pitrou commented on issue #43497:
URL: https://github.com/apache/arrow/issues/43497#issuecomment-3019004300

   And the other 2 threads are just waiting for thread pool shutdown:
   ```
   Thread 3 (Thread 0x76985a3f3080 (LWP 94748)):
   #0  0x000076985a098d71 in __futex_abstimed_wait_common64 (private=-1, 
cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x35b339a4) at 
./nptl/futex-internal.c:57
   #1  __futex_abstimed_wait_common (cancel=true, private=-1, abstime=0x0, 
clockid=0, expected=0, futex_word=0x35b339a4) at ./nptl/futex-internal.c:87
   #2  __GI___futex_abstimed_wait_cancelable64 
(futex_word=futex_word@entry=0x35b339a4, expected=expected@entry=0, 
clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at 
./nptl/futex-internal.c:139
   #3  0x000076985a09b7ed in __pthread_cond_wait_common (abstime=0x0, 
clockid=0, mutex=0x35b33920, cond=0x35b33978) at ./nptl/pthread_cond_wait.c:503
   #4  ___pthread_cond_wait (cond=0x35b33978, mutex=0x35b33920) at 
./nptl/pthread_cond_wait.c:627
   #5  0x00007698584b9047 in 
std::condition_variable::wait(std::unique_lock<std::mutex>&) () from 
/lib/x86_64-linux-gnu/libstdc++.so.6
   #6  0x00007698538949fb in arrow::internal::ThreadPool::Shutdown(bool) () 
from 
/home/antoine/t/venv-3.12/lib/python3.12/site-packages/pyarrow/libarrow.so.2100
   #7  0x000076985389ad6f in std::_Sp_counted_ptr<arrow::internal::ThreadPool*, 
(__gnu_cxx::_Lock_policy)2>::_M_dispose() () from 
/home/antoine/t/venv-3.12/lib/python3.12/site-packages/pyarrow/libarrow.so.2100
   #8  0x0000769853182727 in 
std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() () from 
/home/antoine/t/venv-3.12/lib/python3.12/site-packages/pyarrow/libarrow.so.2100
   #9  0x000076985a047a76 in __run_exit_handlers (status=0, listp=<optimized 
out>, run_list_atexit=run_list_atexit@entry=true, 
run_dtors=run_dtors@entry=true) at ./stdlib/exit.c:108
   #10 0x000076985a047bbe in __GI_exit (status=<optimized out>) at 
./stdlib/exit.c:138
   #11 0x000076985a02a1d1 in __libc_start_call_main (main=main@entry=0x518950, 
argc=argc@entry=2, argv=argv@entry=0x7fff97594798) at 
../sysdeps/nptl/libc_start_call_main.h:74
   #12 0x000076985a02a28b in __libc_start_main_impl (main=0x518950, argc=2, 
argv=0x7fff97594798, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7fff97594788) at ../csu/libc-start.c:360
   #13 0x00000000006575a5 in _start ()
   
   Thread 2 (Thread 0x7698523ff6c0 (LWP 94749)):
   #0  0x000076985a098d71 in __futex_abstimed_wait_common64 (private=30360, 
cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x769852a16630) at 
./nptl/futex-internal.c:57
   #1  __futex_abstimed_wait_common (cancel=true, private=30360, abstime=0x0, 
clockid=0, expected=0, futex_word=0x769852a16630) at ./nptl/futex-internal.c:87
   #2  __GI___futex_abstimed_wait_cancelable64 
(futex_word=futex_word@entry=0x769852a16630, expected=expected@entry=0, 
clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at 
./nptl/futex-internal.c:139
   #3  0x000076985a09b7ed in __pthread_cond_wait_common (abstime=0x0, 
clockid=0, mutex=0x769852a16678, cond=0x769852a16608) at 
./nptl/pthread_cond_wait.c:503
   #4  ___pthread_cond_wait (cond=0x769852a16608, mutex=0x769852a16678) at 
./nptl/pthread_cond_wait.c:627
   #5  0x00007698545f1793 in background_thread_entry () from 
/home/antoine/t/venv-3.12/lib/python3.12/site-packages/pyarrow/libarrow.so.2100
   #6  0x000076985a09caa4 in start_thread (arg=<optimized out>) at 
./nptl/pthread_create.c:447
   #7  0x000076985a129c3c in clone3 () at 
../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
   ```


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