jrozhon created an issue (kamailio/kamailio#4154)

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### Description

I have Kamailio configured to act as a gateway between SIP and XMPP in my lab setup. I only have module configured, no routing is implemented yet. When handshake with XMPP server (Prosody) occurs, Kamailio crashes.

### Troubleshooting

I cannot use newer version of kamailio as it crashes because of presence module. Older versions up to 5.5.7 behave the same. If i get backtrace right crash is caused by a problem with parsing the incoming xml, but it seems fine to me.

#### Reproduction

Have prosody xmpp server configured to accept component connection from kamailio.

In kamailio have xmpp.so module loaded with following parameters set:

modparam("xmpp", "backend", "component") modparam("xmpp", "gateway_domain", "kamailio-dns") modparam("xmpp", "xmpp_domain", "xmpp-dns") modparam("xmpp", "xmpp_host", "xmpp-dns") modparam("xmpp", "xmpp_port", 5347) modparam("xmpp", "xmpp_password", "shared-password")

#### Debugging Data

```

(gdb) bt full #0 _xode_put_expatattribs (owner=0x13c5480, atts=0x13be6d0) at xstream.c:35 i = 10 #1 0x00007f77df410211 in _xode_stream_startElement (xs=0x13c07f0, name=0x13c0170 "stream:stream", atts=0x13be6d0) at xstream.c:56 p = 0x13be110 #2 0x00007f77df3c2934 in doContent () from /lib64/libexpat.so.1 No symbol table info available. #3 0x00007f77df3c0fde in doProlog () from /lib64/libexpat.so.1 No symbol table info available. #4 0x00007f77df3c1eac in prologProcessor () from /lib64/libexpat.so.1 No symbol table info available. #5 0x00007f77df3b958f in callProcessor () from /lib64/libexpat.so.1 No symbol table info available. #6 0x00007f77df3c60a7 in XML_ParseBuffer () from /lib64/libexpat.so.1 No symbol table info available. #7 0x00007f77df410594 in xode_stream_eat (xs=0x13c07f0, buff=0x7f77df4185e0 <buf> "<?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:component:accept' id='09b989ba-0ba4-4b58-ad8e-53b07fe2f13a' from='sip.xmpp.osk3.lab' xml:lang='en'>", len=197) at xstream.c:176 err = 0x4000000 <error: Cannot access memory at address 0x4000000> xerr = 0x7f77e4d06ed0 <syslog> maxerr = "maximum node size reached" deeperr = "maximum node depth reached" #8 0x00007f77df404955 in xmpp_component_child_process (data_pipe=9) at xmpp_component.c:237 buf = 0x7f77df4185e0 <buf> "<?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:component:accept' id='09b989ba-0ba4-4b58-ad8e-53b07fe2f13a' from='sip.xmpp.osk3.lab' xml:lang='en'>" fd = 5 maxfd = 9 rv = 1 fdset = {__fds_bits = {32, 0 <repeats 15 times>}} pool = 0x13bae50 stream = 0x13c07f0 priv = {fd = 5, running = 1} cmd = 0xa09250 <main_state+16> __func__ = "xmpp_component_child_process" #9 0x00007f77df3fafef in xmpp_process (rank=1) at xmpp.c:280 __func__ = "xmpp_process" #10 0x00007f77df3fac4b in child_init (rank=0) at xmpp.c:263 pid = 0 #11 0x0000000000650a0c in init_mod_child (m=0x7f77e44b8f90, rank=0) at core/sr_module.c:911 ret = 0 __func__ = "init_mod_child" #12 0x0000000000650656 in init_mod_child (m=0x7f77e44b93e0, rank=0) at core/sr_module.c:903 ret = 0 __func__ = "init_mod_child" #13 0x0000000000650656 in init_mod_child (m=0x7f77e44b9b78, rank=0) at core/sr_module.c:903 ret = 0 __func__ = "init_mod_child" #14 0x0000000000650656 in init_mod_child (m=0x7f77e44ba000, rank=0) at core/sr_module.c:903 ret = 0 __func__ = "init_mod_child" #15 0x0000000000650656 in init_mod_child (m=0x7f77e44bafa0, rank=0) at core/sr_module.c:903 ret = 32 __func__ = "init_mod_child" #16 0x0000000000650656 in init_mod_child (m=0x7f77e44bb498, rank=0) at core/sr_module.c:903 ret = 0 __func__ = "init_mod_child" #17 0x0000000000650656 in init_mod_child (m=0x7f77e44bbe58, rank=0) at core/sr_module.c:903 ret = 0 __func__ = "init_mod_child" #18 0x0000000000650656 in init_mod_child (m=0x7f77e44bc370, rank=0) at core/sr_module.c:903 ret = 1 __func__ = "init_mod_child" #19 0x0000000000651207 in init_child (rank=0) at core/sr_module.c:990 ret = -464031792 type = 0x884ffb "PROC_MAIN" __func__ = "init_child" #20 0x000000000042fb48 in main_loop () at main.c:1929 i = 8 pid = 450007 si = 0x0 si_desc = "udp receiver child=7 sock=kamailio.osk3.lab:5060\000K\207\362\377\177\000\000\000\000\000\000\000\000\000\000PQ\207\362\377\177\000\000\263\266\204\000\000\000\000\0000\277K\344w\177\000\000\320n\320\344w\177\000\000\000\000\000\004\000\000\000\000jo\320\344w\177\000\0000\000\000\0000\000\000\000\bM\207\362\377\177\000" nrprocs = 8 woneinit = 1 __func__ = "main_loop" #21 0x0000000000439d03 in main (argc=11, argv=0x7ffff2875268) at main.c:3213 cfg_stream = 0x130b380 c = -1 r = 0 tmp = 0x7ffff2876ea2 "" tmp_len = 0 port = 0 proto = 0 ahost = 0x0 aport = 0 options = 0x8373a8 ":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 = 863415900 rfd = 4 debug_save = 0 debug_flag = 0 dont_fork_cnt = 2 n_lst = 0x40 p = 0x1000000 <error: Cannot access memory at address 0x1000000> st = {st_dev = 23, st_ino = 1015, st_nlink = 2, st_mode = 16832, st_uid = 977, st_gid = 976, __pad0 = 0, st_rdev = 0, st_size = 40, st_blksize = 4096, st_blocks = 0, st_atim = {tv_sec = 1739449861, tv_nsec = 919999685}, st_mtim = {tv_sec = 1740224132, tv_nsec = 607723775}, st_ctim = {tv_sec = 1740224132, tv_nsec = 607723775}, __glibc_reserved = {0, 0, 0}} tbuf = "9M\t\345w\177\000\000\210\n\006\345w\177\000\000\340N\207\362\377\177\000\000\006\000\000\000\000\000\000\000\b\367\005\345w\177\000\000\006\000\000\000\020\000\000\0000Z\t\345w\177\000\000\325\331\006\345w\177\000\000\000\000\000\000\000\000\000\000\240\354\006\345w\177\000\000\370\377\300\344w\177\000\000\000:\005\345w\177\000\000\000\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\260N\207\362\377\177\000\000\240\n\006\345w\177\000\000\240\n\006\345w\177\000\000\000\000\000\000\000\000\000\000`H\005\345w\177\000\000\260N\207\362\377\177\000\000\200e\t\345w\177\000\000\000\360\005\345w\177\000\000\342\373\005\345w\177\000\000v\244\006\345w\177\000\000\334#\300\344w\177\000\000"... option_index = 12 long_options = {{name = 0x839a46 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x8344f4 "version", has_arg = 0, flag = 0x0, val = 118}, { name = 0x839a4b "alias", has_arg = 1, flag = 0x0, val = 1024}, {name = 0x839a51 "subst", has_arg = 1, flag = 0x0, val = 1025}, {name = 0x839a57 "substdef", has_arg = 1, flag = 0x0, val = 1026}, {name = 0x839a60 "substdefs", has_arg = 1, flag = 0x0, val = 1027}, {name = 0x839a6a "server-id", has_arg = 1, flag = 0x0, val = 1028}, {name = 0x839a74 "loadmodule", has_arg = 1, flag = 0x0, val = 1029}, {name = 0x839a7f "modparam", has_arg = 1, flag = 0x0, val = 1030}, {name = 0x839a88 "log-engine", has_arg = 1, flag = 0x0, val = 1031}, {name = 0x839a93 "debug", has_arg = 1, flag = 0x0, val = 1032}, { name = 0x839a99 "cfg-print", has_arg = 0, flag = 0x0, val = 1033}, {name = 0x839aa3 "atexit", has_arg = 1, flag = 0x0, val = 1034}, { name = 0x839aaa "all-errors", has_arg = 0, flag = 0x0, val = 1035}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} __func__ = "main"

```

``` (gdb) info locals i = 10

```

``` (gdb) list 30 static void _xode_put_expatattribs(xode owner, const char **atts) 31 { 32 int i = 0; 33 if(atts == NULL) 34 return; 35 while(*(atts[i]) != '\0') { 36 xode_put_attrib(owner, atts[i], atts[i + 1]); 37 i += 2; 38 } 39 }

```

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` Feb 22 11:39:10 kamailio /usr/sbin/kamailio[445061]: INFO: tls [tls_domain.c:418]: ksr_tls_fill_missing(): TLSc<default>: verify_client=0 Feb 22 11:39:10 kamailio /usr/sbin/kamailio[445061]: INFO: tls [tls_domain.c:781]: set_verification(): TLSc<default>: Server MAY present invalid certificate Feb 22 11:39:10 kamailio /usr/sbin/kamailio[445109]: CRITICAL: <core> [core/pass_fd.c:281]: receive_fd(): EOF on 28 Feb 22 11:39:10 kamailio /usr/sbin/kamailio[445066]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 3 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445107]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 15 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445065]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 2 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445088]: INFO: ctl [io_listener.c:214]: io_listen_loop(): using epoll_lt io watch method (config) Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445070]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 4 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445064]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 1 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445074]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 7 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445076]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 8 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445096]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 9 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445085]: INFO: jsonrpcs [jsonrpcs_sock.c:471]: jsonrpc_dgram_process(): a new child 0/445085 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445072]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 6 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445108]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 16 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445061]: ALERT: <core> [main.c:792]: handle_sigs(): child process 445090 exited by a signal 11 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445061]: ALERT: <core> [main.c:796]: handle_sigs(): core was generated Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445061]: INFO: <core> [main.c:819]: handle_sigs(): terminating due to SIGCHLD Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445071]: INFO: tls [tls_mod.c:576]: mod_child(): OpenSSL loaded private keys in child: 5 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445066]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445065]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445076]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445064]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445083]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445089]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445081]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445109]: CRITICAL: <core> [core/pass_fd.c:281]: receive_fd(): EOF on 25 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445109]: CRITICAL: <core> [core/pass_fd.c:281]: receive_fd(): EOF on 17 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445109]: CRITICAL: <core> [core/pass_fd.c:281]: receive_fd(): EOF on 15 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445109]: CRITICAL: <core> [core/pass_fd.c:281]: receive_fd(): EOF on 8 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445088]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445109]: CRITICAL: <core> [core/pass_fd.c:281]: receive_fd(): EOF on 26 Feb 22 11:39:11 kamailio /usr/sbin/kamailio[445077]: INFO: <core> [main.c:875]: sig_usr(): signal 15 received ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` no sip traffic, just simple xml exchanged ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->

### Additional Information

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

``` version: kamailio 5.7.5 (x86_64/linux) 58499a 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, 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: 58499a compiled on 00:00:00 Sep 13 2022 with gcc 11.4.1 ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `lsb_release -a` and `uname -a`) -->

``` RHEL 9 Linux kamailio 5.14.0-503.15.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Nov 14 15:45:31 EST 2024 x86_64 x86_64 x86_64 GNU/Linux ```