importconcurrent.futuresimportfunctoolsimportsysimportthreadingnum_threads=8defcount(n):ifn>0:returncount(n-1)+1return0defclosure(b):b.wait()sys.setrecursionlimit(100)count(50)withconcurrent.futures.ThreadPoolExecutor(max_workers=num_threads)asexecutor:for_inrange(100):b=threading.Barrier(num_threads)for_inrange(num_threads):executor.submit(functools.partial(closure,b))

WARNING: ThreadSanitizer: data race (pid=3579557)  Write of size 4 at 0x72a40001e02c by thread T8:    #0 Py_SetRecursionLimit /usr/local/google/home/phawkins/p/cpython/Python/ceval.c:272:35 (python3.13+0x3dd302) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #1 sys_setrecursionlimit_impl /usr/local/google/home/phawkins/p/cpython/./Python/sysmodule.c:1319:5 (python3.13+0x4bab67) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #2 sys_setrecursionlimit /usr/local/google/home/phawkins/p/cpython/./Python/clinic/sysmodule.c.h:509:20 (python3.13+0x4bab67)    #3 cfunction_vectorcall_O /usr/local/google/home/phawkins/p/cpython/Objects/methodobject.c:512:24 (python3.13+0x28a3c5) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #4 _PyObject_VectorcallTstate /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_call.h:168:11 (python3.13+0x1eafea) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #5 PyObject_Vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/call.c:327:12 (python3.13+0x1eafea)    #6 _PyEval_EvalFrameDefault /usr/local/google/home/phawkins/p/cpython/Python/generated_cases.c.h:813:23 (python3.13+0x3e290b) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #7 _PyEval_EvalFrame /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_ceval.h:119:16 (python3.13+0x3dea3a) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #8 _PyEval_Vector /usr/local/google/home/phawkins/p/cpython/Python/ceval.c:1807:12 (python3.13+0x3dea3a)    #9 _PyFunction_Vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/call.c (python3.13+0x1eb65f) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #10 _PyObject_VectorcallTstate /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_call.h:168:11 (python3.13+0x572352) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #11 partial_vectorcall /usr/local/google/home/phawkins/p/cpython/./Modules/_functoolsmodule.c:252:16 (python3.13+0x572352)    #12 _PyVectorcall_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:273:16 (python3.13+0x1eb2d3) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #13 _PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:348:16 (python3.13+0x1eb2d3)    #14 PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:373:12 (python3.13+0x1eb355) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #15 _PyEval_EvalFrameDefault /usr/local/google/home/phawkins/p/cpython/Python/generated_cases.c.h:1355:26 (python3.13+0x3e4af2) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #16 _PyEval_EvalFrame /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_ceval.h:119:16 (python3.13+0x3dea3a) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #17 _PyEval_Vector /usr/local/google/home/phawkins/p/cpython/Python/ceval.c:1807:12 (python3.13+0x3dea3a)    #18 _PyFunction_Vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/call.c (python3.13+0x1eb65f) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #19 _PyObject_VectorcallTstate /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_call.h:168:11 (python3.13+0x1ef62f) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #20 method_vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/classobject.c:70:20 (python3.13+0x1ef62f)    #21 _PyVectorcall_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:273:16 (python3.13+0x1eb2d3) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #22 _PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:348:16 (python3.13+0x1eb2d3)    #23 PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:373:12 (python3.13+0x1eb355) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #24 thread_run /usr/local/google/home/phawkins/p/cpython/./Modules/_threadmodule.c:337:21 (python3.13+0x564a32) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #25 pythread_wrapper /usr/local/google/home/phawkins/p/cpython/Python/thread_pthread.h:243:5 (python3.13+0x4bddb7) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)  Previous write of size 4 at 0x72a40001e02c by thread T7:    #0 _Py_LeaveRecursiveCallPy /usr/local/google/home/phawkins/p/cpython/Python/ceval_macros.h:389:35 (python3.13+0x3f3993) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #1 _PyEval_EvalFrameDefault /usr/local/google/home/phawkins/p/cpython/Python/generated_cases.c.h:5257:13 (python3.13+0x3f3993)    #2 _PyEval_EvalFrame /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_ceval.h:119:16 (python3.13+0x3dea3a) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #3 _PyEval_Vector /usr/local/google/home/phawkins/p/cpython/Python/ceval.c:1807:12 (python3.13+0x3dea3a)    #4 _PyFunction_Vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/call.c (python3.13+0x1eb65f) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #5 _PyObject_VectorcallTstate /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_call.h:168:11 (python3.13+0x572352) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #6 partial_vectorcall /usr/local/google/home/phawkins/p/cpython/./Modules/_functoolsmodule.c:252:16 (python3.13+0x572352)    #7 _PyVectorcall_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:273:16 (python3.13+0x1eb2d3) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #8 _PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:348:16 (python3.13+0x1eb2d3)    #9 PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:373:12 (python3.13+0x1eb355) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #10 _PyEval_EvalFrameDefault /usr/local/google/home/phawkins/p/cpython/Python/generated_cases.c.h:1355:26 (python3.13+0x3e4af2) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #11 _PyEval_EvalFrame /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_ceval.h:119:16 (python3.13+0x3dea3a) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #12 _PyEval_Vector /usr/local/google/home/phawkins/p/cpython/Python/ceval.c:1807:12 (python3.13+0x3dea3a)    #13 _PyFunction_Vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/call.c (python3.13+0x1eb65f) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #14 _PyObject_VectorcallTstate /usr/local/google/home/phawkins/p/cpython/./Include/internal/pycore_call.h:168:11 (python3.13+0x1ef62f) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #15 method_vectorcall /usr/local/google/home/phawkins/p/cpython/Objects/classobject.c:70:20 (python3.13+0x1ef62f)    #16 _PyVectorcall_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:273:16 (python3.13+0x1eb2d3) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #17 _PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:348:16 (python3.13+0x1eb2d3)    #18 PyObject_Call /usr/local/google/home/phawkins/p/cpython/Objects/call.c:373:12 (python3.13+0x1eb355) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #19 thread_run /usr/local/google/home/phawkins/p/cpython/./Modules/_threadmodule.c:337:21 (python3.13+0x564a32) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)    #20 pythread_wrapper /usr/local/google/home/phawkins/p/cpython/Python/thread_pthread.h:243:5 (python3.13+0x4bddb7) (BuildId: 19c569fa942016d8ac49d19fd40ccb1ddded939b)