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Title: gh-133467: Fix typeobject `tp_base` race in free threading by LindaSummer · Pull Request #140549 · python/cpython · GitHub

Open Graph Title: gh-133467: Fix typeobject `tp_base` race in free threading by LindaSummer · Pull Request #140549 · python/cpython

X Title: gh-133467: Fix typeobject `tp_base` race in free threading by LindaSummer · Pull Request #140549 · python/cpython

Description: Issue #133467 Proposed Changes Fix the race of PyTypeObject::tp_base between typemember __base__ and set of __bases__. Add test case in unit test. Comment Root cause Since the __bases__'s getter and setter are protetcted by TYPE_LOCK. cpython/Objects/typeobject.c Line 1916 in 289360a ASSERT_TYPE_LOCK_HELD(); cpython/Objects/typeobject.c Lines 586 to 596 in 289360a _PyType_GetBases(PyTypeObject *self) { PyObject *res; BEGIN_TYPE_LOCK(); res = lookup_tp_bases(self); Py_INCREF(res); END_TYPE_LOCK(); return res; } So it is safe for concurrency. But the update of bases will re-evaluate the tp_base again and would be in race with the direct access of __base__. cpython/Objects/typeobject.c Line 1459 in 289360a {"__base__", _Py_T_OBJECT, offsetof(PyTypeObject, tp_base), Py_READONLY}, How to fix At the beginning I try to use the TYPE_LOCK to protect the tb_base for __base__ access. But it's a directly memory access by offset and I have no more idea except StopTheWorld. So I add a STW for the updating of tp_base in setter. Please let me know if we have a better way for it. 😊 TSAN output for this race Here is the TSAN core output of this race. WARNING: ThreadSanitizer: data race (pid=1754505) Write of size 8 at 0x7fb1ed269910 by thread T27: #0 type_set_bases_unlocked /home/someuser/project/cpython/Objects/typeobject.c:1924:19 (python+0x6b265a) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #1 type_set_bases /home/someuser/project/cpython/Objects/typeobject.c:2009:15 (python+0x6b265a) #2 getset_set /home/someuser/project/cpython/Objects/descrobject.c:250:16 (python+0x5a8fe6) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #3 type_setattro /home/someuser/project/cpython/Objects/typeobject.c:6532:19 (python+0x6a2ac5) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #4 PyObject_SetAttr /home/someuser/project/cpython/Objects/object.c:1476:15 (python+0x649360) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #5 _PyEval_EvalFrameDefault /home/someuser/project/cpython/Python/generated_cases.c.h:10750:27 (python+0x7bd953) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #6 _PyEval_EvalFrame /home/someuser/project/cpython/./Include/internal/pycore_ceval.h:121:16 (python+0x79c3a0) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #7 _PyEval_Vector /home/someuser/project/cpython/Python/ceval.c:2005:12 (python+0x79c3a0) #8 _PyFunction_Vectorcall /home/someuser/project/cpython/Objects/call.c (python+0x590def) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #9 _PyObject_VectorcallTstate /home/someuser/project/cpython/./Include/internal/pycore_call.h:169:11 (python+0x5956b6) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #10 method_vectorcall /home/someuser/project/cpython/Objects/classobject.c:73:20 (python+0x5956b6) #11 _PyObject_VectorcallTstate /home/someuser/project/cpython/./Include/internal/pycore_call.h:169:11 (python+0x7f4a21) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #12 context_run /home/someuser/project/cpython/Python/context.c:728:29 (python+0x7f4a21) #13 _PyEval_EvalFrameDefault /home/someuser/project/cpython/Python/generated_cases.c.h:3710:35 (python+0x7a9401) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #14 _PyEval_EvalFrame /home/someuser/project/cpython/./Include/internal/pycore_ceval.h:121:16 (python+0x79c3a0) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #15 _PyEval_Vector /home/someuser/project/cpython/Python/ceval.c:2005:12 (python+0x79c3a0) #16 _PyFunction_Vectorcall /home/someuser/project/cpython/Objects/call.c (python+0x590def) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #17 _PyObject_VectorcallTstate /home/someuser/project/cpython/./Include/internal/pycore_call.h:169:11 (python+0x5956b6) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #18 method_vectorcall /home/someuser/project/cpython/Objects/classobject.c:73:20 (python+0x5956b6) #19 _PyVectorcall_Call /home/someuser/project/cpython/Objects/call.c:273:16 (python+0x590a87) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #20 _PyObject_Call /home/someuser/project/cpython/Objects/call.c:348:16 (python+0x590a87) #21 PyObject_Call /home/someuser/project/cpython/Objects/call.c:373:12 (python+0x590af5) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #22 thread_run /home/someuser/project/cpython/./Modules/_threadmodule.c:387:21 (python+0x96c152) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #23 pythread_wrapper /home/someuser/project/cpython/Python/thread_pthread.h:234:5 (python+0x8a0317) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) Previous atomic read of size 8 at 0x7fb1ed269910 by thread T22: #0 _Py_atomic_load_ptr /home/someuser/project/cpython/./Include/cpython/pyatomic_gcc.h:300:18 (python+0x886ef1) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #1 _Py_TryIncrefCompare /home/someuser/project/cpython/./Include/internal/pycore_object.h:603:15 (python+0x886ef1) #2 PyMember_GetOne /home/someuser/project/cpython/Python/structmember.c:91:18 (python+0x8869ca) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #3 member_get /home/someuser/project/cpython/Objects/descrobject.c:180:12 (python+0x5a8a06) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #4 _Py_type_getattro_impl /home/someuser/project/cpython/Objects/typeobject.c:6363:19 (python+0x6a0992) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #5 _Py_type_getattro /home/someuser/project/cpython/Objects/typeobject.c:6424:12 (python+0x6a0ca0) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #6 PyObject_GetAttr /home/someuser/project/cpython/Objects/object.c:1313:18 (python+0x648a3e) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #7 _PyObject_GetMethodStackRef /home/someuser/project/cpython/Objects/object.c:1706:25 (python+0x64b746) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #8 _PyEval_EvalFrameDefault /home/someuser/project/cpython/Python/generated_cases.c.h:7844:35 (python+0x7b55b4) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #9 _PyEval_EvalFrame /home/someuser/project/cpython/./Include/internal/pycore_ceval.h:121:16 (python+0x79c3a0) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #10 _PyEval_Vector /home/someuser/project/cpython/Python/ceval.c:2005:12 (python+0x79c3a0) #11 _PyFunction_Vectorcall /home/someuser/project/cpython/Objects/call.c (python+0x590def) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #12 _PyObject_VectorcallTstate /home/someuser/project/cpython/./Include/internal/pycore_call.h:169:11 (python+0x5956b6) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #13 method_vectorcall /home/someuser/project/cpython/Objects/classobject.c:73:20 (python+0x5956b6) #14 _PyObject_VectorcallTstate /home/someuser/project/cpython/./Include/internal/pycore_call.h:169:11 (python+0x7f4a21) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #15 context_run /home/someuser/project/cpython/Python/context.c:728:29 (python+0x7f4a21) #16 _PyEval_EvalFrameDefault /home/someuser/project/cpython/Python/generated_cases.c.h:3710:35 (python+0x7a9401) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #17 _PyEval_EvalFrame /home/someuser/project/cpython/./Include/internal/pycore_ceval.h:121:16 (python+0x79c3a0) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #18 _PyEval_Vector /home/someuser/project/cpython/Python/ceval.c:2005:12 (python+0x79c3a0) #19 _PyFunction_Vectorcall /home/someuser/project/cpython/Objects/call.c (python+0x590def) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #20 _PyObject_VectorcallTstate /home/someuser/project/cpython/./Include/internal/pycore_call.h:169:11 (python+0x5956b6) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #21 method_vectorcall /home/someuser/project/cpython/Objects/classobject.c:73:20 (python+0x5956b6) #22 _PyVectorcall_Call /home/someuser/project/cpython/Objects/call.c:273:16 (python+0x590a87) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #23 _PyObject_Call /home/someuser/project/cpython/Objects/call.c:348:16 (python+0x590a87) #24 PyObject_Call /home/someuser/project/cpython/Objects/call.c:373:12 (python+0x590af5) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #25 thread_run /home/someuser/project/cpython/./Modules/_threadmodule.c:387:21 (python+0x96c152) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) #26 pythread_wrapper /home/someuser/project/cpython/Python/thread_pthread.h:234:5 (python+0x8a0317) (BuildId: 111d1b338abaedccddf0af54b80c4dc6c30a747f) Issue: gh-133467

Open Graph Description: Issue #133467 Proposed Changes Fix the race of PyTypeObject::tp_base between typemember __base__ and set of __bases__. Add test case in unit test. Comment Root cause Since the __bases__'s get...

X Description: Issue #133467 Proposed Changes Fix the race of PyTypeObject::tp_base between typemember __base__ and set of __bases__. Add test case in unit test. Comment Root cause Since the __bases__'s...

Opengraph URL: https://github.com/python/cpython/pull/140549

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64583ed fix `PyTypeObject->tp_base` race in free threading LindaSummer Oct 24, 2025 https://github.com/python/cpython/pull/140549/commits/64583edb77f8378c47aabcf1d6f53885d3df5936
f90b5de prevent `TYPE_LOCK` release during stw LindaSummer Nov 4, 2025 https://github.com/python/cpython/pull/140549/commits/f90b5de696d9b826b64fda53d813dafd4aded0cb
d3fe284 add empty macro to remove `Py_GIL_DISABLED` macro guard LindaSummer Nov 5, 2025 https://github.com/python/cpython/pull/140549/commits/d3fe2846cb32db350318beaa2a03a94ef8494fb7
95532d7 remove `set_tp_bases` in race suppression LindaSummer Nov 5, 2025 https://github.com/python/cpython/pull/140549/commits/95532d7004147f84958b11eca4aa3155b78f367f
169c840 update news file LindaSummer Nov 5, 2025 https://github.com/python/cpython/pull/140549/commits/169c840b957904390dfaac02bc047c346d9387e3
fd56672 Merge branch 'main' into bugfix/type-race kumaraditya303 Nov 5, 2025 https://github.com/python/cpython/pull/140549/commits/fd566726797885ccf3901b40982090cb23de4ca6
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