$cd cpython-tsan/bin/$ ./python3.15Python 3.15.0a5+ free-threading build (heads/main:96e4cd698a, Jan 31 2026, 11:45:37) [Clang 18.1.3 (1ubuntu1)] on linuxType"help","copyright","credits" or"license"for more information.

importthreading,times=set(range(2000))it=iter(s)stop=threading.Event()defreader():whilenotstop.is_set():it.__length_hint__()defwriter():i=0whilenotstop.is_set():s.add(i)s.discard(i-1)i+=1threads= [threading.Thread(target=reader)for_inrange(4)]threads.append(threading.Thread(target=writer))fortinthreads:t.start()time.sleep(3)stop.set()fortinthreads:t.join()

$ TSAN_OPTIONS="halt_on_error=1:history_size=7:report_signal_unsafe=0:verbosity=1" ./python3.15 ./tsan_setiter_len_race.py ==1703386==WARNING: ThreadSanitizer: memory layout is incompatible, possibly due to high-entropy ASLR.Re-execing with fixed virtual address space.N.B. reducing ASLR entropy is preferable.==1703386==Installed the sigactionfor signal 11==1703386==Installed the sigactionfor signal 7==1703386==Installed the sigactionfor signal 8***** Running under ThreadSanitizer v3 (pid 1703386)*****==================WARNING: ThreadSanitizer: data race (pid=1703386)  Atomic write of size 8 at 0x7fffb4395ce8 by thread T5:#0 _Py_atomic_store_ssize_relaxed /home/hyongtao/worksapce/cpython/./Include/cpython/pyatomic_gcc.h:513:3 (python3.15+0x30378c) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#1 set_discard_entry /home/hyongtao/worksapce/cpython/Objects/setobject.c:594:5 (python3.15+0x30378c)#2 set_discard_key /home/hyongtao/worksapce/cpython/Objects/setobject.c:630:12 (python3.15+0x30378c)#3 set_discard_impl /home/hyongtao/worksapce/cpython/Objects/setobject.c:2616:10 (python3.15+0x30b3c3) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#4 set_discard /home/hyongtao/worksapce/cpython/Objects/clinic/setobject.c.h:502:20 (python3.15+0x30b3c3)#5 _PyEval_EvalFrameDefault /home/hyongtao/worksapce/cpython/Python/generated_cases.c.h:4033:35 (python3.15+0x42abe4) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#6 _PyEval_EvalFrame /home/hyongtao/worksapce/cpython/./Include/internal/pycore_ceval.h:118:16 (python3.15+0x41f890) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#7 _PyEval_Vector /home/hyongtao/worksapce/cpython/Python/ceval.c:2092:12 (python3.15+0x41f890)#8 _PyFunction_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c (python3.15+0x20b85f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#9 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x20ff36) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#10 method_vectorcall /home/hyongtao/worksapce/cpython/Objects/classobject.c:73:20 (python3.15+0x20ff36)#11 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x472d31) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#12 context_run /home/hyongtao/worksapce/cpython/Python/context.c:727:29 (python3.15+0x472d31)#13 method_vectorcall_FASTCALL_KEYWORDS /home/hyongtao/worksapce/cpython/Objects/descrobject.c:421:24 (python3.15+0x224ab7) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#14 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x20b1e3) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#15 PyObject_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c:327:12 (python3.15+0x20b1e3)#16 _Py_VectorCallInstrumentation_StackRefSteal /home/hyongtao/worksapce/cpython/Python/ceval.c:762:11 (python3.15+0x4204bc) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#17 _PyEval_EvalFrameDefault /home/hyongtao/worksapce/cpython/Python/generated_cases.c.h:1809:35 (python3.15+0x426376) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#18 _PyEval_EvalFrame /home/hyongtao/worksapce/cpython/./Include/internal/pycore_ceval.h:118:16 (python3.15+0x41f890) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#19 _PyEval_Vector /home/hyongtao/worksapce/cpython/Python/ceval.c:2092:12 (python3.15+0x41f890)#20 _PyFunction_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c (python3.15+0x20b85f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#21 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x20ff36) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#22 method_vectorcall /home/hyongtao/worksapce/cpython/Objects/classobject.c:73:20 (python3.15+0x20ff36)#23 _PyVectorcall_Call /home/hyongtao/worksapce/cpython/Objects/call.c:273:16 (python3.15+0x20b4eb) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#24 _PyObject_Call /home/hyongtao/worksapce/cpython/Objects/call.c:348:16 (python3.15+0x20b4eb)#25 PyObject_Call /home/hyongtao/worksapce/cpython/Objects/call.c:373:12 (python3.15+0x20b555) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#26 thread_run /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:387:21 (python3.15+0x5f12e2) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#27 pythread_wrapper /home/hyongtao/worksapce/cpython/Python/thread_pthread.h:234:5 (python3.15+0x522317) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)  Previousread of size 8 at 0x7fffb4395ce8 by thread T3:#0 setiter_len /home/hyongtao/worksapce/cpython/Objects/setobject.c:1059:58 (python3.15+0x304ce9) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#1 _PyEval_EvalFrameDefault /home/hyongtao/worksapce/cpython/Python/generated_cases.c.h:3935:35 (python3.15+0x42a9d4) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#2 _PyEval_EvalFrame /home/hyongtao/worksapce/cpython/./Include/internal/pycore_ceval.h:118:16 (python3.15+0x41f890) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#3 _PyEval_Vector /home/hyongtao/worksapce/cpython/Python/ceval.c:2092:12 (python3.15+0x41f890)#4 _PyFunction_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c (python3.15+0x20b85f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#5 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x20ff36) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#6 method_vectorcall /home/hyongtao/worksapce/cpython/Objects/classobject.c:73:20 (python3.15+0x20ff36)#7 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x472d31) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#8 context_run /home/hyongtao/worksapce/cpython/Python/context.c:727:29 (python3.15+0x472d31)#9 method_vectorcall_FASTCALL_KEYWORDS /home/hyongtao/worksapce/cpython/Objects/descrobject.c:421:24 (python3.15+0x224ab7) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#10 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x20b1e3) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#11 PyObject_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c:327:12 (python3.15+0x20b1e3)#12 _Py_VectorCallInstrumentation_StackRefSteal /home/hyongtao/worksapce/cpython/Python/ceval.c:762:11 (python3.15+0x4204bc) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#13 _PyEval_EvalFrameDefault /home/hyongtao/worksapce/cpython/Python/generated_cases.c.h:1809:35 (python3.15+0x426376) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#14 _PyEval_EvalFrame /home/hyongtao/worksapce/cpython/./Include/internal/pycore_ceval.h:118:16 (python3.15+0x41f890) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#15 _PyEval_Vector /home/hyongtao/worksapce/cpython/Python/ceval.c:2092:12 (python3.15+0x41f890)#16 _PyFunction_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c (python3.15+0x20b85f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#17 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:136:11 (python3.15+0x20ff36) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#18 method_vectorcall /home/hyongtao/worksapce/cpython/Objects/classobject.c:73:20 (python3.15+0x20ff36)#19 _PyVectorcall_Call /home/hyongtao/worksapce/cpython/Objects/call.c:273:16 (python3.15+0x20b4eb) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#20 _PyObject_Call /home/hyongtao/worksapce/cpython/Objects/call.c:348:16 (python3.15+0x20b4eb)#21 PyObject_Call /home/hyongtao/worksapce/cpython/Objects/call.c:373:12 (python3.15+0x20b555) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#22 thread_run /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:387:21 (python3.15+0x5f12e2) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#23 pythread_wrapper /home/hyongtao/worksapce/cpython/Python/thread_pthread.h:234:5 (python3.15+0x522317) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)  Thread T5'Thread-5 (write' (tid=1703392, running) created by main thread at:#0 pthread_create <null> (python3.15+0xf421f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#1 do_start_joinable_thread /home/hyongtao/worksapce/cpython/Python/thread_pthread.h:281:14 (python3.15+0x521424) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#2 PyThread_start_joinable_thread /home/hyongtao/worksapce/cpython/Python/thread_pthread.h:323:9 (python3.15+0x52123a) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#3 ThreadHandle_start /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:474:9 (python3.15+0x5f109a) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#4 do_start_new_thread /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:1920:9 (python3.15+0x5f0b3f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#5 thread_PyThread_start_joinable_thread /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:2043:14 (python3.15+0x5efc01) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#6 cfunction_call /home/hyongtao/worksapce/cpython/Objects/methodobject.c:564:18 (python3.15+0x2bab87) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#7 _PyObject_MakeTpCall /home/hyongtao/worksapce/cpython/Objects/call.c:242:18 (python3.15+0x20a68f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#8 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:134:16 (python3.15+0x20b2a7) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#9 PyObject_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c:327:12 (python3.15+0x20b2a7)#10 _Py_VectorCall_StackRefSteal /home/hyongtao/worksapce/cpython/Python/ceval.c:720:11 (python3.15+0x41fce9) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#11 _PyEval_EvalFrameDefault /home/hyongtao/worksapce/cpython/Python/generated_cases.c.h:3387:35 (python3.15+0x429c79) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#12 _PyEval_EvalFrame /home/hyongtao/worksapce/cpython/./Include/internal/pycore_ceval.h:118:16 (python3.15+0x41f3b0) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#13 _PyEval_Vector /home/hyongtao/worksapce/cpython/Python/ceval.c:2092:12 (python3.15+0x41f3b0)#14 PyEval_EvalCode /home/hyongtao/worksapce/cpython/Python/ceval.c:673:21 (python3.15+0x41f3b0)#15 run_eval_code_obj /home/hyongtao/worksapce/cpython/Python/pythonrun.c:1366:12 (python3.15+0x4fe967) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#16 run_mod /home/hyongtao/worksapce/cpython/Python/pythonrun.c:1469:19 (python3.15+0x4fe967)#17 pyrun_file /home/hyongtao/worksapce/cpython/Python/pythonrun.c:1294:15 (python3.15+0x4f9d13) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#18 _PyRun_SimpleFileObject /home/hyongtao/worksapce/cpython/Python/pythonrun.c:518:13 (python3.15+0x4f9d13)#19 _PyRun_AnyFileObject /home/hyongtao/worksapce/cpython/Python/pythonrun.c:81:15 (python3.15+0x4f9498) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#20 pymain_run_file_obj /home/hyongtao/worksapce/cpython/Modules/main.c:410:15 (python3.15+0x53bedf) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#21 pymain_run_file /home/hyongtao/worksapce/cpython/Modules/main.c:429:15 (python3.15+0x53bedf)#22 pymain_run_python /home/hyongtao/worksapce/cpython/Modules/main.c:691:21 (python3.15+0x53b20b) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#23 Py_RunMain /home/hyongtao/worksapce/cpython/Modules/main.c:772:5 (python3.15+0x53b20b)#24 pymain_main /home/hyongtao/worksapce/cpython/Modules/main.c:802:12 (python3.15+0x53b778) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#25 Py_BytesMain /home/hyongtao/worksapce/cpython/Modules/main.c:826:12 (python3.15+0x53b7fb) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#26 main /home/hyongtao/worksapce/cpython/./Programs/python.c:15:12 (python3.15+0x17282b) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)  Thread T3'Thread-3 (reade' (tid=1703390, running) created by main thread at:#0 pthread_create <null> (python3.15+0xf421f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#1 do_start_joinable_thread /home/hyongtao/worksapce/cpython/Python/thread_pthread.h:281:14 (python3.15+0x521424) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#2 PyThread_start_joinable_thread /home/hyongtao/worksapce/cpython/Python/thread_pthread.h:323:9 (python3.15+0x52123a) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#3 ThreadHandle_start /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:474:9 (python3.15+0x5f109a) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#4 do_start_new_thread /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:1920:9 (python3.15+0x5f0b3f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#5 thread_PyThread_start_joinable_thread /home/hyongtao/worksapce/cpython/./Modules/_threadmodule.c:2043:14 (python3.15+0x5efc01) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#6 cfunction_call /home/hyongtao/worksapce/cpython/Objects/methodobject.c:564:18 (python3.15+0x2bab87) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#7 _PyObject_MakeTpCall /home/hyongtao/worksapce/cpython/Objects/call.c:242:18 (python3.15+0x20a68f) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#8 _PyObject_VectorcallTstate /home/hyongtao/worksapce/cpython/./Include/internal/pycore_call.h:134:16 (python3.15+0x20b2a7) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#9 PyObject_Vectorcall /home/hyongtao/worksapce/cpython/Objects/call.c:327:12 (python3.15+0x20b2a7)#10 _Py_VectorCall_StackRefSteal /home/hyongtao/worksapce/cpython/Python/ceval.c:720:11 (python3.15+0x41fce9) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#11 _PyEval_EvalFrameDefault /home/hyongtao/worksapce/cpython/Python/generated_cases.c.h:3387:35 (python3.15+0x429c79) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#12 _PyEval_EvalFrame /home/hyongtao/worksapce/cpython/./Include/internal/pycore_ceval.h:118:16 (python3.15+0x41f3b0) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#13 _PyEval_Vector /home/hyongtao/worksapce/cpython/Python/ceval.c:2092:12 (python3.15+0x41f3b0)#14 PyEval_EvalCode /home/hyongtao/worksapce/cpython/Python/ceval.c:673:21 (python3.15+0x41f3b0)#15 run_eval_code_obj /home/hyongtao/worksapce/cpython/Python/pythonrun.c:1366:12 (python3.15+0x4fe967) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#16 run_mod /home/hyongtao/worksapce/cpython/Python/pythonrun.c:1469:19 (python3.15+0x4fe967)#17 pyrun_file /home/hyongtao/worksapce/cpython/Python/pythonrun.c:1294:15 (python3.15+0x4f9d13) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#18 _PyRun_SimpleFileObject /home/hyongtao/worksapce/cpython/Python/pythonrun.c:518:13 (python3.15+0x4f9d13)#19 _PyRun_AnyFileObject /home/hyongtao/worksapce/cpython/Python/pythonrun.c:81:15 (python3.15+0x4f9498) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#20 pymain_run_file_obj /home/hyongtao/worksapce/cpython/Modules/main.c:410:15 (python3.15+0x53bedf) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#21 pymain_run_file /home/hyongtao/worksapce/cpython/Modules/main.c:429:15 (python3.15+0x53bedf)#22 pymain_run_python /home/hyongtao/worksapce/cpython/Modules/main.c:691:21 (python3.15+0x53b20b) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#23 Py_RunMain /home/hyongtao/worksapce/cpython/Modules/main.c:772:5 (python3.15+0x53b20b)#24 pymain_main /home/hyongtao/worksapce/cpython/Modules/main.c:802:12 (python3.15+0x53b778) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#25 Py_BytesMain /home/hyongtao/worksapce/cpython/Modules/main.c:826:12 (python3.15+0x53b7fb) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)#26 main /home/hyongtao/worksapce/cpython/./Programs/python.c:15:12 (python3.15+0x17282b) (BuildId: 00135b3b874b2f13c2b74122623dcba7b1b9ce4a)SUMMARY: ThreadSanitizer: data race /home/hyongtao/worksapce/cpython/./Include/cpython/pyatomic_gcc.h:513:3in _Py_atomic_store_ssize_relaxed==================