tsearle created an issue (kamailio/kamailio#4153)

### Description

I use kemi python on arm64. The script is working in 5.8.4 but hangs when running on 6.0.0

#### Trobuleshooting

I reverted the patch https://github.com/kamailio/kamailio/pull/3986

and fully removed the code ref KafkaProducer and calls worked

If I use stock 6.0.0, even if I remove KafkaProducer calls still don't work

#### Reproduction

I have a kemi python script that uses the python module "KafkaProducer" which seems to create threads in the background. I also use the kamailio http_async module and an another async worker pool

#### Debugging Data

``` ---start 1558 ----------------------------------------------------- [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1". __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0xffffd25f2d00, op=137, expected=0, futex_word=0xffff8df076d0 <_PyRuntime+432>) at ./nptl/futex-internal.c:57 57 ./nptl/futex-internal.c: No such file or directory. #0 __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0xffffd25f2d00, op=137, expected=0, futex_word=0xffff8df076d0 <_PyRuntime+432>) at ./nptl/futex-internal.c:57 _x3tmp = 281474211196160 _x0tmp = 281473063089872 _x0 = 281473063089872 _x3 = 281474211196160 _x4tmp = 0 _x1tmp = -1068905079 _x1 = 137 _x4 = 0 _x5tmp = 4294967295 _x2tmp = 0 _x2 = 0 _x5 = 4294967295 _x8 = 98 _sys_result = <optimized out> sc_ret = <optimized out> _sys_result = <optimized out> _x5tmp = <optimized out> _x4tmp = <optimized out> _x3tmp = <optimized out> _x2tmp = <optimized out> _x1tmp = <optimized out> _x0tmp = <optimized out> _x0 = <optimized out> _x1 = <optimized out> _x2 = <optimized out> _x3 = <optimized out> _x4 = <optimized out> _x5 = <optimized out> _x8 = <optimized out> #1 __futex_abstimed_wait_common (cancel=true, private=0, abstime=0xffffd25f2d00, clockid=-473937460, expected=0, futex_word=0xffff8df076d0 <_PyRuntime+432>) at ./nptl/futex-internal.c:87 err = <optimized out> clockbit = 3226062080 op = 137 err = <optimized out> clockbit = <optimized out> op = <optimized out> #2 __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff8df076d0 <_PyRuntime+432>, expected=expected@entry=0, clockid=clockid@entry=1, abstime=abstime@entry=0xffffd25f2d00, private=private@entry=0) at ./nptl/futex-internal.c:139 No locals. #3 0x0000ffff90ede520 in __pthread_cond_wait_common (abstime=0xffffd25f2d00, clockid=1, mutex=0xffff8df076d8 <_PyRuntime+440>, cond=0xffff8df076a8 <_PyRuntime+392>) at ./nptl/pthread_cond_wait.c:503 spin = 0 buffer = {__routine = 0xffff90eddf74 <__condvar_cleanup_waiting>, __arg = 0xffffd25f2c38, __canceltype = -471327168, __prev = 0x0} cbuffer = {wseq = 9322, cond = 0xffff8df076a8 <_PyRuntime+392>, mutex = 0xffff8df076d8 <_PyRuntime+440>, private = 0} err = <optimized out> g = 0 flags = <optimized out> g1_start = <optimized out> maxspin = 0 signals = <optimized out> result = 0 wseq = 9322 seq = 4661 private = 0 maxspin = <optimized out> err = <optimized out> result = <optimized out> wseq = <optimized out> g = <optimized out> seq = <optimized out> flags = <optimized out> private = <optimized out> signals = <optimized out> done = <optimized out> g1_start = <optimized out> spin = <optimized out> buffer = <optimized out> cbuffer = <optimized out> s = <optimized out> #4 ___pthread_cond_timedwait64 (cond=0xffff8df076a8 <_PyRuntime+392>, mutex=0xffff8df076d8 <_PyRuntime+440>, abstime=0xffffd25f2d00) at ./nptl/pthread_cond_wait.c:643 flags = <optimized out> clockid = 1 #5 0x0000ffff8da3f538 in ?? () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available. #6 0x0000ffff8da3fa28 in PyEval_RestoreThread () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available.``` #7 0x0000ffff8df99658 in apy_exec (_msg=0xffff857912f0, fname=0xaaaae3e8fda8 "ksr_onsend_route", fparam=fparam@entry=0x0, emode=emode@entry=0) at ./src/modules/app_python3/python_exec.c:75 pFunc = <optimized out> pArgs = <optimized out> pValue = <optimized out> pResult = <optimized out> pmsg = <optimized out> rval = -1 bmsg = <optimized out> locked = 0 __func__ = "apy_exec" #8 0x0000ffff8df90c00 in sr_kemi_config_engine_python (msg=<optimized out>, rtype=16, rname=0x0, rparam=<optimized out>) at ./src/modules/app_python3/apy_kemi.c:92 ret = -1 __func__ = "sr_kemi_config_engine_python" #9 0x0000aaaae3bcb578 in sr_kemi_route (keng=keng@entry=0xaaaae3f7f8e0 <_sr_kemi_eng_list>, msg=msg@entry=0xffff857912f0, rtype=rtype@entry=16, ename=ename@entry=0x0, edata=edata@entry=0x0) at core/kemi.c:3853 sfbk = 0 ret = <optimized out> #10 0x0000aaaae3c09c0c in run_onsend (orig_msg=orig_msg@entry=0xffff857912f0, dst=dst@entry=0xffff8578c6d0, buf=0xffff85792f00 "INVITE sip:+32485112970@54.220.60.194:5060;transport=UDP SIP/2.0\r\nRecord-Route: sip:10.151.1.119;lr=on;did=f84.06f1\r\nRecord-Route: sip:10.151.0.41:5080;r2=on;lr=on\r\nRecord-Route: <sip:176.34.141.1"..., len=<optimized out>) at core/onsend.c:79 onsnd_info = {dst = 0x0, to = 0xffff8578c6d8, send_sock = 0xffff8ffe89e0, buf = 0xffff85792f00 "INVITE sip:+32485112970@54.220.60.194:5060;transport=UDP SIP/2.0\r\nRecord-Route: sip:10.151.1.119;lr=on;did=f84.06f1\r\nRecord-Route: sip:10.151.0.41:5080;r2=on;lr=on\r\nRecord-Route: <sip:176.34.141.1"..., len = 1384, msg = 0xffff857912f0, rmode = 0, rplcode = 0} ret = 1 ra_ctx = {rec_lev = 0, run_flags = 0, last_retcode = 0, jmp_env = {{__jmpbuf = {0, 0, 0, 0, 0, 0, 91, 187650945063344, 187650945067504, 180, 187650944742872, 187650946646016, 1, 281473098000061, 281474211197472, 187650942363668, 281474211197752, 187650945867776, 187650944901120, 281473098000432, 3122766361, 187650944902184}, __mask_was_saved = -471386664, __saved_mask = {__val = {281473098000456, 187650944893376, 2074081191309474304, 281474211197424, 187650943506496, 275, 0, 281472882816896, 281473098000557, 281470681743367, 34, 187650945064960, 187650944741376, 2, 187650945730496, 281474211197472}}}}} bctx = 0x0 backup_route_type = 2 fwd_snd_flags_bak = <optimized out> rpl_snd_flags_bak = <optimized out> keng = <optimized out> __func__ = "run_onsend" #11 0x0000ffff8f75bacc in t_send_branch (t=t@entry=0xffff8578be90, branch=branch@entry=2, p_msg=p_msg@entry=0xffff857912f0, proxy=proxy@entry=0x0, lock_replies=lock_replies@entry=0) at ./src/modules/tm/t_fwd.c:1499 ip = {af = 3529455232, len = 65535, u = {addrl = {187650945761776, 281474211197776}, addr32 = {3824599536, 43690, 3529454416, 65535}, addr16 = {49648, 58358, 43690, 0, 13136, 53855, 65535, 0}, addr = "\360\301\366㪪\000\000P3_\322\377\377\000"}} ret = 2 uac = 0xffff8578c670 __func__ = "t_send_branch" #12 0x0000ffff8f75de14 in t_forward_nonack (t=0xffff8578be90, p_msg=p_msg@entry=0xffff857912f0, proxy=0x0, proto=proto@entry=0) at ./src/modules/tm/t_fwd.c:1786 branch_ret = <optimized out> lowest_ret = <optimized out> added_branches = 4 first_branch = <optimized out> i = 2 t_invite = <optimized out> success_branch = 0 try_new = <optimized out> lock_replies = 0 backup_bflags = 0 obranch = {uri = {s = 0x0, len = 0}, dst_uri = {s = 0x0, len = 0}, q = -1, path = {s = 0x0, len = 0}, flags = 0, force_socket = 0x0, ruid = {s = 0x0, len = 0}, instance = {s = 0x0, len = 0}, location_ua = {s = 0x0, len = 0}, otcpid = 0} __func__ = "t_forward_nonack" #13 0x0000ffff8f7bc41c in _w_t_relay_to (p_msg=0xffff857912f0, proxy=<optimized out>, force_proto=0) at ./src/modules/tm/tm.c:1856 t = <optimized out> res = <optimized out> __func__ = "_w_t_relay_to" #14 0x0000ffff8df91814 in sr_apy_kemi_exec_func_ex (ket=0xffff8f821420 <tm_kemi_exports>, self=<optimized out>, args=0xffff8df15b48 <_PyRuntime+58920>, idx=<optimized out>) at ./src/modules/app_python3/apy_kemi.c:259 fname = {s = 0xffff8f7f6b08 "t_relay", len = 7} i = <optimized out> ret = <optimized out> vps = {{vtype = -1919318472, v = {n = -2062635920, l = 281472914074736, s = {s = 0xffff850eac70 "\003", len = -2062643520}, dict = 0xffff850eac70}}, {vtype = 0, v = {n = -2062621248, l = 281472914089408, s = {s = 0xffff850ee5c0 ";", len = -765511240}, dict = 0xffff850ee5c0}}, {vtype = 0, v = {n = -1914684912, l = 281473062025744, s = {s = 0xffff8de03a10 <PyModule_Type> "*", len = 0}, dict = 0xffff8de03a10 <PyModule_Type>}}, {vtype = 7, v = {n = -1861393856, l = 281473115316800, s = {s = 0xffff910d6240 "\200xN\203\377\377", len = -1914684912}, dict = 0xffff910d6240}}, {vtype = -2062643520, v = {n = -765511888, l = 281474211198768, s = {s = 0xffffd25f3730 "\2607_\322\377\377", len = 1}, dict = 0xffffd25f3730}}, {vtype = -1914655368, v = {n = -765511896, l = 281474211198760, s = {s = 0xffffd25f3728 "\020\346\016\205\377\377", len = -765511888}, dict = 0xffffd25f3728}}} env_P = <optimized out> lmsg = 0xffff857912f0 xret = <optimized out> slen = 841693253507731862 alen = <optimized out> pobj = <optimized out> __func__ = "sr_apy_kemi_exec_func_ex" #15 0x0000ffff8df93440 in sr_apy_kemi_exec_func (self=0xffff850ee5c0, args=0xffff8df15b48 <_PyRuntime+58920>, idx=118) at ./src/modules/app_python3/apy_kemi.c:358 ket = 0xffff8f821420 <tm_kemi_exports> ret = 0x0 pstate = 0x0 pframe = 0x0 pcode = 0x0 tvb = {tv_sec = 0, tv_usec = 0} tve = {tv_sec = 0, tv_usec = 0} tz = {tz_minuteswest = -765511584, tz_dsttime = 65535} tdiff = <optimized out> __func__ = "sr_apy_kemi_exec_func" #16 0x0000ffff8d9a5d88 in ?? () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available. #17 0x0000ffff8d9571d8 in _PyObject_MakeTpCall () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available. #18 0x0000ffff8d8ed03c in _PyEval_EvalFrameDefault () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available. #19 0x0000ffff8da440fc in ?? () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available. #20 0x0000ffff8d95a728 in ?? () from /lib/aarch64-linux-gnu/libpython3.11.so.1.0 No symbol table info available. #21 0x0000ffff8df99924 in apy_exec (_msg=<optimized out>, fname=0xffff85797110 "ksr_rtpengine_http_action", fparam=fparam@entry=0x0, emode=emode@entry=1) at ./src/modules/app_python3/python_exec.c:149 pFunc = 0xffff84f7c180 pArgs = 0xffff85075150 pValue = <optimized out> pResult = <optimized out> pmsg = 0xffff83509e10 rval = -1 bmsg = 0x0 locked = 0 __func__ = "apy_exec" #22 0x0000ffff8df90770 in sr_kemi_config_engine_python (msg=<optimized out>, rtype=2, rname=0xffffd25f3f18, rparam=<optimized out>) at ./src/modules/app_python3/apy_kemi.c:88 ret = -1 __func__ = "sr_kemi_config_engine_python" #23 0x0000aaaae3bcb578 in sr_kemi_route (keng=0xaaaae3f7f8e0 <_sr_kemi_eng_list>, msg=msg@entry=0xffff857912f0, rtype=rtype@entry=2, ename=ename@entry=0xffffd25f3f18, edata=edata@entry=0xffffd25f3e38) at core/kemi.c:3853 sfbk = 0 ret = <optimized out> #24 0x0000ffff8f7ac5c0 in t_continue_helper (hash_index=<optimized out>, label=<optimized out>, rtact=<optimized out>, cbname=<optimized out>, cbparam=0xffffd25f3f28, skip_timer=<optimized out>) at ./src/modules/tm/t_suspend.c:319 t = 0xffff8578be90 backup_T = 0xffffffffffffffff backup_T_branch = -1 faked_req = 0xffff857912f0 brpl = 0x0 erpl = 0x0 faked_req_len = 7064 cancel_data = {cancel_bitmap = 3823579136, reason = {cause = 18336, u = {text = {s = 0xffffd25f40a0 "", len = -765509856}, e2e_cancel = 0xffffd25f40a0, packed_hdrs = {s = 0xffffd25f40a0 "", len = -765509856}}}} branch = 1 uac = <optimized out> ret = <optimized out> cb_type = 2 msg_status = <optimized out> last_uac_status = <optimized out> reply_status = <optimized out> do_put_on_wait = <optimized out> hdr = <optimized out> prev = 0x0 tmp = 0x0 route_type_bk = 2 keng = <optimized out> evname = {s = 0xffff8e0915d8 "async:task-exec", len = 15} __func__ = "t_continue_helper" #25 0x0000ffff8e08a93c in async_exec_task (param=0xffff85797100) at ./src/modules/async/async_sleep.c:392 atp = 0xffff85797100 keng = <optimized out> cbname = {s = 0xffff85797110 "ksr_rtpengine_http_action", len = 25} evname = {s = 0xffff8e0915d8 "async:task-exec", len = 15} __func__ = "async_exec_task" #26 0x0000aaaae3b45a6c in async_task_run (awg=awg@entry=0xffff90020d00, idx=idx@entry=1) at core/async_task.c:523 ptask = 0xffff857970f0 received = <optimized out> __func__ = "async_task_run" #27 0x0000aaaae3b46814 in async_task_child_init (rank=rank@entry=0) at core/async_task.c:225 pid = <optimized out> i = 0 pname = "Async Task Worker - rtpengine\000\000\000$\267\262㪪\000\000 B_\322\377\377\000\000\b\362\313㪪\000\000\000\220\366㪪\000" awg = 0xffff90020d00 __func__ = "async_task_child_init" __llevel = <optimized out> __kld = <optimized out> #28 0x0000aaaae3cbf2f8 in init_child (rank=rank@entry=0) at core/sr_module.c:995 ret = <optimized out> type = <optimized out> __func__ = "init_child" #29 0x0000aaaae3b2cfc0 in main_loop () at ./src/main.c:2022 i = <optimized out> pid = <optimized out> si = <optimized out> sx = <optimized out> si_desc = "udp receiver child=3 sock=10.151.1.119:5090\000\377\377\000\000`}\004\220\377\377\000\000\250\310\360%\210&\f7\023\000\000\000\000\000\000\0000\000\000\000\000\000\000\000(\000\000\000\000\000\000\000\240D_\322\377\377\000\000\030\340\261㪪\000\000\3305\347㪪\000\000\240E_\322\377\377\000\000\344D\270㪪\000" nrprocs = <optimized out> woneinit = 1 agfound = <optimized out> __func__ = "main_loop" error = <optimized out> #30 0x0000aaaae3b1e030 in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.c:3406 cfg_stream = <optimized out> c = <optimized out> r = <optimized out> tmp = 0xffffd25f4e5d "" tmp_len = 65535 port = 5060 proto = 0 aproto = 0 ahost = 0x0 socket_name = 0x0 aport = 0 listen_field_count = <optimized out> listen_fields = {0x0, 0x0, 0x0} options = 0xaaaae3e75ea0 ":f:cm:M:dVIhEeb:B:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:" ret = -1 seed = 379075458 rfd = <optimized out> debug_save = <optimized out> debug_flag = <optimized out> dont_fork_cnt = <optimized out> n_lst = <optimized out> p = <optimized out> tbuf = 0xffff910ed028 <_rtld_global> "\200\343\016\221\377\377" tbuf_tmp = <optimized out> st = {st_dev = 24, st_ino = 1050, st_mode = 16888, st_nlink = 2, st_uid = 106, st_gid = 111, st_rdev = 0, __pad1 = 0, st_size = 40, st_blksize = 4096, __pad2 = 0, st_blocks = 0, st_atim = {tv_sec = 1740037653, tv_nsec = 298823983}, st_mtim = {tv_sec = 1740037653, tv_nsec = 298823983}, st_ctim = {tv_sec = 1740037653, tv_nsec = 298823983}, __glibc_reserved = {0, 0}} l1 = <optimized out> lim = {rlim_cur = 1024, rlim_max = 524288} option_index = 9 long_options = {{name = 0xaaaae3e77a28 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0xaaaae3e77a30 "version", has_arg = 0, flag = 0x0, val = 118}, {name = 0xaaaae3e8fba8 "alias", has_arg = 1, flag = 0x0, val = 1024}, {name = 0xaaaae3e77a38 "subst", has_arg = 1, flag = 0x0, val = 1025}, {name = 0xaaaae3e77a40 "substdef", has_arg = 1, flag = 0x0, val = 1026}, {name = 0xaaaae3e77a50 "substdefs", has_arg = 1, flag = 0x0, val = 1027}, {name = 0xaaaae3e77a60 "server-id", has_arg = 1, flag = 0x0, val = 1028}, {name = 0xaaaae3e77a70 "loadmodule", has_arg = 1, flag = 0x0, val = 1029}, {name = 0xaaaae3e77a80 "modparam", has_arg = 1, flag = 0x0, val = 1030}, {name = 0xaaaae3e77a90 "log-engine", has_arg = 1, flag = 0x0, val = 1031}, {name = 0xaaaae3e77aa0 "debug", has_arg = 1, flag = 0x0, val = 1032}, {name = 0xaaaae3e77aa8 "cfg-print", has_arg = 0, flag = 0x0, val = 1033}, {name = 0xaaaae3e77ab8 "atexit", has_arg = 1, flag = 0x0, val = 1034}, {name = 0xaaaae3e77ac0 "all-errors", has_arg = 0, flag = 0x0, val = 1035}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} __func__ = "main"

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 6.0.0 (aarch64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT-NOSMP, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 12.2.0 ```

* **Operating System**:

``` No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 12 (bookworm) Release: 12 Codename: bookworm

Linux #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux ```