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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. --> Kamailio segfaults possibly when trying to write to the DB when it can't.

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. --> Shutdown Kamailio when the DB is no longer connected (I see this most often with a system reboot)

#### Debugging Data

<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.

gdb /path/to/kamailio /path/to/corefile bt full info locals list

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``` Stack trace of thread 6620: #0 0x00007f8df3c54c4a get_event (pua.so) #1 0x00007f8df3c4e450 send_publish (pua.so) #2 0x00007f8df3a3c189 ul_publish (pua_usrloc.so) #3 0x00007f8df71feda0 run_ul_callbacks (usrloc.so) #4 0x00007f8df7201136 wb_timer (usrloc.so) #5 0x00007f8df720233a timer_urecord (usrloc.so) #6 0x00007f8df71fa644 mem_timer_udomain (usrloc.so) #7 0x00007f8df7225ae9 synchronize_all_udomains (usrloc.so) #8 0x00007f8df7207d18 destroy (usrloc.so) #9 0x000000000051d55e destroy_modules (kamailio) #10 0x0000000000418269 cleanup (kamailio) #11 0x00000000004199cc shutdown_children (kamailio) #12 0x000000000041a3f7 handle_sigs (kamailio) #13 0x0000000000424062 main_loop (kamailio) #14 0x0000000000429ca3 main (kamailio) #15 0x00007f8e05b8a88a __libc_start_main (libc.so.6) #16 0x000000000041795a _start (kamailio)

#0 0x00007f8df3c54c4a in get_event (ev_flag=1) at event_list.c:128 event = 0x7f8dfb007073 #1 0x00007f8df3c4e450 in send_publish (publ=0x7f8e053b8fd8) at send_publish.c:510 met = {s = 0x7f8df3ca0c62 "PUBLISH", len = 7} str_hdr = 0x0 presentity = 0x0 body = 0x0 tuple_id = 0x0 cb_param = 0x0 hash_code = 0 etag = {s = 0x0, len = 0} ver = 0 result = 500171648 ret_code = 0 ev = 0x0 uac_r = {method = 0x7f8dfe86ed88, headers = 0x7f8e05369010, body = 0x7ffd1dd002a0, ssock = 0x7f8df84a5d4f <pkg_proc_update_stats+115>, dialog = 0x7f8dffe6a138, cb_flags = 0, cb = 0x800000 <yystos+2976>, cbp = 0x524c18 <get_is_fparam+2277>, callid = 0x208250} res = 0x0 dbpres = {id = {s = 0x4 <error: Cannot access memory at address 0x4>, len = 0}, pres_uri = 0x7f8dfba03520, event = 15, expires = 0, desired_expires = 4, flag = 0, db_flag = 0, cb_param = 0x0, next = 0x0, ua_flag = 0, outbound_proxy = 0x7ffd1dd00630, etag = {s = 0x1 <error: Cannot access memory at address 0x1>, len = 0}, tuple_id = {s = 0x0, len = 7817596}, body = 0x2, content_type = {s = 0x0, len = 0}, watcher_uri = 0xffffffffffffffff, call_id = {s = 0x59f2890c <error: Cannot access memory at address 0x59f2890c>, len = 500172592}, to_tag = {s = 0x0, len = 0}, from_tag = {s = 0x1 <error: Cannot access memory at address 0x1>, len = 96725184}, cseq = 4, version = 0, extra_headers = 0x7f8e05c3e8c0 <__libc_wait+32>, record_route = {s = 0x0, len = 0}, remote_contact = {s = 0x4 <error: Cannot access memory at address 0x4>, len = 0}, contact = { s = 0x7f8dffe6a14a "Yealink SIP-T48G 35.81.0.25", len = 6659449}} pres_uri = {s = 0x0, len = 0} watcher_uri = {s = 0x0, len = 0} extra_headers = {s = 0x0, len = 0} ret = -1 __func__ = "send_publish" #2 0x00007f8df3a3c189 in ul_publish (c=0x7f8dff996470, type=8, param=0x0) at ul_publish.c:324 body = 0x0 uri = {s = 0x7f8e054e5d68 "sip:user@example.com", len = 25} at = 0x7f8dfe937d78 "@example.com.0" publ = 0x7f8e053b8fd8 size = 192 content_type = {s = 0x7f8df3a4007c "application/pidf+xml", len = 20} error = 3097352 __func__ = "ul_publish" #3 0x00007f8df71feda0 in run_ul_callbacks (type=8, c=0x7f8dff996470) at ul_callback.h:85 cbp = 0x7f8dfba02d50 __func__ = "run_ul_callbacks" #4 0x00007f8df7201136 in wb_timer (_r=0x7f8dff74f340) at urecord.c:382 ptr = 0x7f8dff996470 t = 0x208150 old_state = (unknown: 5393688) op = 0 res = 0 __func__ = "wb_timer" #5 0x00007f8df720233a in timer_urecord (_r=0x7f8dff74f340) at urecord.c:461 No locals. #6 0x00007f8df71fa644 in mem_timer_udomain (_d=0x7f8dfbad5088, istart=0, istep=1) at udomain.c:1015 ptr = 0x7f8dff74f340 t = 0x7f8df6919048 i = 20 #7 0x00007f8df7225ae9 in synchronize_all_udomains (istart=0, istep=1) at dlist.c:761 res = 0 ptr = 0x7f8dfbacd920 #8 0x00007f8df7207d18 in destroy () at usrloc_mod.c:442 __func__ = "destroy" #9 0x000000000051d55e in destroy_modules () at core/sr_module.c:811 t = 0x7f8e053d38c0 foo = 0x7f8e053d33b0 __func__ = "destroy_modules" #10 0x0000000000418269 in cleanup (show_status=1) at main.c:525 memlog = 0 __func__ = "cleanup" #11 0x00000000004199cc in shutdown_children (sig=15, show_status=1) at main.c:667 __func__ = "shutdown_children" #12 0x000000000041a3f7 in handle_sigs () at main.c:698 chld = 4292094 chld_status = 5363279 any_chld_stopped = 0 memlog = -1 __func__ = "handle_sigs" #13 0x0000000000424062 in main_loop () at main.c:1756 i = 2 pid = 6639 si = 0x0 si_desc = "udp receiver child=1 sock=[2603:300A:134:50E0:0:0:0:3]:5060\000\000\000\000\000\220\b\320\035\375\177\000\000hBc\005\216\177\000\000\020\t\320\035\375\177\000\000\252\360\017\005\216\177\000\000ȉc\005\216\177\000\000\000\000\000\000\001\000\000\000HnN\005\216\177\000\000(9\255\373\215\177\000" nrprocs = 2 woneinit = 1 __func__ = "main_loop" #14 0x0000000000429ca3 in main (argc=6, argv=0x7ffd1dd00bc8) at main.c:2643 cfg_stream = 0x1ce0010 c = -1 r = 0 tmp = 0x7ffd1dd01f06 "" tmp_len = 0 port = 0 proto = 0 options = 0x72e440 ":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 = 2969426471 rfd = 4 debug_save = 0 debug_flag = 0 dont_fork_cnt = 2 n_lst = 0x7f8e065858d0 p = 0x7ffd1dd00a20 "\377\377\377\377" st = {st_dev = 22, st_ino = 3045, st_nlink = 2, st_mode = 16872, st_uid = 986, st_gid = 983, __pad0 = 0, st_rdev = 0, st_size = 40, st_blksize = 4096, st_blocks = 0, st_atim = {tv_sec = 1508981501, tv_nsec = 204171040}, st_mtim = {tv_sec = 1509020740, tv_nsec = 222461911}, st_ctim = {tv_sec = 1509020740, tv_nsec = 222461911}, __glibc_reserved = {0, 0, 0}} __func__ = "main"

info locals cfg_stream = 0x1ce0010 c = -1 r = 0 tmp = 0x7ffd1dd01f06 "" tmp_len = 0 port = 0 proto = 0 options = 0x72e440 ":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 = 2969426471 rfd = 4 debug_save = 0 debug_flag = 0 dont_fork_cnt = 2 n_lst = 0x7f8e065858d0 p = 0x7ffd1dd00a20 "\377\377\377\377" st = {st_dev = 22, st_ino = 3045, st_nlink = 2, st_mode = 16872, st_uid = 986, st_gid = 983, __pad0 = 0, st_rdev = 0, st_size = 40, st_blksize = 4096, st_blocks = 0, st_atim = {tv_sec = 1508981501, tv_nsec = 204171040}, st_mtim = { tv_sec = 1509020740, tv_nsec = 222461911}, st_ctim = {tv_sec = 1509020740, tv_nsec = 222461911}, __glibc_reserved = {0, 0, 0}} __func__ = "main" (gdb) list 123 pua_event_t* event; 124 event= pua_evlist->next; 125 126 while(event) 127 { 128 if(event->ev_flag== ev_flag) 129 { 130 return event; 131 } 132 event= event->next; ```

#### 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). -->

``` systemd[1]: Stopping Kamailio SIP Server... kamailio[6620]: WARNING: db_postgres [km_dbase.c:242]: db_postgres_submit_query(): postgres query command failed, connection status 1, error [SSL connection has been closed unexpectedly] systemd[1]: kamailio.service: Main process exited, code=dumped, status=11/SEGV ```

#### 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). -->

``` (paste your sip traffic here) ```

### Possible Solutions

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

### Additional Information The version is the 5.0.4 release, though it happened in previous releases as well. * **Kamailio Version** -

``` version: kamailio 5.0.4 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 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 on 18:37:03 Oct 25 2017 with gcc 7.2.1 ```

* **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 `uname -a`) -->

``` Fedora 26 x86_64 Linux chicago.example.com 4.13.9-200.fc26.x86_64 #1 SMP Mon Oct 23 13:52:45 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux ```