[sr-dev] [kamailio/kamailio] Crash in dns_cache.c with use_dns_cache=off (Issue #3350)

27 Jan 2023

With Kamailio 5.6.3 I add this code

```diff

 -- Routing to foreign domains
 function ksr_route_sipout()
+        local y = KSR.enum.enum_query()
+        KSR.err('ENUM RESULT ' .. tostring(y) .. ' :RURI ' ..
KSR.kx.get_ruri() .. '\n')

         if KSR.is_myself_ruri() then return 1; end

         KSR.hdr.append("P-Hint: outbound\r\n");
```
and dial +437200101011 .  The code above produces the output “ENUM RESULT 1 :RURI
sip:enum-test@sip.nemox.net”.

I have the DNS-related settings:
```
dns_try_naptr=on
use_dns_cache=off
dns_cache_init=off
```

Kamailio logs during the dial-in process:
```sip
INVITE sip:+437200101011@sip.example.org SIP/2.0
Via: SIP/2.0/UDP 192.168.0.199:40867;rport;branch=z9hG4bKU2Fc14H2NX4Kc
Max-Forwards: 70
From: <sip:myself@sip.example.org>;tag=vmjX7H12KrH1B
To: <sip:+437200101011@sip.example.org>
Call-ID: 8956e785-1905-123c-24bb-e4aaeae9dd8b
CSeq: 62865320 INVITE
Contact: <sip:myself@sip.example.org>
User-Agent: calls sofia-sip/1.13.12
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER,
UPDATE
Supported: timer, 100rel, replaces, gruu, outbound
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 240

v=0
o=- 9163509233734166984 5909793187606445082 IN IP4 192.168.0.199
s=-
c=IN IP4 22.222.222.222
t=0 0
m=audio 43264 RTP/AVP 9 8 0 3
a=rtpmap:9 G722/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtcp:33730

 6(7) ERROR: <core> [core/kemi.c:96]: sr_kemi_core_err(): ksr_sipdump_event
1--------- sipdump:msg
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP
192.168.0.199:40867;rport=40867;branch=z9hG4bKU2Fc14H2NX4Kc;received=22.222.222.222
From: <sip:myself@sip.example.org>;tag=vmjX7H12KrH1B
To:
<sip:+437200101011@sip.example.org>;tag=44af9dbde0a62ae84f5c1ff272adb901.20dd651d
Call-ID: 8956e785-1905-123c-24bb-e4aaeae9dd8b
CSeq: 62865320 INVITE
Proxy-Authenticate: Digest realm="example.int",
nonce="Y9QB/GPUANBJum6LTOLsDnjaSLKc/8o1A1zk1oUtFXzlFe/OfiMEAg=="
Content-Length: 0

 8(9) ERROR: <core> [core/kemi.c:96]: sr_kemi_core_err(): ksr_sipdump_event
1--------- sipdump:msg
ACK sip:+437200101011@sip.example.org SIP/2.0
Via: SIP/2.0/UDP 192.168.0.199:40867;rport;branch=z9hG4bKU2Fc14H2NX4Kc
Max-Forwards: 70
From: <sip:myself@sip.example.org>;tag=vmjX7H12KrH1B
To:
<sip:+437200101011@sip.example.org>;tag=44af9dbde0a62ae84f5c1ff272adb901.20dd651d
Call-ID: 8956e785-1905-123c-24bb-e4aaeae9dd8b
CSeq: 62865320 ACK
Content-Length: 0

 5(6) ERROR: <core> [core/kemi.c:96]: sr_kemi_core_err(): ksr_sipdump_event
1--------- sipdump:msg
INVITE sip:+437200101011@sip.example.org SIP/2.0
Via: SIP/2.0/UDP 192.168.0.199:40867;rport;branch=z9hG4bKvB942Z25j6t6Q
Max-Forwards: 70
From: <sip:myself@sip.example.org>;tag=vmjX7H12KrH1B
To: <sip:+437200101011@sip.example.org>
Call-ID: 8956e785-1905-123c-24bb-e4aaeae9dd8b
CSeq: 62865321 INVITE
Contact: <sip:myself@sip.example.org>
User-Agent: calls sofia-sip/1.13.12
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER,
UPDATE
Supported: timer, 100rel, replaces, gruu, outbound
Proxy-Authorization: Digest username="myself", realm="example.int",
nonce="Y9QB/GPUANBJum6LTOLsDnjaSLKc/8o1A1zk1oUtFXzlFe/OfiMEAg==", algorithm=MD5,
uri="sip:+437200101011@sip.example.org",
response="da2f40487bb63329105222dab911d9bd"
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 240

v=0
o=- 9163509233734166984 5909793187606445082 IN IP4 192.168.0.199
s=-
c=IN IP4 22.222.222.222
t=0 0
m=audio 43264 RTP/AVP 9 8 0 3
a=rtpmap:9 G722/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtcp:33730

 5(6) ERROR: <core> [core/kemi.c:96]: sr_kemi_core_err(): ENUM RESULT 1 :RURI
sip:enum-test@sip.nemox.net
 5(6) ERROR: <core> [core/kemi.c:96]: sr_kemi_core_err(): ksr_sipdump_event
1--------- sipdump:msg
SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP
192.168.0.199:40867;rport=40867;branch=z9hG4bKvB942Z25j6t6Q;received=22.222.222.222
From: <sip:myself@sip.example.org>;tag=vmjX7H12KrH1B
To: <sip:+437200101011@sip.example.org>
Call-ID: 8956e785-1905-123c-24bb-e4aaeae9dd8b
CSeq: 62865321 INVITE
Authentication-Info:
nextnonce="Y9QB/GPUANBJum6LTOLsDnjaSLKc/8o1A1zk1oUtFXzlFe/OfiMEAg==", qop=,
rspauth="d9dd065ba472cbc3f8cc4505dbd2ad60", cnonce="", nc=
Content-Length: 0

 0(1) ALERT: <core> [main.c:774]: handle_sigs(): child process 6 exited by a signal
11
24(25) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 13
 0(1) ALERT: <core> [main.c:777]: handle_sigs(): core was generated
```

The full backtrace is:
```
#0  0x00000000004867e5 in atomic_cmpxchg_int (var=0x0, old=0, new_v=1) at
core/mem/../atomic/atomic_x86.h:224
        ret = 32663
#1  0x0000000000486831 in futex_get (lock=0x0) at core/mem/../futexlock.h:99
        v = 0
        i = 1024
#2  0x0000000000490ce5 in dns_hash_get (name=0x7ffe2446dbc0, type=33, h=0x7ffe2446da90,
err=0x7ffe2446da7c) at core/dns_cache.c:673
        e = 0x0
#3  0x00000000004972a7 in dns_get_entry (name=0x7ffe2446dbc0, type=33) at
core/dns_cache.c:2001
        h = 608623712
        e = 0x0
        cname_val = {
          s = 0x0,
          len = 5860299
        }
        err = 32766
        rec_cnt = 1
        __func__ = "dns_get_entry"
#4  0x0000000000499289 in dns_srv_get_he (name=0x7ffe2446dbc0, port=0x7ffe2446df1c,
flags=0) at core/dns_cache.c:2455
        e = 0x2
        rr = 0x0
        rr_name = {
          s = 0xa3e33d203 <error: Cannot access memory at address 0xa3e33d203>,
          len = 1043567768
        }
        he = 0x0
        now = 611930531
        rr_no = 0 '\000'
#5  0x0000000000597aae in no_naptr_srv_sip_resolvehost (name=0x7ffe2446e100,
port=0x7ffe2446df1c, proto=0x7f973a751788 "\001") at core/resolve.c:1599
        srv_proto_list = {{
            proto = 1 '\001',
            proto_pref = 30
          }, {
            proto = 2 '\002',
            proto_pref = 20
          }, {
            proto = 4 '\004',
            proto_pref = 20
          }, {
            proto = 3 '\003',
            proto_pref = 10
          }, {
            proto = 0 '\000',
            proto_pref = 0
          }, {
            proto = 13 '\r',
            proto_pref = 1
          }, {
            proto = 80 'P',
            proto_pref = 319
          }}
        he = 0x0
        ip = 0x0
        srv_name = {
          s = 0x929320 <tmp_srv> "_sip._udp.sip.nemox.net",
          len = 23
        }
        tmp_srv = "_sip._udp.sip.nemox.net", '\000' <repeats 232
times>
        i = 0
        list_len = 4
        __func__ = "no_naptr_srv_sip_resolvehost"
#6  0x0000000000598333 in naptr_sip_resolvehost (name=0x7ffe2446e100, port=0x7ffe2446df1c,
proto=0x7f973a751788 "\001") at core/resolve.c:1675
        he = 0x0
        ip = 0x0
        tmp = "sip.nemox.net", '\000' <repeats 242 times>
        l = 0x0
        naptr_head = 0x0
        n_proto = 0 '\000'
        srv_name = {
          s = 0x7f97390fee12 <sr_kemi_lua_exec_func_514>
"UH\211\345H\203\354\020H\211}\370H\213E\370\276\002\002",
          len = 1051642410
        }
        tried_bmp = 0
        origproto = 0 '\000'
        __func__ = "naptr_sip_resolvehost"
#7  0x00000000005983c6 in _sip_resolvehost (name=0x7ffe2446e100, port=0x7ffe2446df1c,
proto=0x7f973a751788 "\001") at core/resolve.c:1707
        res = 0x0
#8  0x000000000049943c in dns_srv_sip_resolvehost (name=0x7ffe2446e100,
port=0x7ffe2446df1c, proto=0x7f973a751788 "\001") at core/dns_cache.c:2516
        he = 0x7f9739119c91 <luaD_callnoyield+449>
        ip = 0x7f97390fca97 <sr_kemi_lua_exec_func_221>
        tmp = '\000' <repeats 255 times>
        srv_name = {
          s = 0x1a67740 "\020h\247\001",
          len = 0
        }
        srv_proto = 0 '\000'
        __func__ = "dns_srv_sip_resolvehost"
#9  0x000000000049b3de in dns_sip_resolvehost (name=0x7ffe2446e100, port=0x7ffe2446df1c,
proto=0x7f973a751788 "\001") at core/dns_cache.c:2738
No locals.
#10 0x000000000059846b in sip_hostport2su (su=0x7f973a751700, name=0x7ffe2446e100,
port=5060, proto=0x7f973a751788 "\001") at core/resolve.c:1727
        he = 0x7f973e33d2be
        __func__ = "sip_hostport2su"
#11 0x00007f9739efdff0 in uri2dst2 (dns_h=0x7f973a751888, dst=0x7f973a7516f8,
force_send_socket=0x0, sflags=..., uri=0x7f973e3390d0, proto=0) at
/git/voip/kamailio/src/modules/tm/ut.h:308
        parsed_uri = {
          user = {
            s = 0x7f973e33d2b4 &quot;enum-test(a)sip.nemox.net&quot;.net",
            len = 9
          },
          passwd = {
            s = 0x0,
            len = 0
          },
          host = {
            s = 0x7f973e33d2be "sip.nemox.net",
            len = 13
          },
          port = {
            s = 0x0,
            len = 0
          },
          params = {
            s = 0x0,
            len = 0
          },
          sip_params = {
            s = 0x0,
            len = 0
          },
          headers = {
            s = 0x0,
            len = 0
          },
          port_no = 0,
          proto = 0,
          type = SIP_URI_T,
          flags = 0,
          transport = {
            s = 0x0,
            len = 0
          },
          ttl = {
            s = 0x0,
            len = 0
          },
          user_param = {
            s = 0x0,
            len = 0
          },
          maddr = {
            s = 0x0,
            len = 0
          },
          method = {
            s = 0x0,
            len = 0
          },
          lr = {
            s = 0x0,
            len = 0
          },
          r2 = {
            s = 0x0,
            len = 0
          },
          gr = {
            s = 0x0,
            len = 0
          },
          transport_val = {
            s = 0x0,
            len = 0
          },
          ttl_val = {
            s = 0x0,
            len = 0
          },
          user_param_val = {
            s = 0x0,
            len = 0
          },
          maddr_val = {
            s = 0x0,
            len = 0
          },
          method_val = {
            s = 0x0,
            len = 0
          },
          lr_val = {
            s = 0x0,
            len = 0
          },
          r2_val = {
            s = 0x0,
            len = 0
          },
          gr_val = {
            s = 0x0,
            len = 0
          }
        }
        uri_proto = PROTO_NONE
        host = 0x7ffe2446e100
        ip_found = 0
        to = {
          s = {
            sa_family = 57744,
            sa_data = "F$\376\177\000\000\211\216\0169\227\177\000"
          },
          sin = {
            sin_family = 57744,
            sin_port = 9286,
            sin_addr = {
              s_addr = 32766
            },
            sin_zero = "\211\216\0169\227\177\000"
          },
          sin6 = {
            sin6_family = 57744,
            sin6_port = 9286,
            sin6_flowinfo = 32766,
            sin6_addr = {
              __in6_u = {
                __u6_addr8 =
"\211\216\0169\227\177\000\000\001\000\000\000\000\000\000",
                __u6_addr16 = {36489, 14606, 32663, 0, 1, 0, 0, 0},
                __u6_addr32 = {957255305, 32663, 1, 0}
              }
            },
            sin6_scope_id = 1042640912
          },
          sas = {
            ss_family = 57744,
            __ss_padding =
"F$\376\177\000\000\211\216\0169\227\177\000\000\001\000\000\000\000\000\000\000\020p%>\227\177\000\000\260\340F$\376\177\000\000\304\311K",
'\000' <repeats 37 times>,
"\020;\v:\227\177\000\000\360\2153>\227\177\000\000Px\246\001\000\000\000\000\230\2243>\227\177\000\000\002\000\000\000\000\000\000",
            __ss_align = 27947488
          }
        }
        err = 32766
        __func__ = "uri2dst2"
#12 0x00007f9739f00878 in prepare_new_uac (t=0x7f973a751408, i_req=0x7f973e338df0,
branch=0, uri=0x7ffe2446e490, path=0x7ffe2446e470, next_hop=0x7f973e3390d0, fsocket=0x0,
snd_flags=..., fproto=0, flags=2, instance=0x7ffe2446e460, ruid=0x7ffe2446e450,
location_ua=0x7ffe2446e440) at t_fwd.c:447
        shbuf = 0x0
        add_rm_backup = 0x7f973e33b288
        body_lumps_backup = 0x0
        parsed_uri_bak = {
          user = {
            s = 0x7f973e33a634 &quot;enum-test(a)sip.nemox.net&quot;.net",
            len = 9
          },
          passwd = {
            s = 0x0,
            len = 0
          },
          host = {
            s = 0x7f973e33a63e "sip.nemox.net",
            len = 13
          },
          port = {
            s = 0x0,
            len = 0
          },
          params = {
            s = 0x0,
            len = 0
          },
          sip_params = {
            s = 0x0,
            len = 0
          },
          headers = {
            s = 0x0,
            len = 0
          },
          port_no = 0,
          proto = 0,
          type = SIP_URI_T,
          flags = 0,
          transport = {
            s = 0x0,
            len = 0
          },
          ttl = {
            s = 0x0,
            len = 0
          },
          user_param = {
            s = 0x0,
            len = 0
          },
          maddr = {
            s = 0x0,
            len = 0
          },
          method = {
            s = 0x0,
            len = 0
          },
          lr = {
            s = 0x0,
            len = 0
          },
          r2 = {
            s = 0x0,
            len = 0
          },
          gr = {
            s = 0x0,
            len = 0
          },
          transport_val = {
            s = 0x0,
            len = 0
          },
          ttl_val = {
            s = 0x0,
            len = 0
          },
          user_param_val = {
            s = 0x0,
            len = 0
          },
          maddr_val = {
            s = 0x0,
            len = 0
          },
          method_val = {
            s = 0x0,
            len = 0
          },
          lr_val = {
            s = 0x0,
            len = 0
          },
          r2_val = {
            s = 0x0,
            len = 0
          },
          gr_val = {
            s = 0x0,
            len = 0
          }
        }
        ret = -1
        len = 32663
        parsed_uri_ok_bak = 1
        free_new_uri = 1
        msg_uri_bak = {
          s = 0x7f973e33a630 "sip:enum-test@sip.nemox.net",
          len = 27
        }
        dst_uri_bak = {
          s = 0x0,
          len = 0
        }
        dst_uri_backed_up = 1
        path_bak = {
          s = 0x0,
          len = 0
        }
        free_path = 1
        instance_bak = {
          s = 0x0,
          len = 0
        }
        free_instance = 1
        ruid_bak = {
          s = 0x0,
          len = 0
        }
        free_ruid = 1
        ua_bak = {
          s = 0x0,
          len = 0
        }
        free_ua = 1
        backup_route_type = 1
        test_dst = 23
        fwd_snd_flags_bak = {
          f = 0,
          blst_imask = 0
        }
        rpl_snd_flags_bak = {
          f = 1,
          blst_imask = 0
        }
        force_send_socket_bak = 0x0
        dst = 0x7f973a7516f8
        ctx = {
          rec_lev = 0,
          run_flags = 0,
          last_retcode = 0,
          jmp_env = {{
              __jmpbuf = {140729507046528, 107383054981, 140729507046336, 7983668,
140729507046712, 140729507046688, 0, 0},
              __mask_was_saved = 0,
              __saved_mask = {
                __val = {0, 0, 0, 0, 1016, 2510101137099545603, 12909040900923746448,
140729507046448, 7983053, 3689621524717335394, 0, 140729507046488, 140729507046688, 8,
8872581, 4179003179399}
              }
            }}
        }
        bctx = 0x0
        keng = 0x913440 <_sr_kemi_eng_list>
        __func__ = "prepare_new_uac"
#13 0x00007f9739f058f0 in add_uac (t=0x7f973a751408, request=0x7f973e338df0,
uri=0x7f973e3390d0, next_hop=0x7f973e3390d0, path=0x7f973e339498, proxy=0x0, fsocket=0x0,
snd_flags=..., proto=0, flags=2, instance=0x7f973e3394a8, ruid=0x7f973e3394c0,
location_ua=0x7f973e3394d0) at t_fwd.c:814
        ret = 0
        branch = 0
        __func__ = "add_uac"
#14 0x00007f9739f0f73f in t_forward_nonack (t=0x7f973a751408, p_msg=0x7f973e338df0,
proxy=0x0, proto=0) at t_fwd.c:1694
        branch_ret = 0
        lowest_ret = -1
        added_branches = 0
        first_branch = 0
        i = 32766
        t_invite = 0x7f973e33c570
        success_branch = 608627136
        try_new = 1
        lock_replies = 939792
        backup_bflags = 0
        obranch = {
          uri = {
            s = 0x1f600000000 <error: Cannot access memory at address
0x1f600000000>,
            len = 27594632
          },
          dst_uri = {
            s = 0x1 <error: Cannot access memory at address 0x1>,
            len = 27947488
          },
          q = 27687040,
          path = {
            s = 0x7f97390fca97 <sr_kemi_lua_exec_func_221>
"UH\211\345H\203\354\020H\211}\370H\213E\370\276", <incomplete sequence
\335>,
            len = 608627072
          },
          flags = 972537629,
          force_socket = 0x1,
          ruid = {
            s = 0x7ffe2446e950 "",
            len = 608627120
          },
          instance = {
            s = 0x6400000001 <error: Cannot access memory at address
0x6400000001>,
            len = 1043566064
          },
          location_ua = {
            s = 0x7f973a751408 "p\344\032:\227\177",
            len = 8388608
          },
          otcpid = 7449488
        }
        __func__ = "t_forward_nonack"
#15 0x00007f9739ef6bc5 in t_relay_to (p_msg=0x7f973e338df0, proxy=0x0, proto=0,
replicate=0) at t_funcs.c:332
        ret = 0
        new_tran = 1
        t = 0x7f973a751408
        dst = {
          send_sock = 0x7ffe2446eb80,
          to = {
            s = {
              sa_family = 50040,
              sa_data = "3>\227\177\000\000\000\000\000\000\000\000\000"
            },
            sin = {
              sin_family = 50040,
              sin_port = 15923,
              sin_addr = {
                s_addr = 32663
              },
              sin_zero = "\000\000\000\000\000\000\000"
            },
            sin6 = {
              sin6_family = 50040,
              sin6_port = 15923,
              sin6_flowinfo = 32663,
              sin6_addr = {
                __in6_u = {
                  __u6_addr8 =
"\000\000\000\000\000\000\000\000\020p%>\227\177\000",
                  __u6_addr16 = {0, 0, 0, 0, 28688, 15909, 32663, 0},
                  __u6_addr32 = {0, 0, 1042640912, 32663}
                }
              },
              sin6_scope_id = 27687040
            },
            sas = {
              ss_family = 50040,
              __ss_padding =
"3>\227\177\000\000\000\000\000\000\000\000\000\000\020p%>\227\177\000\000\200x\246\001\000\000\000\000\320\377\377\377\377\377\377\377\000\000\000\000\000\000\000\000\300c\252\001\000\000\000\000\200x\246\001\000\000\000\000\360\273\0179\227\177\000\000\200\353F$\376\177\000\000\257\363G\000\000\000\000\000\000\000\000\000S\003\000\000\360\2153>\227\177",
'\000' <repeats 14 times>, "\022\000\000",
              __ss_align = 140287560368784
            }
          },
          id = 1043579664,
          send_flags = {
            f = 32663,
            blst_imask = 0
          },
          proto = 0 '\000',
          proto_pad0 = 0 '\000',
          proto_pad1 = 0
        }
        port = 0
        host = {
          s = 0x0,
          len = 1043579608
        }
        comp = 0
        __func__ = "t_relay_to"
#16 0x00007f9739f48a33 in _w_t_relay_to (p_msg=0x7f973e338df0, proxy=0x0, force_proto=0)
at tm.c:1764
        t = 0x7ffe2446ec30
        res = 3
        __func__ = "_w_t_relay_to"
#17 0x00007f9739f51dec in ki_t_relay (msg=0x7f973e338df0) at tm.c:2917
No locals.
#18 0x00007f97390eb94c in sr_kemi_lua_exec_func_ex (L=0x1a50f88, ket=0x7f9739ff5be0
<tm_kemi_exports>, pdelta=0) at app_lua_api.c:1022
        i = 1
        argc = 0
        ret = 1
        fname = 0x7f9739ff5bf0 <tm_kemi_exports+16>
        mname = 0x7f9739ff5be0 <tm_kemi_exports>
        vps = {{
            n = 27739704,
            s = {
              s = 0x1a74638 "ksr_failure_manage",
              len = 18
            }
          }, {
            n = 0,
            s = {
              s = 0x0,
              len = 0
            }
          }, {
            n = 0,
            s = {
              s = 0x0,
              len = 0
            }
          }, {
            n = 0,
            s = {
              s = 0x0,
              len = 0
            }
          }, {
            n = 0,
            s = {
              s = 0x0,
              len = 0
            }
          }, {
            n = 0,
            s = {
              s = 0x0,
              len = 0
            }
          }}
        env_L = 0x7f9739175a00 <_sr_L_env>
        xret = 0x7f973a047580 <_sr_kemi_kx_xval>
        __func__ = "sr_kemi_lua_exec_func_ex"
#19 0x00007f97390f337e in sr_kemi_lua_exec_func (L=0x1a50f88, eidx=221) at
app_lua_api.c:1706
        ket = 0x7f9739ff5be0 <tm_kemi_exports>
        ret = 1
        tvb = {
          tv_sec = 0,
          tv_usec = 0
        }
        tve = {
          tv_sec = 0,
          tv_usec = 0
        }
        tz = {
          tz_minuteswest = 1052892288,
          tz_dsttime = 32663
        }
        tdiff = 27594832
        dinfo = {
          event = 1043568344,
          name = 0x7f973e339980 <incomplete sequence \350>,
          namewhat = 0x7ffe2446f03e "",
          what = 0x3000000018 <error: Cannot access memory at address
0x3000000018>,
          source = 0x7ffe2446efa0 "\200x\246\001",
          srclen = 140729507049184,
          currentline = 8989040,
          linedefined = 0,
          lastlinedefined = 73,
          nups = 0 '\000',
          nparams = 0 '\000',
          isvararg = 0 '\000',
          istailcall = 0 '\000',
          ftransfer = 4176,
          ntransfer = 421,
          short_src =
"\000\000\000\000\004\000\000\000\000\000\000\000I\000\000\000\000\000\000\000\204\275\256>\227\177\000\000\300\a\000\000\000\000\000\000@\000\000\000\000\000\000\000\005\000\000\000\000\000\000\000P\020\245\001\000\000\000",
          i_ci = 0x1a50f88
        }
        __func__ = "sr_kemi_lua_exec_func"
#20 0x00007f97390fcab4 in sr_kemi_lua_exec_func_221 (L=0x1a50f88) at
app_lua_kemi_export.c:1813
No locals.
#21 0x00007f97391193c1 in luaD_precall () from
/var/lib/containers/storage/overlay/1ba9d537e5be2b3a47b220bd68cdb6646cd0a1f4ebb83a234c8bcc2324ca5f3f/merged/lib64/kamailio/modules/app_lua.so
No symbol table info available.
#22 0x00007f973912d4cb in luaV_execute () from
/var/lib/containers/storage/overlay/1ba9d537e5be2b3a47b220bd68cdb6646cd0a1f4ebb83a234c8bcc2324ca5f3f/merged/lib64/kamailio/modules/app_lua.so
No symbol table info available.
#23 0x00007f9739119c91 in luaD_callnoyield () from
/var/lib/containers/storage/overlay/1ba9d537e5be2b3a47b220bd68cdb6646cd0a1f4ebb83a234c8bcc2324ca5f3f/merged/lib64/kamailio/modules/app_lua.so
No symbol table info available.
#24 0x00007f973911802a in luaD_rawrunprotected () from
/var/lib/containers/storage/overlay/1ba9d537e5be2b3a47b220bd68cdb6646cd0a1f4ebb83a234c8bcc2324ca5f3f/merged/lib64/kamailio/modules/app_lua.so
No symbol table info available.
#25 0x00007f973911a1e0 in luaD_pcall () from
/var/lib/containers/storage/overlay/1ba9d537e5be2b3a47b220bd68cdb6646cd0a1f4ebb83a234c8bcc2324ca5f3f/merged/lib64/kamailio/modules/app_lua.so
No symbol table info available.
#26 0x00007f97391143df in lua_pcallk () from
/var/lib/containers/storage/overlay/1ba9d537e5be2b3a47b220bd68cdb6646cd0a1f4ebb83a234c8bcc2324ca5f3f/merged/lib64/kamailio/modules/app_lua.so
No symbol table info available.
#27 0x00007f97390e7f0d in app_lua_run_ex (msg=0x7f973e338df0, func=0x7f973914d598
"ksr_request_route", p1=0x0, p2=0x0, p3=0x0, emode=1) at app_lua_api.c:773
        n = 0
        ret = 0
        txt = {
          s = 0x7ffe2446f520 "\020\370F$\376\177",
          len = 5783320
        }
        bmsg = 0x0
        ltop = 36
        __func__ = "app_lua_run_ex"
#28 0x00007f9739106f07 in sr_kemi_config_engine_lua (msg=0x7f973e338df0, rtype=1,
rname=0x0, rparam=0x0) at app_lua_mod.c:119
        ret = -1
        __func__ = "sr_kemi_config_engine_lua"
#29 0x00000000005048bf in sr_kemi_route (keng=0x913440 <_sr_kemi_eng_list>,
msg=0x7f973e338df0, rtype=1, ename=0x0, edata=0x0) at core/kemi.c:3784
        sfbk = 0
        ret = 1054122048
#30 0x000000000058890a in receive_msg (buf=0x9b22a0 <buf> "INVITE
sip:+437200101011@sip.example.org SIP/2.0\r\nVia: SIP/2.0/UDP
192.168.0.199:40867;TH=div;rport;branch=z9hG4bKvB942Z25j6t6Q\r\nMax-Forwards: 69\r\nFrom:
<sip:myself@sip.example.org>;tag=vmjX7H12KrH1B\r\nTo:
<sip:+437200101011@sip.example.org>\r\nCall-ID:
8956e785-1905-123c-24bb-e4aaeae9dd8b\r\nCSeq: 62865321 INVITE\r\nContact:
<sip:myself@sip.example.org>\r\nUser-Agent: calls sofia-sip/1.13.12\r\nAllow:
INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER,
UPDATE\r\nSupported: timer, 100rel, replaces, gruu, outbound\r\nProxy-Authorization:
Digest username=\"myself\", realm=\"example.int\",
nonce=\"Y9QB/GPUANBJum6LTOLsDnjaSLKc/8o1A1zk1oUtFXzlFe/OfiMEAg==\",
algorithm=MD5, uri=\"sip:+437200101011@sip.example.org\",
response=\"da2f40487bb63329105222dab911d9bd\"\r\nContent-Type:
application/sdp\r\nContent-Disposition: session\r\nContent-Length: 240\r\nTH:
dih\r\n\r\nv=0\r\no=- 9163509233734166984 5909793187606445082 IN IP4
192.168.0.199\r\ns=-\r\nc=IN IP4 22.222.222.222\r\nt=0 0\r\nm=audio 43264 RTP/AVP 9 8 0
3\r\na=rtpmap:9 G722/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:3
GSM/8000\r\na=rtcp:33730\r\n", len=1093, rcv_info=0x7ffe2446fae0) at
core/receive.c:502
        msg = 0x7f973e338df0
        ctx = {
          rec_lev = 256,
          run_flags = 16777216,
          last_retcode = 0,
          jmp_env = {{
              __jmpbuf = {1099511627776, 512, 0, 0, 0, 0, 0, 0},
              __mask_was_saved = 0,
              __saved_mask = {
                __val = {0, 0, 0, 0, 0, 0, 0, 4294967296, 1225543208507932942, 33554432,
3298534883584, 72057594037928192, 72057594037927936, 1099511627776, 512, 0}
              }
            }}
        }
        bctx = 0x0
        ret = 0
        tvb = {
          tv_sec = 0,
          tv_usec = 0
        }
        tve = {
          tv_sec = 0,
          tv_usec = 0
        }
        diff = 0
        inb = {
          s = 0x9b22a0 <buf> "INVITE sip:+437200101011@sip.example.org
SIP/2.0\r\nVia: SIP/2.0/UDP
192.168.0.199:40867;TH=div;rport;branch=z9hG4bKvB942Z25j6t6Q\r\nMax-Forwards: 69\r\nFrom:
<sip:myself@sip.example.org>;tag=vmjX7H12KrH1B\r\nTo:
<sip:+437200101011@sip.example.org>\r\nCall-ID:
8956e785-1905-123c-24bb-e4aaeae9dd8b\r\nCSeq: 62865321 INVITE\r\nContact:
<sip:myself@sip.example.org>\r\nUser-Agent: calls sofia-sip/1.13.12\r\nAllow:
INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER,
UPDATE\r\nSupported: timer, 100rel, replaces, gruu, outbound\r\nProxy-Authorization:
Digest username=\"myself\", realm=\"example.int\",
nonce=\"Y9QB/GPUANBJum6LTOLsDnjaSLKc/8o1A1zk1oUtFXzlFe/OfiMEAg==\",
algorithm=MD5, uri=\"sip:+437200101011@sip.example.org\",
response=\"da2f40487bb63329105222dab911d9bd\"\r\nContent-Type:
application/sdp\r\nContent-Disposition: session\r\nContent-Length: 240\r\nTH:
dih\r\n\r\nv=0\r\no=- 9163509233734166984 5909793187606445082 IN IP4
192.168.0.199\r\ns=-\r\nc=IN IP4 22.222.222.222\r\nt=0 0\r\nm=audio 43264 RTP/AVP 9 8 0
3\r\na=rtpmap:9 G722/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:3
GSM/8000\r\na=rtcp:33730\r\n",
          len = 1093
        }
        netinfo = {
          data = {
            s = 0x0,
            len = 0
          },
          bufsize = 0,
          rcv = 0x0,
          dst = 0x0
        }
        keng = 0x913440 <_sr_kemi_eng_list>
        evp = {
          data = 0x7ffe2446f630,
          obuf = {
            s = 0x0,
            len = 0
          },
          rcv = 0x7ffe2446fae0,
          dst = 0x0,
          req = 0x0,
          rpl = 0x0,
          rplcode = 0,
          mode = 0
        }
        cidlockidx = 0
        cidlockset = 0
        errsipmsg = 0
        exectime = 0
        __func__ = "receive_msg"
#31 0x00000000006cad81 in udp_rcv_loop () at core/udp_server.c:544
        len = 1077
        buf = "INVITE sip:+437200101011@sip.example.org SIP/2.0\r\nVia: SIP/2.0/UDP
192.168.0.199:40867;TH=div;rport;branch=z9hG4bKvB942Z25j6t6Q\r\nMax-Forwards: 69\r\nFrom:
<sip:myself@sip.example.org>;tag=vmjX7H12KrH1B\r\nTo:
<sip:+437200101011@sip.example.org>\r\nCall-ID:
8956e785-1905-123c-24bb-e4aaeae9dd8b\r\nCSeq: 62865321 INVITE\r\nContact:
<sip:myself@sip.example.org>\r\nUser-Agent: calls sofia-sip/1.13.12\r\nAllow:
INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER,
UPDATE\r\nSupported: timer, 100rel, replaces, gruu, outbound\r\nProxy-Authorization:
Digest username=\"myself\", realm=\"example.int\",
nonce=\"Y9QB/GPUANBJum6LTOLsDnjaSLKc/8o1A1zk1oUtFXzlFe/OfiMEAg==\",
algorithm=MD5, uri=\"sip:+437200101011@sip.example.org\",
response=\"da2f40487bb63329105222dab911d9bd\"\r\nContent-Type:
application/sdp\r\nContent-Disposition: session\r\nContent-Length: 240\r\nTH:
dih\r\n\r\nv=0\r\no=- 9163509233734166984 5909793187606445082 IN IP4
192.168.0.199\r\ns=-\r\nc=IN IP4 22.222.222.222\r\nt=0 0\r\nm=audio 43264 RTP/AVP 9 8 0
3\r\na=rtpmap:9 G722/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:3
GSM/8000\r\na=rtcp:33730\r\n", '\000' <repeats 64442 times>
        tmp = 0x13a3d9090 <error: Cannot access memory at address 0x13a3d9090>
        fromaddr = 0x7f973e338ba8
        fromaddrlen = 16
        rcvi = {
          src_ip = {
            af = 2,
            len = 4,
            u = {
              addrl = {2576512599, 0},
              addr32 = {2576512599, 0, 0, 0},
              addr16 = {30295, 39314, 0, 0, 0, 0, 0, 0},
              addr = "Wv\222\231", '\000' <repeats 11 times>
            }
          },
          dst_ip = {
            af = 2,
            len = 4,
            u = {
              addrl = {1317948560, 0},
              addr32 = {1317948560, 0, 0, 0},
              addr16 = {19600, 20110, 0, 0, 0, 0, 0, 0},
              addr = "\220L\216N", '\000' <repeats 11 times>
            }
          },
          src_port = 40867,
          dst_port = 5060,
          proto_reserved1 = 0,
          proto_reserved2 = 0,
          src_su = {
            s = {
              sa_family = 2,
              sa_data = "\237\243Wv\222\231\000\000\000\000\000\000\000"
            },
            sin = {
              sin_family = 2,
              sin_port = 41887,
              sin_addr = {
                s_addr = 2576512599
              },
              sin_zero = "\000\000\000\000\000\000\000"
            },
            sin6 = {
              sin6_family = 2,
              sin6_port = 41887,
              sin6_flowinfo = 2576512599,
              sin6_addr = {
                __in6_u = {
                  __u6_addr8 = '\000' <repeats 15 times>,
                  __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0},
                  __u6_addr32 = {0, 0, 0, 0}
                }
              },
              sin6_scope_id = 0
            },
            sas = {
              ss_family = 2,
              __ss_padding = "\237\243Wv\222\231", '\000' <repeats
111 times>,
              __ss_align = 0
            }
          },
          bind_address = 0x7f973e2e7768,
          rflags = 0,
          proto = 1 '\001',
          proto_pad0 = 0 '\000',
          proto_pad1 = 0
        }
        evp = {
          data = 0x0,
          obuf = {
            s = 0x0,
            len = 0
          },
          rcv = 0x0,
          dst = 0x0,
          req = 0x0,
          rpl = 0x0,
          rplcode = 0,
          mode = 0
        }
        printbuf =
"\000\000\000\000\000\000\000\000\270\003G$\376\177\000\000\370\235\216\000\000\000\000\000@\240\324>\227\177\000\000\340\370F$\376\177\000\000D\204\0209\227\177\000\000\370\235\216\000\000\000\000\000@\240\324>\005\000\000\000\260\371F$\376\177\000\000\263\372b",
'\000' <repeats 57 times>, "\005\000\000\000P\2210>\227\177",
'\000' <repeats 90 times>,
"\274\202=:\227\177\000\000\000\000\000\000\004\000\000\000\260-\205\000\000\000\000\000\370\235\216\000\000\000\000\000@\240\324>\005\000\000\000\200\372F$\376\177\000\000\263\372b",
'\000' <repeats 13 times>,
"0^\235\000\000\000\000\000\000^\235\000\000\000\000\000\230g\235\000\000\000\000\000K\306[\302!\307S\354\230\"7(ɘR\354\263ƚ\316\005\000\000\000\350\2260>\227\177\000\000
^\235\000\000\000\000\000\230g\235\000\000\000\000\000\031\216\n\274\001\000\000\000@h\235\000\000\000\000\000P\372F$\376\177\000\000\240h\235\000\000\000\000\000\240g\235\000\000\000\000\000\000^\235\000\000\000\000\000p\372F$\376\177\000\000\235\275y\000\000\000\000\000p\372F$\376\177\000\000\274\202=:\227\177\000\000\000\000\000\000\000\000\000\000\270\003G$\376\177\000\000\370\235\216\000\000\000\000\000@\240\324>\227\177\000\0000\373F$\376\177\000\000\250\002c\000\000\000\000\000\320\372F$\376\177\000\000\213\305y\000\000\000\000"
        i = -1
        j = 41600
        l = 5
        __func__ = "udp_rcv_loop"
#32 0x000000000042d3af in main_loop () at main.c:1722
        i = 4
        pid = 0
        si = 0x7f973e2e7768
        si_desc = "udp receiver child=4
sock=111.11.111.11:5060\000\000d\000p\375F$\376\177\000\000\000\000\000\000\000\000\000\000\200\375F$\376\177\000\000s\300\3229\227\177\000\000\020\376F$\376\177\000\000\v\006\3239\227\177\000\000`\375F$\376\177\000\0001\rp\000\000\000\000\000\320/\203\000\000\000\000\000\001\000\000\000k\000\000"
        nrprocs = 8
        woneinit = 1
        __func__ = "main_loop"
#33 0x00000000004390be in main (argc=3, argv=0x7ffe24470398) at main.c:3078
        cfg_stream = 0x1931380
        c = -1
        r = 0
        tmp = 0x0
        tmp_len = 0
        port = 0
        proto = 0
        ahost = 0x0
        aport = 0
        options = 0x8081f8
":f:cm:M:dVIhEeb:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:"
        ret = -1
        seed = 3092184453
        rfd = 4
        debug_save = 0
        debug_flag = 0
        dont_fork_cnt = 2
        n_lst = 0x0
        p = 0x0
        st = {
          st_dev = 65025,
          st_ino = 3424267,
          st_nlink = 3,
          st_mode = 16895,
          st_uid = 65534,
          st_gid = 65534,
          __pad0 = 0,
          st_rdev = 0,
          st_size = 4096,
          st_blksize = 4096,
          st_blocks = 8,
          st_atim = {
            tv_sec = 1674835346,
            tv_nsec = 294486590
          },
          st_mtim = {
            tv_sec = 1674837962,
            tv_nsec = 574996365
          },
          st_ctim = {
            tv_sec = 1674837962,
            tv_nsec = 574996365
          },
          __glibc_reserved = {0, 0, 0}
        }
        tbuf = "D\377F$\376\177", '\000' <repeats 18 times>,
"hq\247>\227\177\000\000\200\374\245>\227\177\000\000\020\000G$\376\177\000\000\b\000G$\376\177\000\000W\301\000\000\000\000\000\000``\321>\227\177\000\000\005",
'\000' <repeats 23 times>,
"\210\266\324>\227\177\000\000\000p\321>\227\177\000\000\342z\321>\227\177\000\000f\024\322>\227\177\000\000\260إ>",
'\000' <repeats 12 times>,
"\260Z\321>\227\177\000\0008^\321>\227\177\000\000\344U0\000\000\000\000\000hq\247>\227\177\000\000\220\000G$\376\177\000\000\b\000G$\376\177\000\000\340h\321>\227\177\000\000/\v\322>\227\177\000\000\004\000\000\000\000\000\000\000\340h\321>\227\177\000\000\001",
'\000' <repeats 15 times>,
"\001\000\000\000\000\000\000\000\260Z\321>\227\177\000\000\260Z\321>\227\177\000\000\001\000\000\000\003\000\000\000\020\000G$\376\177\000\0008^\321>\227\177\000\000\000\000\000\000\000\000\000\000\001",
'\000' <repeats 16 times>,
"\037G$\376\177\000\000\001\261\324>\227\177\000\000\377\377\377\377\000\000\000\000\330w\321>\227\177\000\000\360\252\324>\227\177\000\0006\027g\n3@\022\000\000\263\324>\227\177\000\000\306\363v\n3@\022\000\005",
'\000' <repeats 15 times>,
"\260Z\321>\227\177\000\000\017\000\000\000\000\000\000\000\300\321\301>\227\177\000\000\270\003G$\376\177\000\000\370\235\216\000\000\000\000\000@\240\324>\227\177\000\000^n\322>\227\177\000\000\001",
'\000' <repeats 15 times>,
"\330w\321>\227\177\000\000\340\326\322>\227\177\000\000\000\000\000\000\000\000\000\000\020\003G$\376\177\000\000\003",
'\000' <repeats 14 times>
        option_index = 0
        long_options = {{
            name = 0x80a91f "help",
            has_arg = 0,
            flag = 0x0,
            val = 104
          }, {
            name = 0x8054cc "version",
            has_arg = 0,
            flag = 0x0,
            val = 118
          }, {
            name = 0x80a924 "alias",
            has_arg = 1,
            flag = 0x0,
            val = 1024
          }, {
            name = 0x80a92a "subst",
            has_arg = 1,
            flag = 0x0,
            val = 1025
          }, {
            name = 0x80a930 "substdef",
            has_arg = 1,
            flag = 0x0,
            val = 1026
          }, {
            name = 0x80a939 "substdefs",
            has_arg = 1,
            flag = 0x0,
            val = 1027
          }, {
            name = 0x80a943 "server-id",
            has_arg = 1,
            flag = 0x0,
            val = 1028
          }, {
            name = 0x80a94d "loadmodule",
            has_arg = 1,
            flag = 0x0,
            val = 1029
          }, {
            name = 0x80a958 "modparam",
            has_arg = 1,
            flag = 0x0,
            val = 1030
          }, {
            name = 0x80a961 "log-engine",
            has_arg = 1,
            flag = 0x0,
            val = 1031
          }, {
            name = 0x80a96c "debug",
            has_arg = 1,
            flag = 0x0,
            val = 1032
          }, {
            name = 0x80a972 "cfg-print",
            has_arg = 0,
            flag = 0x0,
            val = 1033
          }, {
            name = 0x80a97c "atexit",
            has_arg = 1,
            flag = 0x0,
            val = 1034
          }, {
            name = 0x0,
            has_arg = 0,
            flag = 0x0,
            val = 0
          }}
        __func__ = "main"
quit
```

111.11.111.11 is the IP address of the server. 22.222.222.222 is my public IP address.
192.168.0.199 is my address behind NAT.

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[sr-dev] [kamailio/kamailio] Crash in dns_cache.c with use_dns_cache=off (Issue #3350)