### Description

Crash occurred during load test.

#### Reproduction

This cannot be reproduced at will. It happened after about 45 days of load testing.

#### Debugging Data

``` [root@lab002207-flip-server ~]$ gdb /usr/local/src/git/kamailio-5.5/src/kamailio /core GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: https://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/.

For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/local/src/git/kamailio-5.5/src/kamailio...

warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing [New LWP 189001] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/local/src/git/kamailio-5.5/src/kamailio -m 1024 -f /usr/local/etc/kamailio'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f909231e31e in atomic_get (v=0x7f96781153a0) at ../../core/mem/../atomic/atomic_common.h:66 66 return atomic_get_int(&(v->val)); (gdb) bt full #0 0x00007f909231e31e in atomic_get (v=0x7f96781153a0) at ../../core/mem/../atomic/atomic_common.h:66 No locals. #1 0x00007f909232b1a4 in dlg_ref_helper (dlg=0x7f905640bbe0, cnt=1, fname=0x7f9092368a61 "dlg_handlers.c", fline=1057) at dlg_hash.c:1074 mypid = 189001 d_entry = 0x7f9678115388 __func__ = "dlg_ref_helper" #2 0x00007f9092311fbf in dlg_set_tm_waitack (t=0x7f9053a98af8, dlg=0x7f905640bbe0) at dlg_handlers.c:1057 iuid = 0x7f905739a3c8 __func__ = "dlg_set_tm_waitack" #3 0x00007f909230c412 in dlg_onreply (t=0x7f9053a98af8, type=1048576, param=0x7ffeb3d73300) at dlg_handlers.c:578 dlg = 0x7f905640bbe0 iuid = 0x7f9055715ea0 new_state = 5 old_state = 2 unref = 1 event = 4 tag = {s = 0x80d000001ff <error: Cannot access memory at address 0x80d000001ff>, len = -1832753723} req = 0x7f90555eff70 rpl = 0xffffffffffffffff __func__ = "dlg_onreply" #4 0x00007f9092b5d399 in run_trans_callbacks_internal (cb_lst=0x7f9053a98b70, type=1048576, trans=0x7f9053a98af8, params=0x7ffeb3d73300) at t_hooks.c:258 cbp = 0x7f905362d490 backup_from = 0x555a7cfc3e90 <def_list+16> backup_to = 0x555a7cfc3e98 <def_list+24> backup_dom_from = 0x555a7cfc3ea0 <def_list+32> backup_dom_to = 0x555a7cfc3ea8 <def_list+40> backup_uri_from = 0x555a7cfc3e80 <def_list> backup_uri_to = 0x555a7cfc3e88 <def_list+8> backup_xavps = 0x555a7cfc3fd8 <_xavp_list_head> backup_xavus = 0x555a7cfc3fe0 <_xavu_list_head> backup_xavis = 0x555a7cfc3fe8 <_xavi_list_head> __func__ = "run_trans_callbacks_internal" #5 0x00007f9092b5d5b2 in run_trans_callbacks_with_buf (type=1048576, rbuf=0x7f9053a98bc8, req=0x7f90555eff70, repl=0xffffffffffffffff, flags=0) at t_hooks.c:303 params = {req = 0x7f90555eff70, rpl = 0xffffffffffffffff, param = 0x7f905362d4a0, code = 408, flags = 0, branch = 0, t_rbuf = 0x7f9053a98bc8, dst = 0x7f9053a98c18, send_buf = { s = 0x7f9054157d60 "SIP/2.0 408 Request Timeout\r\nVia: SIP/2.0/UDP 10.255.255.208:5015;rport=5015;branch=z9hG4bK-2093375-4498-18;received=192.168.2.253\r\nFrom: "the.username.for.the.user.546" <sip:the.username.for.the.user"..., len = 449}} trans = 0x7f9053a98af8 #6 0x00007f9092bd422d in relay_reply (t=0x7f9053a98af8, p_msg=0xffffffffffffffff, branch=0, msg_status=408, cancel_data=0x7ffeb3d73520, do_put_on_wait=0) at t_reply.c:2094 relay = 0 save_clone = 0 buf = 0x7f9092f17b68 "SIP/2.0 408 Request Timeout\r\nVia: SIP/2.0/UDP 10.255.255.208:5015;rport=5015;branch=z9hG4bK-2093375-4498-18;received=192.168.2.253\r\nFrom: "the.username.for.the.user.546" <sip:the.username.for.the.user"... res_len = 449 relayed_code = 408 relayed_msg = 0xffffffffffffffff reply_bak = 0x7ffeb3d734c0 bm = {to_tag_val = { s = 0x7f9092f17c88 "67946a7773289cd2c8623ce9ed050d66-614e90ad\r\nCall-ID: 4498-2093375@10.255.255.208\r\nCSeq: 802 INVITE\r\nServer: kamailio (5.5.4 (x86_64/linux))\r\nContent-Length: 0\r\n\r\n", len = 41}} totag_retr = 0 reply_status = RPS_COMPLETED uas_rb = 0x7f9053a98bc8 to_tag = 0x7f9092c3db30 <tm_tag> reason = {s = 0x555a7ce2b463 "Request Timeout", len = 15} --Type <RET> for more, q to quit, c to continue without paging--c onsend_params = {req = 0x28, rpl = 0x7f9052b1eac0, param = 0x157b82568, code = 1365092040, flags = 32656, branch = 0, t_rbuf = 0x7ffeb3d73450, dst = 0x0, send_buf = {s = 0x21d8 <error: Cannot access memory at address 0x21d8>, len = 1365092040}} ip = {af = 3017225408, len = 32766, u = {addrl = {140257839409728, 1}, addr32 = {1387391552, 32656, 1, 0}, addr16 = {59968, 21169, 32656, 0, 1, 0, 0, 0}, addr = "@\352\261R\220\177\000\000\001\000\000\000\000\000\000"}} __func__ = "relay_reply" #7 0x00007f9092b61ec0 in fake_reply (t=0x7f9053a98af8, branch=0, code=408) at timer.c:295 cancel_data = {cancel_bitmap = 0, reason = {cause = 0, u = {text = {s = 0x0, len = 1403620088}, e2e_cancel = 0x0, packed_hdrs = {s = 0x0, len = 1403620088}}}} do_cancel_branch = 1 reply_status = 189001 #8 0x00007f9092b6232e in final_response_handler (r_buf=0x7f9053a98d98, t=0x7f9053a98af8) at timer.c:462 silent = 0 branch_ret = 0 prev_branch = 0 now = 0 #9 0x00007f9092b623f2 in retr_buf_handler (ticks=2176292369, tl=0x7f9053a98db8, p=0x1f40) at timer.c:518 rbuf = 0x7f9053a98d98 fr_remainder = 0 retr_remainder = 32656 retr_interval = 1365093472 new_retr_interval_ms = 4294967296 crt_retr_interval_ms = 0 t = 0x7f9053a98af8 __func__ = "retr_buf_handler" #10 0x0000555a7ccb5a9f in timer_list_expire (t=2176292369, h=0x7f905161ed40, slow_l=0x7f905161fab8, slow_mark=5300) at core/timer.c:857 tl = 0x7f9053a98db8 ret = 0 #11 0x0000555a7ccb5fa9 in timer_handler () at core/timer.c:922 saved_ticks = 2176292369 run_slow_timer = 0 i = 180 __func__ = "timer_handler" #12 0x0000555a7ccb64ac in timer_main () at core/timer.c:961 No locals. #13 0x0000555a7c9fe6cf in main_loop () at main.c:1839 i = 12 pid = 0 si = 0x0 si_desc = "udp receiver child=11 sock=192.168.2.207:9060\000\270\000\200\070׳\376\177\000\000\000\000\000\000\000\000\000\000\220\070׳\376\177\000\000);]\221\220\177\000\000\b$Β\220\177\000\000]\201]\221\220\177", '\000' <repeats 14 times>, "\001\000\000\000\220\070׳\376\177\000\000\342\f\320|ZU\000" nrprocs = 12 woneinit = 1 __func__ = "main_loop" #14 0x0000555a7ca092ab in main (argc=8, argv=0x7ffeb3d73e78) at main.c:3053 cfg_stream = 0x555a7ea552d0 c = -1 r = 0 tmp = 0x7ffeb3d74d0a "" tmp_len = 0 port = 0 proto = 0 ahost = 0x0 aport = 0 options = 0x555a7ce150b8 ":f:cm:M:dVIhEeb:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:" ret = -1 seed = 487513963 rfd = 4 debug_save = 0 debug_flag = 0 dont_fork_cnt = 0 n_lst = 0x0 p = 0xc2 <error: Cannot access memory at address 0xc2> st = {st_dev = 22, st_ino = 2337, st_nlink = 2, st_mode = 16877, st_uid = 0, st_gid = 0, __pad0 = 0, st_rdev = 0, st_size = 60, st_blksize = 4096, st_blocks = 0, st_atim = {tv_sec = 1646805011, tv_nsec = 284331240}, st_mtim = {tv_sec = 1647223778, tv_nsec = 289750340}, st_ctim = {tv_sec = 1647223782, tv_nsec = 957818051}, __glibc_reserved = {0, 0, 0}} tbuf = "\020\377y\223\220\177\000\000\300\nG\223\001\000\000\000\377\377\377\377", '\000' <repeats 12 times>, "(\346z\223\220\177\000\000\350\231}\223\220\177\000\000\377\377\377\377", '\000' <repeats 12 times>, "@\305E\223\220\177\000\000\020\004z\223\220\177\000\000\350\244}\223\220\177\000\000\204\351z\223\220\177\000\000\060\344z\223\220\177\000\000Xbc\223\220\177\000\000h\231}\223\220\177\000\000`\220}\223\220\177\000\000\300>׳\376\177\000\000\200\241}\223\220\177\000\000\000\000\000\000\000\000\000\000#\326{\223\220\177\000\000\001", '\000' <repeats 23 times>, "(\346z\223\220\177\000\000\320<׳\376\177\000\000\003E"... option_index = 12 long_options = {{name = 0x555a7ce17516 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x555a7ce12514 "version", has_arg = 0, flag = 0x0, val = 118}, {name = 0x555a7ce1751b "alias", has_arg = 1, flag = 0x0, val = 1024}, {name = 0x555a7ce17521 "subst", has_arg = 1, flag = 0x0, val = 1025}, {name = 0x555a7ce17527 "substdef", has_arg = 1, flag = 0x0, val = 1026}, {name = 0x555a7ce17530 "substdefs", has_arg = 1, flag = 0x0, val = 1027}, {name = 0x555a7ce1753a "server-id", has_arg = 1, flag = 0x0, val = 1028}, {name = 0x555a7ce17544 "loadmodule", has_arg = 1, flag = 0x0, val = 1029}, {name = 0x555a7ce1754f "modparam", has_arg = 1, flag = 0x0, val = 1030}, {name = 0x555a7ce17558 "log-engine", has_arg = 1, flag = 0x0, val = 1031}, {name = 0x555a7ce17563 "debug", has_arg = 1, flag = 0x0, val = 1032}, {name = 0x555a7ce17569 "cfg-print", has_arg = 0, flag = 0x0, val = 1033}, {name = 0x555a7ce17573 "atexit", has_arg = 1, flag = 0x0, val = 1034}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} __func__ = "main" (gdb) info locals No locals. (gdb) list 61 62 #define atomic_set(at_var, value) (atomic_set_int(&((at_var)->val), (value))) 63 64 inline static int atomic_get(atomic_t *v) 65 { 66 return atomic_get_int(&(v->val)); 67 } 68 69 /*@} */ 70 (gdb)

```

### Additional Information

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

``` version: kamailio 5.5.4 (x86_64/linux) 54c9df flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, 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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 54c9df compiled on 10:27:27 Mar 14 2022 with gcc 10.2.1 ```

* **Operating System**:

``` [root@lab002207-flip-server ~]$ lsb_release -a uNo LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 11 (bullseye) Release: 11 Codename: bullseye

[root@lab002207-flip-server ~]$ uname -a Linux lab002207-flip-server 5.10.0-11-amd64 #1 SMP Debian 5.10.92-2 (2022-02-28) x86_64 GNU/Linux ```