Using kamailio-dbg:

Reading symbols from /usr/sbin/kamailio...Reading symbols from /usr/lib/debug/.build-id/fe/4d6c322f76df685bbec9adafde99fc43c0bc6a.debug...done.
done.
[New LWP 11891]
[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/sbin/kamailio -f /etc/kamailio/kamailio.cfg'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f226e50760a in t_continue (hash_index=1984, label=122428216, route=0x7f2270bb15f0) at t_suspend.c:411
411 t_suspend.c: No such file or directory.
(gdb) bt full
#0 0x00007f226e50760a in t_continue (hash_index=1984, label=122428216, route=0x7f2270bb15f0) at t_suspend.c:411
t = 0x7f2262786938
faked_req = 0x7f226e4763a1 <t_lookup_ident+962>
faked_req_len = 0
cancel_data = {cancel_bitmap = 0, reason = {cause = 0, u = {text = {s = 0x0, len = 2}, e2e_cancel = 0x0, packed_hdrs = {s = 0x0, len = 2}}}}
branch = 0
uac = 0x0
ret = 32765
cb_type = 3
msg_status = 32765
last_uac_status = 1646426056
reply_status = 4
do_put_on_wait = 1
hdr = 0xffffffff00000011
prev = 0x0
tmp = 0x0
route_type_bk = 32546
FUNCTION = "t_continue"
#1 0x00007f226c317848 in async_http_cb (reply=0x7f22627d9d28, param=0x7f22626d16f8) at async_http.c:217
aq = 0x7f22626d16f8
act = 0x7f2270bb15f0
tindex = 1984
tlabel = 122428216
t = 0x7f2262786938
p = 0x0
newbuf = {s = 0x0, len = 0}
fmsg = 0x26c3860
FUNCTION = "async_http_cb"
#2 0x00007f226c311a72 in check_multi_info (g=0x7f22626ac5a8) at http_multi.c:573
eff_url = 0x26cd640 "https://109.68.161.209:9443/customers/cdr/"
msg = 0x26c3880
msgs_left = 0
easy = 0x26c3860
res = CURLE_OK
cell = 0x7f226279b068
FUNCTION = "check_multi_info"
#3 0x00007f226c3096a4 in event_cb (fd=11, kind=2, userp=0x26c3860) at http_multi.c:145
g = 0x7f22626ac5a8
rc = CURLM_OK
easy = 0x26c3860
cell = 0x7f226279b068
FUNCTION = "event_cb"
action = 1
#4 0x00007f226be483dc in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
No symbol table info available.
#5 0x00007f226c314c3d in async_http_run_worker (worker=0x7f2262418430) at async_http.c:86
No locals.
#6 0x00007f226c2fe86e in child_init (rank=0) at http_async_client_mod.c:367
---Type to continue, or q to quit---
pid = 0
i = 0
FUNCTION = "child_init"
#7 0x000000000053d8c2 in init_mod_child (m=0x7f2270a5d5c8, rank=0) at core/sr_module.c:921
FUNCTION = "init_mod_child"
#8 0x000000000053d5e0 in init_mod_child (m=0x7f2270a5e1e0, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#9 0x000000000053d5e0 in init_mod_child (m=0x7f2270a5e850, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#10 0x000000000053d5e0 in init_mod_child (m=0x7f2270a5edb0, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#11 0x000000000053d5e0 in init_mod_child (m=0x7f2270a5f420, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#12 0x000000000053d5e0 in init_mod_child (m=0x7f2270a5f8d0, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#13 0x000000000053d5e0 in init_mod_child (m=0x7f2270a5ffe8, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#14 0x000000000053d5e0 in init_mod_child (m=0x7f2270a60440, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#15 0x000000000053d5e0 in init_mod_child (m=0x7f2270a607e8, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#16 0x000000000053d5e0 in init_mod_child (m=0x7f2270a60b88, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#17 0x000000000053d5e0 in init_mod_child (m=0x7f2270a60fc8, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#18 0x000000000053d5e0 in init_mod_child (m=0x7f2270a61370, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#19 0x000000000053d5e0 in init_mod_child (m=0x7f2270a61780, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#20 0x000000000053d5e0 in init_mod_child (m=0x7f2270a61bc8, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#21 0x000000000053d5e0 in init_mod_child (m=0x7f2270a62380, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#22 0x000000000053d5e0 in init_mod_child (m=0x7f2270a62c00, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#23 0x000000000053d5e0 in init_mod_child (m=0x7f2270a65608, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#24 0x000000000053d5e0 in init_mod_child (m=0x7f2270a66290, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#25 0x000000000053d5e0 in init_mod_child (m=0x7f2270a66660, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#26 0x000000000053d5e0 in init_mod_child (m=0x7f2270a705d0, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#27 0x000000000053d5e0 in init_mod_child (m=0x7f2270a71ae0, rank=0) at core/sr_module.c:918
FUNCTION = "init_mod_child"
#28 0x000000000053dbf0 in init_child (rank=0) at core/sr_module.c:947
No locals.
#29 0x000000000042357c in main_loop () at main.c:1700
---Type to continue, or q to quit---
i = 4
pid = 11878
si = 0x0
si_desc = "udp receiver child=3 sock=185.165.211.54:5063\000\000\000\361\240u\000\000\000\000\000\000 \266\034$LU\250O\021\000\020\000\000\000\000a\021\230b\000\000\000\000\360xA\000\000\000\000\000\000\213\314Q\375\177", '\000' <repeats 18 times>, "\060\210\314Q\375\177\000\000\035\322^\000\000\000\000"
nrprocs = 4
woneinit = 1
FUNCTION = "main_loop"
#30 0x0000000000429f71 in main (argc=3, argv=0x7ffd51cc8b08) at main.c:2639
cfg_stream = 0x25de010
c = -1
r = 0
tmp = 0x7f22719c573d <_dl_lookup_symbol_x+349> "\203\370"
tmp_len = 1897947560
port = 32546
proto = 1372359104
options = 0x737490 ":f:cm:M:dVIhEeb:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O🅰️AX:Y:"
ret = -1
seed = 444768467
rfd = 4
debug_save = 0
debug_flag = 0
dont_fork_cnt = 0
n_lst = 0x0
p = 0x1 <error: Cannot access memory at address 0x1>
st = {st_dev = 47, st_ino = 29, st_nlink = 2, st_mode = 16877, st_uid = 104, st_gid = 110, __pad0 = 0, st_rdev = 0, st_size = 60, st_blksize = 4096, st_blocks = 0,
st_atim = {tv_sec = 1488206724, tv_nsec = 372702711}, st_mtim = {tv_sec = 1491386032, tv_nsec = 103114082}, st_ctim = {tv_sec = 1491386032, tv_nsec = 103114082},
__glibc_reserved = {0, 0, 0}}
FUNCTION = "main"
(gdb)
(gdb) info locals
t = 0x7f2262786938
faked_req = 0x7f226e4763a1 <t_lookup_ident+962>
faked_req_len = 0
cancel_data = {cancel_bitmap = 0, reason = {cause = 0, u = {text = {s = 0x0, len = 2}, e2e_cancel = 0x0, packed_hdrs = {s = 0x0, len = 2}}}}
branch = 0
uac = 0x0
ret = 32765
cb_type = 3
msg_status = 32765
last_uac_status = 1646426056
reply_status = 4
do_put_on_wait = 1
hdr = 0xffffffff00000011
prev = 0x0
tmp = 0x0
route_type_bk = 32546
FUNCTION = "t_continue"

(gdb) list
406 in t_suspend.c
(gdb)

The relevant part in the config which makes it crash is:

$http_req(all) = $null; # reset the parameters
$http_req(timeout) = 100; # 100 ms
$http_req(method) = "POST";
if ($rs=~"^[4-6][0-9][0-9]") {
$http_req(body)="{'call_id': '" + $ci + "', 'from_ip': '" + $si + "', 'event': 'notanswered','disposition': '" + $rr ";
http_async_query("https:///customers/", "HTTP_REPLY");
}
I have http_async_query as well for invite, answers, ringing, etc, those all go well, but on call 4xx, 5xx, 6xx , it segfaults.

With kamailio-dbg, we do see "411 t_suspend.c: No such file or directory."


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