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Deadlock in 3.15.0rc2 free threading in type_set_abstractmethods · Issue #156910 · python/cpython · GitHub

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Deadlock in 3.15.0rc2 free threading in type_set_abstractmethods #156910

Closed
Closed
Deadlock in 3.15.0rc2 free threading in type_set_abstractmethods#156910
Labels
interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-free-threadingtype-bugAn unexpected behavior, bug, or error

Description

hawkinsp
opened on Sep 3, 2026

Bug report

Bug description:

Reproducer:

import abc
import dataclasses
import itertools
import threading

counter = itertools.count(1)


class Base(abc.ABC):

  @abc.abstractmethod
  def run(self):
    pass


def worker():
  for _ in range(1000):
    step = next(counter)
    if step % 10 == 0:
      print(f"Step {step}", flush=True)

    @dataclasses.dataclass(frozen=True)
    class Sub(Base):
      x: int = 1


threads = [threading.Thread(target=worker) for _ in range(32)]
for t in threads:
  t.start()
for t in threads:
  t.join()

print("Done")

Behavior:

Step 10
Step 20
Step 30
... hangs forever here for me ...

What AI thinks:

In free-threaded CPython, type_set_abstractmethods() in Objects/typeobject.c calls types_stop_world() while holding TYPE_LOCK, but does not call type_lock_prevent_release().
If types_stop_world() blocks on stw->mutex, the thread parks and drops TYPE_LOCK. A second thread running type_setattro()
→
→ apply_type_slot_updates() can then acquire TYPE_LOCK, call type_lock_prevent_release(), and block on stw->mutex while holding TYPE_LOCK. When the first thread acquires stw->mutex and unparks, it attempts to reacquire TYPE_LOCK to resume its critical section, resulting in a deadlock between the two threads over TYPE_LOCK and stw->mutex.

Thread stacks:

Thread 25 (Thread 0x7f89a15ff6c0 (LWP 2593526) "Thread-1 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89a15fe258, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89a15fe258, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89a15fe258, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89a15fe258, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89a15fe258, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d769ca in type_ready_publish[cold] ()
#11 0x0000000001a5afce in type_new ()
#12 0x0000000001a21466 in tp_new_wrapper ()
#13 0x0000000001a229c5 in _TAIL_CALL_CALL_EX_NON_PY_GENERAL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a4892d in slot_tp_new ()
#16 0x0000000001a0c548 in type_call ()
#17 0x0000000001a6758a in _PyObject_MakeTpCall ()
#18 0x0000000001a49b7a in builtin___build_class__ ()
#19 0x0000000001a270c6 in _TAIL_CALL_CALL_BUILTIN_FAST_WITH_KEYWORDS ()
#20 0x0000000001a13086 in _PyFunction_Vectorcall ()
#21 0x0000000001a12a8c in method_vectorcall.llvm ()
#22 0x0000000001b4fa9c in context_run ()
#23 0x0000000001a249fc in _TAIL_CALL_CALL ()
#24 0x0000000001a13086 in _PyFunction_Vectorcall ()
#25 0x0000000001a12a8c in method_vectorcall.llvm ()
#26 0x0000000001c103c7 in thread_run ()
#27 0x0000000001c10334 in pythread_wrapper.llvm ()
#28 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#29 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 24 (Thread 0x7f89a0dfe6c0 (LWP 2593527) "Thread-2 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89a0dfd298, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89a0dfd298, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89a0dfd298, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89a0dfd298, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89a0dfd298, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e2a195 in type_get_bases[cold] ()
#11 0x0000000001a17e61 in _Py_type_getattro_impl ()
#12 0x0000000001a951f6 in _abc__abc_init ()
#13 0x0000000001a02e2c in _TAIL_CALL_CALL_BUILTIN_O ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a4892d in slot_tp_new ()
#16 0x0000000001a0c548 in type_call ()
#17 0x0000000001a6758a in _PyObject_MakeTpCall ()
#18 0x0000000001a49b7a in builtin___build_class__ ()
#19 0x0000000001a270c6 in _TAIL_CALL_CALL_BUILTIN_FAST_WITH_KEYWORDS ()
#20 0x0000000001a13086 in _PyFunction_Vectorcall ()
#21 0x0000000001a12a8c in method_vectorcall.llvm ()
#22 0x0000000001b4fa9c in context_run ()
#23 0x0000000001a249fc in _TAIL_CALL_CALL ()
#24 0x0000000001a13086 in _PyFunction_Vectorcall ()
#25 0x0000000001a12a8c in method_vectorcall.llvm ()
#26 0x0000000001c103c7 in thread_run ()
#27 0x0000000001c10334 in pythread_wrapper.llvm ()
#28 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#29 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 23 (Thread 0x7f899bfff6c0 (LWP 2593528) "Thread-3 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f899bffe668, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f899bffe668, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f899bffe668, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f899bffe668, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f899bffe668, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e2a195 in type_get_bases[cold] ()
#11 0x0000000001a48d42 in _Py_type_getattro_stackref ()
#12 0x0000000001a16dbf in _TAIL_CALL_LOAD_ATTR ()
#13 0x0000000001a13086 in _PyFunction_Vectorcall ()
#14 0x0000000001a12a8c in method_vectorcall.llvm ()
#15 0x0000000001b4fa9c in context_run ()
#16 0x0000000001a249fc in _TAIL_CALL_CALL ()
#17 0x0000000001a13086 in _PyFunction_Vectorcall ()
#18 0x0000000001a12a8c in method_vectorcall.llvm ()
#19 0x0000000001c103c7 in thread_run ()
#20 0x0000000001c10334 in pythread_wrapper.llvm ()
#21 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#22 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 22 (Thread 0x7f899b7fe6c0 (LWP 2593529) "Thread-4 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f899b7fd318, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f899b7fd318, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f899b7fd318, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f899b7fd318, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f899b7fd318, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e1a514 in stop_the_world.llvm[cold] ()
#11 0x0000000001aca8db in type_setattro ()
#12 0x0000000001a39a7b in PyObject_SetAttr ()
#13 0x0000000001a399bd in builtin_setattr ()
#14 0x0000000001a05ae4 in _TAIL_CALL_CALL_BUILTIN_FAST ()
#15 0x0000000001a13086 in _PyFunction_Vectorcall ()
#16 0x0000000001a12a8c in method_vectorcall.llvm ()
#17 0x0000000001b4fa9c in context_run ()
#18 0x0000000001a249fc in _TAIL_CALL_CALL ()
#19 0x0000000001a13086 in _PyFunction_Vectorcall ()
#20 0x0000000001a12a8c in method_vectorcall.llvm ()
#21 0x0000000001c103c7 in thread_run ()
#22 0x0000000001c10334 in pythread_wrapper.llvm ()
#23 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#24 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 21 (Thread 0x7f899affd6c0 (LWP 2593530) "Thread-5 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f899affc5b8, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f899affc5b8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f899affc5b8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f899affc5b8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f899affc5b8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a05936 in builtin_getattr ()
#13 0x0000000001a05ae4 in _TAIL_CALL_CALL_BUILTIN_FAST ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 20 (Thread 0x7f899a7fc6c0 (LWP 2593531) "Thread-6 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f899a7fb5b8, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f899a7fb5b8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f899a7fb5b8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f899a7fb5b8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f899a7fb5b8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a05936 in builtin_getattr ()
#13 0x0000000001a05ae4 in _TAIL_CALL_CALL_BUILTIN_FAST ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 19 (Thread 0x7f8999ffb6c0 (LWP 2593532) "Thread-7 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8999ff9db8, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8999ff9db8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8999ff9db8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8999ff9db8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8999ff9db8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d4a632 in _PyThreadState_Attach.warm ()
#11 0x0000000001b0047b in _PyParkingLot_Park ()
#12 0x0000000001a51028 in _PyMutex_LockTimed ()
#13 0x0000000001e1a514 in stop_the_world.llvm[cold] ()
#14 0x0000000001acb2c5 in type_set_abstractmethods ()
#15 0x0000000001aca675 in type_setattro ()
#16 0x0000000001a39a7b in PyObject_SetAttr ()
#17 0x0000000001a953d3 in _abc__abc_init ()
#18 0x0000000001a02e2c in _TAIL_CALL_CALL_BUILTIN_O ()
#19 0x0000000001a13086 in _PyFunction_Vectorcall ()
#20 0x0000000001a4892d in slot_tp_new ()
#21 0x0000000001a0c548 in type_call ()
#22 0x0000000001a6758a in _PyObject_MakeTpCall ()
#23 0x0000000001a49b7a in builtin___build_class__ ()
#24 0x0000000001a270c6 in _TAIL_CALL_CALL_BUILTIN_FAST_WITH_KEYWORDS ()
#25 0x0000000001a13086 in _PyFunction_Vectorcall ()
#26 0x0000000001a12a8c in method_vectorcall.llvm ()
#27 0x0000000001b4fa9c in context_run ()
#28 0x0000000001a249fc in _TAIL_CALL_CALL ()
#29 0x0000000001a13086 in _PyFunction_Vectorcall ()
#30 0x0000000001a12a8c in method_vectorcall.llvm ()
#31 0x0000000001c103c7 in thread_run ()
#32 0x0000000001c10334 in pythread_wrapper.llvm ()
#33 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#34 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 18 (Thread 0x7f89997fa6c0 (LWP 2593533) "Thread-8 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89997f9608, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89997f9608, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89997f9608, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89997f9608, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89997f9608, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001b1a48a in _PyCriticalSection_BeginSlow ()
#11 0x0000000001e15299 in _PyType_LookupRefAndVersion.cold ()
#12 0x0000000001ac4297 in analyze_descriptor_load ()
#13 0x0000000001ac3890 in _Py_Specialize_LoadAttr ()
#14 0x0000000001a173e9 in _TAIL_CALL_LOAD_ATTR ()
#15 0x0000000001a13086 in _PyFunction_Vectorcall ()
#16 0x0000000001a12a8c in method_vectorcall.llvm ()
#17 0x0000000001b4fa9c in context_run ()
#18 0x0000000001a249fc in _TAIL_CALL_CALL ()
#19 0x0000000001a13086 in _PyFunction_Vectorcall ()
#20 0x0000000001a12a8c in method_vectorcall.llvm ()
#21 0x0000000001c103c7 in thread_run ()
#22 0x0000000001c10334 in pythread_wrapper.llvm ()
#23 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#24 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 17 (Thread 0x7f8998ff96c0 (LWP 2593534) "Thread-9 (worke"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8998ff7f08, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8998ff7f08, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8998ff7f08, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8998ff7f08, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8998ff7f08, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e1a514 in stop_the_world.llvm[cold] ()
#11 0x0000000001acb2c5 in type_set_abstractmethods ()
#12 0x0000000001aca675 in type_setattro ()
#13 0x0000000001a39a7b in PyObject_SetAttr ()
#14 0x0000000001a953d3 in _abc__abc_init ()
#15 0x0000000001a02e2c in _TAIL_CALL_CALL_BUILTIN_O ()
#16 0x0000000001a13086 in _PyFunction_Vectorcall ()
#17 0x0000000001a4892d in slot_tp_new ()
#18 0x0000000001a0c548 in type_call ()
#19 0x0000000001a6758a in _PyObject_MakeTpCall ()
#20 0x0000000001a49b7a in builtin___build_class__ ()
#21 0x0000000001a270c6 in _TAIL_CALL_CALL_BUILTIN_FAST_WITH_KEYWORDS ()
#22 0x0000000001a13086 in _PyFunction_Vectorcall ()
#23 0x0000000001a12a8c in method_vectorcall.llvm ()
#24 0x0000000001b4fa9c in context_run ()
#25 0x0000000001a249fc in _TAIL_CALL_CALL ()
#26 0x0000000001a13086 in _PyFunction_Vectorcall ()
#27 0x0000000001a12a8c in method_vectorcall.llvm ()
#28 0x0000000001c103c7 in thread_run ()
#29 0x0000000001c10334 in pythread_wrapper.llvm ()
#30 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#31 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 16 (Thread 0x7f8977fff6c0 (LWP 2593535) "Thread-10 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8977ffdf58, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8977ffdf58, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8977ffdf58, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8977ffdf58, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8977ffdf58, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e1a2c0 in type_set_abstractmethods[cold] ()
#11 0x0000000001aca675 in type_setattro ()
#12 0x0000000001a39a7b in PyObject_SetAttr ()
#13 0x0000000001a953d3 in _abc__abc_init ()
#14 0x0000000001a02e2c in _TAIL_CALL_CALL_BUILTIN_O ()
#15 0x0000000001a13086 in _PyFunction_Vectorcall ()
#16 0x0000000001a4892d in slot_tp_new ()
#17 0x0000000001a0c548 in type_call ()
#18 0x0000000001a6758a in _PyObject_MakeTpCall ()
#19 0x0000000001a49b7a in builtin___build_class__ ()
#20 0x0000000001a270c6 in _TAIL_CALL_CALL_BUILTIN_FAST_WITH_KEYWORDS ()
#21 0x0000000001a13086 in _PyFunction_Vectorcall ()
#22 0x0000000001a12a8c in method_vectorcall.llvm ()
#23 0x0000000001b4fa9c in context_run ()
#24 0x0000000001a249fc in _TAIL_CALL_CALL ()
#25 0x0000000001a13086 in _PyFunction_Vectorcall ()
#26 0x0000000001a12a8c in method_vectorcall.llvm ()
#27 0x0000000001c103c7 in thread_run ()
#28 0x0000000001c10334 in pythread_wrapper.llvm ()
#29 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#30 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 15 (Thread 0x7f89777fe6c0 (LWP 2593536) "Thread-11 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89777fd588, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89777fd588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89777fd588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89777fd588, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89777fd588, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a05936 in builtin_getattr ()
#13 0x0000000001a249fc in _TAIL_CALL_CALL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 14 (Thread 0x7f8976ffd6c0 (LWP 2593537) "Thread-12 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8976ffc668, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8976ffc668, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8976ffc668, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8976ffc668, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8976ffc668, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e2a195 in type_get_bases[cold] ()
#11 0x0000000001a48d42 in _Py_type_getattro_stackref ()
#12 0x0000000001a16dbf in _TAIL_CALL_LOAD_ATTR ()
#13 0x0000000001a13086 in _PyFunction_Vectorcall ()
#14 0x0000000001a12a8c in method_vectorcall.llvm ()
#15 0x0000000001b4fa9c in context_run ()
#16 0x0000000001a249fc in _TAIL_CALL_CALL ()
#17 0x0000000001a13086 in _PyFunction_Vectorcall ()
#18 0x0000000001a12a8c in method_vectorcall.llvm ()
#19 0x0000000001c103c7 in thread_run ()
#20 0x0000000001c10334 in pythread_wrapper.llvm ()
#21 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#22 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 13 (Thread 0x7f89767fc6c0 (LWP 2593538) "Thread-13 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89767fb338, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89767fb338, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89767fb338, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89767fb338, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89767fb338, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001c51c0a in _PyCriticalSection2_BeginSlow ()
#11 0x0000000001e19776 in type_setattro[cold] ()
#12 0x0000000001a39a7b in PyObject_SetAttr ()
#13 0x0000000001a399bd in builtin_setattr ()
#14 0x0000000001a05ae4 in _TAIL_CALL_CALL_BUILTIN_FAST ()
#15 0x0000000001a13086 in _PyFunction_Vectorcall ()
#16 0x0000000001a12a8c in method_vectorcall.llvm ()
#17 0x0000000001b4fa9c in context_run ()
#18 0x0000000001a249fc in _TAIL_CALL_CALL ()
#19 0x0000000001a13086 in _PyFunction_Vectorcall ()
#20 0x0000000001a12a8c in method_vectorcall.llvm ()
#21 0x0000000001c103c7 in thread_run ()
#22 0x0000000001c10334 in pythread_wrapper.llvm ()
#23 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#24 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 12 (Thread 0x7f8975ffb6c0 (LWP 2593539) "Thread-14 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8975ffa338, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8975ffa338, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8975ffa338, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8975ffa338, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8975ffa338, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001c51c0a in _PyCriticalSection2_BeginSlow ()
#11 0x0000000001e19776 in type_setattro[cold] ()
#12 0x0000000001a39a7b in PyObject_SetAttr ()
#13 0x0000000001a399bd in builtin_setattr ()
#14 0x0000000001a05ae4 in _TAIL_CALL_CALL_BUILTIN_FAST ()
#15 0x0000000001a13086 in _PyFunction_Vectorcall ()
#16 0x0000000001a12a8c in method_vectorcall.llvm ()
#17 0x0000000001b4fa9c in context_run ()
#18 0x0000000001a249fc in _TAIL_CALL_CALL ()
#19 0x0000000001a13086 in _PyFunction_Vectorcall ()
#20 0x0000000001a12a8c in method_vectorcall.llvm ()
#21 0x0000000001c103c7 in thread_run ()
#22 0x0000000001c10334 in pythread_wrapper.llvm ()
#23 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#24 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 11 (Thread 0x7f89757fa6c0 (LWP 2593540) "Thread-15 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89757f96c8, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89757f96c8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89757f96c8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89757f96c8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89757f96c8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e1a514 in stop_the_world.llvm[cold] ()
#11 0x0000000001acb52e in func_set_qualname ()
#12 0x0000000001a39eda in PyObject_GenericSetAttr ()
#13 0x0000000001a39c2d in _TAIL_CALL_STORE_ATTR ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 10 (Thread 0x7f8974ff96c0 (LWP 2593541) "Thread-16 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8974ff8598, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8974ff8598, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8974ff8598, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8974ff8598, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8974ff8598, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a1932a in builtin_hasattr ()
#13 0x0000000001a249fc in _TAIL_CALL_CALL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 9 (Thread 0x7f8957fff6c0 (LWP 2593542) "Thread-17 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8957ffe598, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8957ffe598, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8957ffe598, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8957ffe598, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8957ffe598, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a1932a in builtin_hasattr ()
#13 0x0000000001a249fc in _TAIL_CALL_CALL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 8 (Thread 0x7f89577fe6c0 (LWP 2593543) "Thread-18 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89577fd588, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89577fd588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89577fd588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89577fd588, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89577fd588, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a05936 in builtin_getattr ()
#13 0x0000000001a249fc in _TAIL_CALL_CALL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 7 (Thread 0x7f8956ffd6c0 (LWP 2593544) "Thread-19 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8956ffc308, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8956ffc308, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8956ffc308, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8956ffc308, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8956ffc308, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001c51c0a in _PyCriticalSection2_BeginSlow ()
#11 0x0000000001e19776 in type_setattro[cold] ()
#12 0x0000000001a39a7b in PyObject_SetAttr ()
#13 0x0000000001a399bd in builtin_setattr ()
#14 0x0000000001a249fc in _TAIL_CALL_CALL ()
#15 0x0000000001a13086 in _PyFunction_Vectorcall ()
#16 0x0000000001a12a8c in method_vectorcall.llvm ()
#17 0x0000000001b4fa9c in context_run ()
#18 0x0000000001a249fc in _TAIL_CALL_CALL ()
#19 0x0000000001a13086 in _PyFunction_Vectorcall ()
#20 0x0000000001a12a8c in method_vectorcall.llvm ()
#21 0x0000000001c103c7 in thread_run ()
#22 0x0000000001c10334 in pythread_wrapper.llvm ()
#23 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#24 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 6 (Thread 0x7f89567fc6c0 (LWP 2593545) "Thread-20 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89567fb588, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89567fb588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89567fb588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89567fb588, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89567fb588, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a05936 in builtin_getattr ()
#13 0x0000000001a249fc in _TAIL_CALL_CALL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a12a8c in method_vectorcall.llvm ()
#16 0x0000000001b4fa9c in context_run ()
#17 0x0000000001a249fc in _TAIL_CALL_CALL ()
#18 0x0000000001a13086 in _PyFunction_Vectorcall ()
#19 0x0000000001a12a8c in method_vectorcall.llvm ()
#20 0x0000000001c103c7 in thread_run ()
#21 0x0000000001c10334 in pythread_wrapper.llvm ()
#22 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#23 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 5 (Thread 0x7f8955ffb6c0 (LWP 2593546) "Thread-21 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8955ffa138, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8955ffa138, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8955ffa138, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8955ffa138, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8955ffa138, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d8bdbb in _Py_type_getattro_impl.cold ()
#11 0x0000000001a19717 in PyObject_GetOptionalAttr ()
#12 0x0000000001a952b3 in _abc__abc_init ()
#13 0x0000000001a249fc in _TAIL_CALL_CALL ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a4892d in slot_tp_new ()
#16 0x0000000001a0c548 in type_call ()
#17 0x0000000001a6758a in _PyObject_MakeTpCall ()
#18 0x0000000001a49b7a in builtin___build_class__ ()
#19 0x0000000001a249fc in _TAIL_CALL_CALL ()
#20 0x0000000001a13086 in _PyFunction_Vectorcall ()
#21 0x0000000001a12a8c in method_vectorcall.llvm ()
#22 0x0000000001b4fa9c in context_run ()
#23 0x0000000001a249fc in _TAIL_CALL_CALL ()
#24 0x0000000001a13086 in _PyFunction_Vectorcall ()
#25 0x0000000001a12a8c in method_vectorcall.llvm ()
#26 0x0000000001c103c7 in thread_run ()
#27 0x0000000001c10334 in pythread_wrapper.llvm ()
#28 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#29 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 4 (Thread 0x7f89557fa6c0 (LWP 2593547) "Thread-22 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f89557f9248, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f89557f9248, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f89557f9248, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f89557f9248, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f89557f9248, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d769ca in type_ready_publish[cold] ()
#11 0x0000000001a5afce in type_new ()
#12 0x0000000001a21466 in tp_new_wrapper ()
#13 0x0000000001a82b14 in _TAIL_CALL_CALL_FUNCTION_EX ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a4892d in slot_tp_new ()
#16 0x0000000001a0c548 in type_call ()
#17 0x0000000001a6758a in _PyObject_MakeTpCall ()
#18 0x0000000001a49b7a in builtin___build_class__ ()
#19 0x0000000001a249fc in _TAIL_CALL_CALL ()
#20 0x0000000001a13086 in _PyFunction_Vectorcall ()
#21 0x0000000001a12a8c in method_vectorcall.llvm ()
#22 0x0000000001b4fa9c in context_run ()
#23 0x0000000001a249fc in _TAIL_CALL_CALL ()
#24 0x0000000001a13086 in _PyFunction_Vectorcall ()
#25 0x0000000001a12a8c in method_vectorcall.llvm ()
#26 0x0000000001c103c7 in thread_run ()
#27 0x0000000001c10334 in pythread_wrapper.llvm ()
#28 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#29 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 3 (Thread 0x7f8954ff96c0 (LWP 2593548) "Thread-23 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8954ff8248, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8954ff8248, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8954ff8248, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8954ff8248, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8954ff8248, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001d769ca in type_ready_publish[cold] ()
#11 0x0000000001a5afce in type_new ()
#12 0x0000000001a21466 in tp_new_wrapper ()
#13 0x0000000001a82b14 in _TAIL_CALL_CALL_FUNCTION_EX ()
#14 0x0000000001a13086 in _PyFunction_Vectorcall ()
#15 0x0000000001a4892d in slot_tp_new ()
#16 0x0000000001a0c548 in type_call ()
#17 0x0000000001a6758a in _PyObject_MakeTpCall ()
#18 0x0000000001a49b7a in builtin___build_class__ ()
#19 0x0000000001a249fc in _TAIL_CALL_CALL ()
#20 0x0000000001a13086 in _PyFunction_Vectorcall ()
#21 0x0000000001a12a8c in method_vectorcall.llvm ()
#22 0x0000000001b4fa9c in context_run ()
#23 0x0000000001a249fc in _TAIL_CALL_CALL ()
#24 0x0000000001a13086 in _PyFunction_Vectorcall ()
#25 0x0000000001a12a8c in method_vectorcall.llvm ()
#26 0x0000000001c103c7 in thread_run ()
#27 0x0000000001c10334 in pythread_wrapper.llvm ()
#28 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#29 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 2 (Thread 0x7f8937fff6c0 (LWP 2593549) "Thread-24 (work"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7f8937ffeaa8, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7f8937ffeaa8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f8937ffeaa8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7f8937ffeaa8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7f8937ffeaa8, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001e290cc in _PyType_Validate.cold ()
#11 0x0000000001aeb7c1 in _Py_Specialize_ToBool ()
#12 0x0000000001a0899b in _TAIL_CALL_TO_BOOL ()
#13 0x0000000001a13086 in _PyFunction_Vectorcall ()
#14 0x0000000001a12a8c in method_vectorcall.llvm ()
#15 0x0000000001c103c7 in thread_run ()
#16 0x0000000001c10334 in pythread_wrapper.llvm ()
#17 0x00007f89a1aa0918 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:454
#18 0x00007f89a1b1efd8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Thread 1 (Thread 0x7f89a1a08780 (LWP 2593525) "python"):
#0  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
#1  0x00007f89a1a9d534 in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=a3@entry=0, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at ./nptl/cancellation.c:49
#2  0x00007f89a1a9d7ec in __futex_abstimed_wait_common64 (private=<optimized out>, futex_word=0x7fffee499b58, expected=0, op=<optimized out>, abstime=0x0, cancel=true) at ./nptl/futex-internal.c:57
#3  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7fffee499b58, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>, cancel=cancel@entry=true) at ./nptl/futex-internal.c:87
#4  0x00007f89a1a9d84b in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7fffee499b58, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=<optimized out>) at ./nptl/futex-internal.c:139
#5  0x00007f89a1aa88ff in do_futex_wait (sem=sem@entry=0x7fffee499b58, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:111
#6  0x00007f89a1aa8988 in __new_sem_wait_slow64 (sem=0x7fffee499b58, abstime=0x0, clockid=0) at ./nptl/sem_waitcommon.c:183
#7  0x0000000001b00537 in _PySemaphore_Wait ()
#8  0x0000000001b0045c in _PyParkingLot_Park ()
#9  0x0000000001a51028 in _PyMutex_LockTimed ()
#10 0x0000000001a50d02 in _thread_lock_acquire ()
#11 0x0000000001a89eab in _TAIL_CALL_CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS ()
#12 0x0000000001a4a218 in _PyEval_Vector ()
#13 0x0000000001a49ed5 in PyEval_EvalCode ()
#14 0x0000000001ae12e2 in run_mod ()
#15 0x0000000001c94074 in _PyRun_File ()
#16 0x0000000001c93d27 in _PyRun_SimpleFile ()
#17 0x0000000001c93c0a in _PyRun_AnyFile ()
#18 0x0000000001c13e49 in pymain_run_file_obj ()
#19 0x0000000001c13d71 in pymain_run_file ()
#20 0x0000000001c149fd in Py_RunMain ()
#21 0x0000000001bb7f46 in pymain_main.llvm ()
#22 0x0000000001bb7d6c in main ()

Seen in the wild in JAX's CI: https://github.com/jax-ml/jax/actions/runs/33753988539/job/100643881814

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Linked PRs

Activity

  1. hawkinsp
    added
    type-bugAn unexpected behavior, bug, or error
    on Sep 3, 2026
  2. copybara-service
    added 2 commits that reference this issue on Sep 3, 2026

    Work around python/cpython#156910

    2cc41e9

    Work around python/cpython#156910

    b7f5582
  3. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    topic-free-threading
    on Sep 3, 2026
  4. kumaraditya303
    added a commit that references this issue on Sep 9, 2026

    gh-156910: fix deadlock in type_set_abstractmethods under free-thread…

    1ac3bfa
  5. kumaraditya303
    closed this as completedon Sep 9, 2026
  6. maurycy
    added a commit that references this issue on Sep 10, 2026

    Merge branch 'main' into tachyon-native-callable

    e028ff5
  7. hugovk
    added a commit that references this issue on Sep 11, 2026

    [3.15] gh-156910: fix deadlock in type_set_abstractmethods under free…

    090b5cd
  8. clin1234
    added a commit that references this issue on Sep 12, 2026

    pythongh-156910: fix deadlock in type_set_abstractmethods under free-…

    c390fd0
  9. johnslavik
    added a commit that references this issue on Sep 14, 2026

    pythongh-156910: fix deadlock in type_set_abstractmethods under free-…

    8982446
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