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Miss Islington (bot) 7d074702eb
[3.14] gh-143650: Fix importlib race condition on import failure (GH-143651) (#144662) 
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.
(cherry picked from commit ac8b5b6890)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-11 06:06:51 +00:00
..
clinic [3.14] gh-139748: fix leaks in AC error paths when using unicode FS-b… (#139789) 2025-10-08 22:16:21 +05:30
frozen_modules
_contextvars.c gh-128384: Use a context variable for warnings.catch_warnings (gh-130010) 2025-04-09 16:18:54 -07:00
_warnings.c [3.14] gh-139640: Fix swallowing syntax warnings in different modules (GH-139755) (GH-140117) 2025-10-14 15:56:01 +00:00
asdl.c
asm_trampoline.S [3.14] gh-136541: Fix several problems of perf trampolines in x86_64 and aarch64 (GH-136500) (#136544) 2025-07-11 14:06:19 +00:00
assemble.c gh-87859: Track Code Object Local Kinds For Arguments (gh-132980) 2025-04-29 02:21:47 +00:00
ast.c gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
ast_preprocess.c [3.14] gh-131927: Do not emit PEP 765 warnings in ast.parse() (GH-139642) (GH-140786) 2025-10-30 11:25:34 +00:00
ast_unparse.c [3.14] gh-132661: Disallow Template/str concatenation after PEP 750 spec update (#135996) (#136901) 2025-07-21 17:34:54 +02:00
bltinmodule.c [3.14] gh-140517: fix leak in map_next in strict mode (GH-140543) (#140554) 2025-10-24 22:00:36 +05:30
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 [3.14] gh-144012: Check null binary op extend (GH-144014) (GH-144038) 2026-01-20 18:05:56 +00:00
ceval.c [3.14] GH-100964: Fix reference cycle in exhausted generator frames (GH-141112) (#142902) 2025-12-17 19:48:18 +00:00
ceval_gil.c [3.14] GH-133136: Revise QSBR to reduce excess memory held (gh-135473) (#135912) 2025-07-08 10:58:01 -07:00
ceval_macros.h [3.14] gh-140104: Set next_instr properly in the JIT during exceptions (GH-140233) (GH-141495) 2025-11-13 18:47:25 +00:00
codecs.c [3.14] gh-58124: Avoid CP_UTF8 in UnicodeDecodeError (GH-137415) (#137460) 2025-10-07 19:39:31 +02:00
codegen.c [3.14] gh-138349: Fix crash when combining module-level annotation and listcomp (#138363) (#138749) 2025-09-11 08:43:57 +03:00
compile.c [3.14] Fix dunder name typo in compiler code comment (GH-143374) (#143386) 2026-01-10 12:21:09 +05:30
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 [3.14] gh-142873: Do not check for PyContextVar_CheckExact twice in PyContextVar_Set (GH-142874) (#142893) 2025-12-17 18:28:37 +00:00
critical_section.c [3.14] gh-114203: skip locking if object is already locked by two-mutex critical section (GH-141476) (#141564) 2025-11-14 18:38:30 +00:00
crossinterp.c [3.14] gh-143377: fix crashes in _interpreters.capture_exception (GH-143418) (#143652) 2026-01-10 12:05:42 +00:00
crossinterp_data_lookup.h [3.14] gh-135443: Sometimes Fall Back to __main__.__dict__ For Globals (gh-135593) 2025-06-16 23:59:30 +00:00
crossinterp_exceptions.h [3.14] gh-132775: Clean Up Cross-Interpreter Error Handling (gh-135492) 2025-06-14 02:08:25 +00:00
dtoa.c gh-131238: Add explicit includes to pycore headers (#131257) 2025-03-17 12:32:43 +01:00
dup2.c
dynamic_annotations.c
dynload_hpux.c
dynload_shlib.c gh-131238: Remove more includes from pycore_interp.h (#131480) 2025-03-19 23:01:32 +01:00
dynload_stub.c
dynload_win.c gh-131238: Remove pycore_runtime.h from pycore_pystate.h (#131356) 2025-03-19 17:33:24 +01:00
emscripten_signal.c
emscripten_syscalls.c [3.14] gh-124621: Emscripten: Support pyrepl in browser (GH-136931) (GH-136988) 2025-07-22 15:04:11 +02:00
emscripten_trampoline.c [3.14] gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (GH-137470) (#139039) 2025-09-17 17:21:01 +01:00
emscripten_trampoline_inner.c [3.14] gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (GH-137470) (#139039) 2025-09-17 17:21:01 +01:00
errors.c [3.14] gh-143547: Fix PyErr_FormatUnraisable() fallback (#143557) (#143603) 2026-01-09 16:10:50 +01:00
executor_cases.c.h [3.14] gh-144012: Check null binary op extend (GH-144014) (GH-144038) 2026-01-20 18:05:56 +00:00
fileutils.c gh-124476: Fix decoding from the locale encoding in the C.UTF-8 locale (GH-132477) 2025-04-14 21:32:41 +03:00
flowgraph.c [3.14] gh-137288: Fix bug where boolean expressions are not associated with the correct exception handler (GH-137310). (#137427) 2025-08-12 12:56:37 +03:00
formatter_unicode.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
frame.c [3.14] gh-144446: Fix some frame object thread-safety issues (gh-144479) (#144546) 2026-02-06 15:25:36 +00:00
frozen.c GH-89435: os.path should not be a frozen module (#126924) 2024-11-22 18:50:30 +00:00
frozenmain.c gh-105716: Fix _PyInterpreterState_IsRunningMain() For Embedders (gh-117140) 2024-03-21 18:20:20 -06:00
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 [3.14] Revert "GH-91636: Clear weakrefs created by finalizers. (GH-136401) (#141993)" (#142152) 2025-12-01 20:34:37 +02:00
gc_free_threading.c [3.14] gh-142975: During GC, mark frozen objects with a merged zero refcount for destruction (GH-143156) (GH-143175) 2025-12-25 12:00:42 -05:00
gc_gil.c gh-100240: Use a consistent implementation for freelists (#121934) 2024-07-22 12:08:27 -04:00
generated_cases.c.h [3.14] gh-144012: Check null binary op extend (GH-144014) (GH-144038) 2026-01-20 18:05:56 +00:00
getargs.c [3.14] Revert "gh-112068: C API: Add support of nullable arguments in PyArg_Parse (GH-121303)" (GH-136991) (#137006) 2025-07-22 19:16:31 +03:00
getcompiler.c
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
getversion.c [3.14] gh-119132: Remove "experimental" tag from the CPython free-threading. (gh-135550) (gh-135565) 2025-06-16 14:58:14 +00:00
hamt.c [3.14] gh-142829: Fix use-after-free in Context.__eq__ via re-entrant ContextVar.set (GH-142905) (#143627) 2026-01-10 12:21:37 +05:30
hashtable.c
import.c [3.14] gh-143650: Fix importlib race condition on import failure (GH-143651) (#144662) 2026-02-11 06:06:51 +00:00
importdl.c [3.14] gh-140011: Delete importdl assertion that prevents importing embedded modules from packages (GH-141605) (#141986) 2025-11-28 23:30:57 -08:00
index_pool.c [3.14] gh-91048: Refactor and optimize remote debugging module (#134652) (#134673) 2025-05-25 22:10:20 +00:00
initconfig.c [3.14] gh-143135: Fix sys.flags.inspect when PYTHONINSPECT=0 (GH-143136) (GH-143153) 2025-12-24 18:23:41 +00:00
instruction_sequence.c GH-124715: Move trashcan mechanism into Py_Dealloc (GH-132280) 2025-04-30 11:37:53 +01:00
instrumentation.c [3.14] gh-120158: Fix inconsistent monitoring state when setting events too frequently (gh-141845) (gh-141879) 2025-11-23 15:31:56 +00:00
interpconfig.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
intrinsics.c Get rid of ERROR_IF's "label" parameter (GH-132654) 2025-04-29 17:21:53 -07:00
jit.c [3.14] GH-134291: Support older macOS deployment targets for JIT builds (GH-137211) (#137701) 2025-08-13 13:37:01 +03:00
legacy_tracing.c [3.14] gh-137400: Fix thread-safety issues when profiling all threads (gh-137518) (gh-137730) 2025-10-07 13:45:23 -04:00
lock.c [3.14] gh-134009: Expose PyMutex_IsLocked in the public C API (gh-134365) (#136971) 2025-07-22 12:48:08 +03:00
marshal.c [3.14] gh-106287: Do not write objects after an unmarshalling error (GH-132715) (GH-143832) 2026-01-14 11:52:20 +00:00
modsupport.c gh-132909: handle overflow for 'K' format in do_mkvalue (#132911) 2025-04-25 11:02:57 +00:00
mysnprintf.c
mystrtoul.c
object_stack.c gh-100240: Use a consistent implementation for freelists (#121934) 2024-07-22 12:08:27 -04:00
opcode_targets.h gh-100239: specialize BINARY_OP/SUBSCR for list-slice (#132626) 2025-05-01 10:28:52 +00:00
optimizer.c [3.14] gh-137007: Track executor before any possible deallocations (GH-137016) (GH-142541) 2025-12-10 22:54:28 +00:00
optimizer_analysis.c [3.14] gh-137728 gh-137762: Fix bugs in the JIT with many local variables (GH-137764) (#137999) 2025-08-21 17:00:05 +03:00
optimizer_bytecodes.c [3.14] gh-135608: Add a null check for attribute promotion to fix a JIT crash (GH-135613) (#135739) 2025-06-20 15:24:25 +08:00
optimizer_cases.c.h [3.14] gh-135608: Add a null check for attribute promotion to fix a JIT crash (GH-135613) (#135739) 2025-06-20 15:24:25 +08:00
optimizer_symbols.c [3.14] gh-137728 gh-137762: Fix bugs in the JIT with many local variables (GH-137764) (#137999) 2025-08-21 17:00:05 +03:00
parking_lot.c [3.14] gh-137433: Fix deadlock with stop-the-world and daemon threads (gh-137735) (GH-138965) 2025-10-07 20:46:52 +02:00
pathconfig.c gh-111924: Fix data races when swapping allocators (gh-130287) 2025-02-20 11:31:15 -05:00
perf_jit_trampoline.c [3.14] gh-144194: Fix mmap failure check in perf_jit_trampoline.c (GH-143713) (#144301) 2026-01-28 13:57:19 +00:00
perf_trampoline.c [3.14] gh-143228: Fix UAF in perf trampoline during finalization (GH-143233) (#143247) 2025-12-28 14:32:11 +00:00
preconfig.c
pyarena.c Chore: Fix typo in pyarena.c (#126527) 2024-11-07 16:37:41 +01:00
pyctype.c
pyfpe.c
pyhash.c gh-122854: Add Py_HashBuffer() function (#122855) 2024-08-30 15:42:27 +00:00
pylifecycle.c [3.14] gh-144307: Fix a reference leak during module teardown (GH-144308) (GH-144327) 2026-01-29 19:19:14 +00:00
pymath.c
pystate.c [3.14] gh-142048: Fix lost gc allocations count on thread cleanup (GH-142233) (#142504) 2025-12-10 10:52:55 +00:00
pystrcmp.c
pystrhex.c [3.14] gh-141370: Fix undefined behavior when using Py_ABS() (GH-141548) (GH-142301) 2025-12-12 15:11:43 +00:00
pystrtod.c gh-120026: soft deprecate Py_HUGE_VAL macro (#120027) 2024-11-01 22:04:31 +00:00
Python-ast.c [3.14] gh-144169: Fix three crashes in AST objects with non-str kwargs (GH-144178) (#144227) 2026-01-26 12:14:39 +00:00
Python-tokenize.c gh-111178: Fix function signatures for test_types (#131455) 2025-03-19 13:46:17 +00:00
pythonrun.c [3.14] gh-137576: Fix for Basic REPL showing incorrect code in tracebacks with PYTHONSTARTUP (GH-137625) (#137771) 2025-08-27 18:28:20 +03:00
pytime.c gh-131238: Remove pycore_runtime.h from pycore_pystate.h (#131356) 2025-03-19 17:33:24 +01:00
qsbr.c [3.14] GH-133136: Revise QSBR to reduce excess memory held (gh-135473) (#135912) 2025-07-08 10:58:01 -07:00
README
remote_debug.h [3.14] gh-144563: Fix remote debugging with duplicate libpython mappings from ctypes (GH-144595) (#144655) 2026-02-10 14:31:49 +00:00
remote_debugging.c [3.14] Fix compiler warnings in remote debugging (#141060) (#141067) 2025-11-05 19:49:39 +00:00
specialize.c [3.14] gh-139525: Don't specialize functions which have a modified vectorcall (GH-139524) (#139709) 2025-10-08 09:13:34 -07:00
stackrefs.c [3.14] gh-133590: ensure that TableEntry.linenumber_borrow is initialized (GH-133681) (#133872) 2025-05-11 08:44:22 +00:00
stdlib_module_names.h GH-91048: Minor fixes for `_remotedebugging & rename to _remote_debugging` (#133398) 2025-05-05 02:30:14 +02:00
structmember.c gh-132685: fix thread safety of PyMember_GetOne with _Py_T_OBJECT (#132690) 2025-04-18 21:03:42 +05:30
suggestions.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
symtable.c gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
sysmodule.c [3.14] gh-142571: Check for errors before calling each syscall in PyUnstable_CopyPerfMapFile() (GH-142460) (#142600) 2025-12-11 22:13:36 +00:00
thread.c gh-131238: Add explicit includes to pycore headers (#131257) 2025-03-17 12:32:43 +01:00
thread_nt.h GH-131296: Add missing UNREACHABLE mark in thread_nt.h (GH-131589) 2025-03-31 20:28:35 +01:00
thread_pthread.h gh-130115: fix thread identifiers for 32-bit musl (#130391) 2025-04-04 16:31:37 +02:00
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 [3.14] gh-142737: Handle lost io.open in _Py_FindSourceFile (GH-142747) (GH-142773) 2025-12-15 23:30:00 +00:00
tracemalloc.c [3.14] gh-143057: avoid locking in tracemalloc C-APIs when it is not enabled (GH-143065) (#143071) 2025-12-22 16:04:24 +00:00
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