:39 +02:00
asdl.c bpo-43244: Remove ast.h, asdl.h, Python-ast.h headers (GH-24933) 2021-03-23 20:47:40 +01:00
asm_trampoline.S gh-136459: Add perf trampoline support for macOS (#136461) 2025-07-22 16:47:24 +01:00
assemble.c gh-87859: Track Code Object Local Kinds For Arguments (gh-132980) 2025-04-29 02:21:47 +00:00
ast.c gh-143055: Implementation of PEP 798 (#143056) 2026-01-30 20:37:52 -08:00
ast_preprocess.c gh-143055: Implementation of PEP 798 (#143056) 2026-01-30 20:37:52 -08:00
ast_unparse.c gh-132661: Disallow Template/str concatenation after PEP 750 spec update (#135996) 2025-07-21 08:44:26 +02:00
bltinmodule.c gh-135801: Add the module parameter to compile() etc (GH-139652) 2025-11-13 13:21:32 +02:00
bootstrap_hash.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
brc.c Fix typos in documentation and comments (#119763) 2024-06-04 10:22:22 +00:00
bytecodes.c gh-144549: Fix tail calling interpreter on Windows for FT (GH-144550) 2026-02-06 19:20:28 +00:00
ceval.c gh-144549: Fix tail calling interpreter on Windows for FT (GH-144550) 2026-02-06 19:20:28 +00:00
ceval.h gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911) 2026-01-16 10:33:29 -08:00
ceval_gil.c GH-142513: Reimplement executor management (GH-142931) 2025-12-18 16:43:44 +00:00
ceval_macros.h gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292) 2026-01-30 12:20:27 -05:00
codecs.c Python/codecs.c: Remove unused forward declaration (#139511) 2025-10-03 13:33:49 +02:00
codegen.c gh-143055: Implementation of PEP 798 (#143056) 2026-01-30 20:37:52 -08:00
compile.c GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
condvar.h gh-104530: Enable native Win32 condition variables by default (GH-104531) 2024-02-02 13:50:51 +00:00
config_common.h gh-76785: Add PyInterpreterConfig Helpers (gh-117170) 2024-04-02 20:35:52 +00:00
context.c gh-116738: make entering of contextvars.Context thread safe (#143074) 2026-01-06 12:24:02 +05:30
critical_section.c gh-144513: Skip critical section locking during stop-the-world (gh-144524) 2026-02-06 15:14:08 +00:00
crossinterp.c gh-143377: fix crashes in _interpreters.capture_exception (#143418) 2026-01-10 12:37:54 +01:00
crossinterp_data_lookup.h gh-135443: Sometimes Fall Back to __main__.__dict__ For Globals (gh-135491) 2025-06-16 17:34:19 -06:00
crossinterp_exceptions.h gh-132775: Clean Up Cross-Interpreter Error Handling (gh-135369) 2025-06-13 16:45:21 -06:00
dtoa.c gh-131238: Add explicit includes to pycore headers (#131257) 2025-03-17 12:32:43 +01:00
dup2.c gh-108765: Python.h no longer includes <unistd.h> (#108783) 2023-09-02 16:50:18 +02:00
dynamic_annotations.c bpo-32241: Add the const qualifire to declarations of umodifiable strings. (#4748) 2017-12-12 13:55:04 +02:00
dynload_hpux.c gh-88402: Add new sysconfig variables on Windows (GH-110049) 2023-10-04 22:50:29 +00:00
dynload_shlib.c gh-131238: Remove more includes from pycore_interp.h (#131480) 2025-03-19 23:01:32 +01:00
dynload_stub.c gh-88402: Add new sysconfig variables on Windows (GH-110049) 2023-10-04 22:50:29 +00:00
dynload_win.c gh-131942: Use the Python-specific Py_DEBUG macro rather than _DEBUG in Windows-related C code (GH-131944) 2025-05-08 15:01:25 +00:00
emscripten_signal.c GH-108614: Unbreak emscripten build (GH-109132) 2023-09-08 17:54:45 +01:00
emscripten_syscalls.c gh-124621: Emscripten: Fix __syscall_ioctl patch (GH-136993) 2025-07-22 15:05:26 +02:00
emscripten_trampoline.c gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (#137470) 2025-09-17 15:33:55 +01:00
emscripten_trampoline_inner.c gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (#137470) 2025-09-17 15:33:55 +01:00
errors.c gh-143547: Fix PyErr_FormatUnraisable() fallback (#143557) 2026-01-09 13:16:22 +01:00
executor_cases.c.h gh-144549: Fix tail calling interpreter on Windows for FT (GH-144550) 2026-02-06 19:20:28 +00:00
fileutils.c gh-42400: Fix buffer overflow in _Py_wrealpath() for very long paths (#141529) 2025-11-18 17:34:58 +01:00
flowgraph.c GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
frame.c gh-144446: Fix some frame object thread-safety issues (gh-144479) 2026-02-06 09:43:36 -05:00
frozen.c GH-89435: os.path should not be a frozen module (#126924) 2024-11-22 18:50:30 +00:00
frozenmain.c Use PyConfig_Get() in frozenmain.c (#137421) 2025-08-06 14:33:28 +02:00
future.c gh-126139: Improve error message location for future statement with unknown feature (#126140) 2024-10-29 23:57:59 +00:00
gc.c gh-141070: Rename PyUnstable_Object_Dump to PyObject_Dump (GH-142848) 2026-01-16 09:19:43 -05:00
gc_free_threading.c gh-144054: no deferred refcount for untracked (gh-144081) 2026-01-20 10:01:09 -08:00
gc_gil.c gh-100240: Use a consistent implementation for freelists (#121934) 2024-07-22 12:08:27 -04:00
generated_cases.c.h gh-144549: Fix tail calling interpreter on Windows for FT (GH-144550) 2026-02-06 19:20:28 +00:00
getargs.c Revert "gh-112068: C API: Add support of nullable arguments in PyArg_Parse (GH-121303)" (#136991) 2025-07-22 16:39:50 +03:00
getcompiler.c gh-141341: Rename COMPILER macro to _Py_COMPILER on Windows (#141342) 2025-11-10 15:50:51 +01:00
getcopyright.c gh-126133: Only use start year in PSF copyright, remove end years (#126236) 2024-11-12 15:59:19 +02:00
getopt.c GH-133336: Remove reserved `-J` flag for Jython (#133444) 2025-05-05 15:09:19 +00:00
getplatform.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
getversion.c gh-119132: Remove "experimental" tag from the CPython free-threading. (gh-135550) 2025-06-16 23:32:52 +09:00
hamt.c gh-142829: Fix use-after-free in Context.__eq__ via re-entrant ContextVar.set (#142905) 2026-01-09 17:57:34 +05:30
hashtable.c gh-111545: Add Py_HashPointer() function (#112096) 2023-12-06 15:09:22 +01:00
import.c gh-143650: Fix importlib race condition on import failure (GH-143651) 2026-02-10 14:08:33 +01:00
importdl.c gh-140011: Delete importdl assertion that prevents importing embedded modules from packages (GH-141605) 2025-11-26 14:12:49 +01:00
index_pool.c gh-91048: Refactor and optimize remote debugging module (#134652) 2025-05-25 20:19:29 +00:00
initconfig.c gh-144319: Fix huge page safety in pymalloc arenas (#144331) 2026-01-30 18:18:56 +00:00
instruction_sequence.c GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
instrumentation.c Remove redundant pycore_optimizer.h includes (#143184) 2025-12-26 11:11:11 +00:00
interpconfig.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
intrinsics.c gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
jit.c GH-126910: add test for manual frame unwinding (#144137) 2026-01-27 13:17:40 +00:00
legacy_tracing.c gh-137400: Fix thread-safety issues when profiling all threads (gh-137518) 2025-08-13 14:15:12 -04:00
lock.c gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292) 2026-01-30 12:20:27 -05:00
marshal.c gh-106287: Do not write objects after an unmarshalling error (GH-132715) 2026-01-14 11:25:46 +00:00
modsupport.c gh-137210: Add a struct, slot & function for checking an extension's ABI (GH-137212) 2025-09-05 16:23:18 +02:00
mysnprintf.c Add a warning message about PyOS_snprintf (#95993) 2022-10-07 11:49:53 -07:00
mystrtoul.c gh-108765: Python.h no longer includes <ctype.h> (#108831) 2023-09-03 18:54:27 +02:00
object_stack.c gh-100240: Use a consistent implementation for freelists (#121934) 2024-07-22 12:08:27 -04:00
opcode_targets.h gh-142982: Specialize CALL_FUNCTION_EX (GH-143391) 2026-01-06 20:34:08 +00:00
optimizer.c GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
optimizer_analysis.c gh-144623: Fix missing output uops in optimizer debug output (GH-144617) 2026-02-09 13:23:02 +00:00
optimizer_bytecodes.c GH-131798: Optimize _GUARD_TOS_SLICE (GH-144470) 2026-02-08 18:08:26 +00:00
optimizer_cases.c.h GH-131798: Optimize _GUARD_TOS_SLICE (GH-144470) 2026-02-08 18:08:26 +00:00
optimizer_symbols.c GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
parking_lot.c gh-137433: Fix deadlock with stop-the-world and daemon threads (gh-137735) 2025-09-16 09:21:58 +01:00
pathconfig.c gh-133644: Remove deprecated Python initialization getter functions (#133661) 2025-05-09 11:39:23 +00:00
perf_jit_trampoline.c gh-144194: Fix mmap failure check in perf_jit_trampoline.c (#143713) 2026-01-28 13:30:17 +00:00
perf_trampoline.c gh-143228: Fix UAF in perf trampoline during finalization (#143233) 2025-12-28 13:50:23 +00:00
preconfig.c GH-133711: Enable UTF-8 mode by default (PEP 686) (#133712) 2025-07-15 10:45:41 +01:00
pyarena.c Chore: Fix typo in pyarena.c (#126527) 2024-11-07 16:37:41 +01:00
pyctype.c Include files missed in r72044. 2009-04-27 20:54:42 +00:00
pyfpe.c bpo-46315: Add ifdef HAVE_ feature checks for WASI compatibility (GH-30507) 2022-01-13 09:46:04 +01:00
pyhash.c gh-111389: replace deprecated occurrences of _PyHASH_* macros (#141236) 2025-11-09 15:14:08 +01:00
pylifecycle.c gh-140824: Fix _Py_DumpExtensionModules() to ignore sub-modules (#144339) 2026-02-04 16:06:35 +01:00
pymath.c bpo-45440: Remove pymath.c fallbacks (GH-28977) 2021-10-15 19:45:34 +02:00
pystate.c gh-144068: fix JIT tracer memory leak when daemon thread exits (GH-144077) 2026-01-24 09:43:01 +00:00
pystats.c GH-135379: Top of stack caching for the JIT. (GH-135465) 2025-12-11 10:32:52 +00:00
pystrcmp.c gh-108767: Replace ctype.h functions with pyctype.h functions (#108772) 2023-09-01 18:36:53 +02:00
pystrhex.c gh-141370: Fix undefined behavior when using Py_ABS() (GH-141548) 2025-12-05 16:24:35 +02:00
pystrtod.c gh-141004: soft-deprecate Py_INFINITY macro (#141033) 2025-11-12 13:44:49 +01:00
Python-ast.c gh-143055: Implementation of PEP 798 (#143056) 2026-01-30 20:37:52 -08:00
Python-tokenize.c gh-111178: Fix function signatures for test_types (#131455) 2025-03-19 13:46:17 +00:00
pythonrun.c gh-141070: Rename PyUnstable_Object_Dump to PyObject_Dump (GH-142848) 2026-01-16 09:19:43 -05:00
pytime.c gh-80620: Support negative timestamps on windows in time.gmtime, time.localtime, and datetime module (#143463) 2026-01-15 10:51:11 +01:00
qsbr.c fix typos in crossinterp.c and qsbr.c (#142612) 2025-12-12 11:48:20 +05:30
README Issue #18093: Factor out the programs that embed the runtime 2014-07-25 21:52:14 +10:00
record_functions.c.h GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
remote_debug.h gh-144563: Fix remote debugging with duplicate libpython mappings from ctypes (#144595) 2026-02-10 10:04:50 +00:00
remote_debugging.c gh-138122: Implement frame caching in RemoteUnwinder to reduce memory reads (#142137) 2025-12-06 22:37:34 +00:00
specialize.c gh-144289: Remove ENABLE_SPECIALIZATION_FT (gh-144290) 2026-01-27 17:52:50 -05:00
stackrefs.c gh-131527: Stackref debug borrow checker (#140599) 2025-11-05 11:12:56 -08:00
stdlib_module_names.h gh-81313: Add the math.integer module (PEP-791) (GH-133909) 2025-10-31 16:13:43 +02:00
structmember.c gh-41779: Allow defining any __slots__ for a class derived from tuple (GH-141763) 2026-01-06 11:36:00 +02:00
suggestions.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
symtable.c gh-77188: Add support for pickling private methods and nested classes (GH-21480) 2026-02-05 19:50:51 +00:00
sysmodule.c gh-144278: Enable overriding sys.implementation's name and cache_tag when building sysmodule.c (GH-144293) 2026-02-10 00:01:17 +00:00
thread.c gh-134745: Use "pymutex" for sys.thread_info on Windows (#141140) 2025-11-06 16:10:39 +01:00
thread_nt.h gh-134745: Change PyThread_allocate_lock() implementation to PyMutex (#134747) 2025-05-30 10:15:47 +00:00
thread_pthread.h gh-137884: Added threading.get_native_id() on Illumos/Solaris (GH-137927) 2025-08-20 17:10:44 +00:00
thread_pthread_stubs.h gh-125161: return non zero value in pthread_self on wasi (#125303) 2024-10-13 20:59:41 +05:30
tier2_engine.md Docs: fix spelling of the word 'transferring' (#116641) 2024-03-13 23:53:32 +01:00
traceback.c gh-143108: Don't instrument some faulthandler related functions for TSan (#143450) 2026-01-05 22:13:29 +01:00
tracemalloc.c gh-143057: avoid locking in tracemalloc C-APIs when it is not enabled (#143065) 2025-12-22 21:08:07 +05:30
uniqueid.c gh-128923: Use zero to indicate unassigned unique id (#128925) 2025-01-17 16:42:27 +01:00
vm-state.md gh-133079: Remove Py_C_RECURSION_LIMIT & PyThreadState.c_recursion_remaining (GH-133080) 2025-04-29 12:56:20 +02:00

README 

Miscellaneous source files for the main Python shared library