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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. --> I tried to configure the carrierroute module with the description loaded from the database into an avp. But it crashes with a segfault while startup.

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. -->

``` /* ----- carrierroute params ----------------------------------------------- */ modparam("carrierroute", "config_source", "db") modparam("carrierroute", "db_url", ....) modparam("carrierroute", "fetch_rows", 2000) modparam("carrierroute", "db_load_description", 1) modparam("carrierroute", "match_mode", 10) modparam("carrierroute", "avoid_failed_destinations", 1) ```

``` if (cr_route("default", "default", "$(rU{s.strip,1})", "$rU", "call_id", "destination")) { .... } ```

#### 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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``` #0 avp_name_fixup (param=0x8018d1330) at cr_fixup.c:187 187 if (((gparam_p)(*param))->v.pve->spec->type == PVT_AVP && [New Thread 80165a600 (LWP 100186/<unknown>)] (gdb) bt full #0 avp_name_fixup (param=0x8018d1330) at cr_fixup.c:187 No locals. #1 0x00000008072f0256 in cr_route_fixup (param=0x8018d1330, param_no=6) at cr_fixup.c:242 my_hash_source = shs_call_id #2 0x000000000073238e in fix_actions (a=0x8018d1258) at core/route.c:919 t = (struct action *) 0x8018d1258 p = (struct proxy_l *) 0xffffffff00000048 tmp = 0x0 tmp_p = (void *) 0x8018d1660 ret = 0 i = 5 cmd = (sr31_cmd_export_t *) 0x80186dcd0 s = {s = 0xffffffff00000000 <Address 0xffffffff00000000 out of bounds>, len = 0} he = (struct hostent *) 0x4 ip = {af = 4859304, len = 0, u = {addrl = 0x7fffffff9be0, addr32 = 0x7fffffff9be0, addr16 = 0x7fffffff9be0, addr = 0x7fffffff9be0 "?"}} si = (struct socket_info *) 0x7fffffff9c10 lval = (struct lvalue *) 0xffffffff00000001 rve = (struct rval_expr *) 0x0 err_rve = (struct rval_expr *) 0x1 rve_type = RV_NONE err_type = 48625432 expected_type = RV_NONE rv = (struct rvalue *) 0x9b6cf7 rve_param_no = 0 #3 0x000000000068a1c4 in fix_rval (rv=0x8018d36c8, rve=0x8018d36c0) at core/rvalue.c:2873 No locals. #4 0x000000000068843e in fix_rval_expr (p=0x8018d36c0) at core/rvalue.c:3797 rve = (struct rval_expr *) 0x8018d36c0 ret = 32767 #5 0x000000000072aa08 in fix_actions (a=0x8018c94d0) at core/route.c:706 t = (struct action *) 0x8018d1d18 p = (struct proxy_l *) 0x68341cdd25 tmp = 0x3 <Address 0x3 out of bounds> tmp_p = (void *) 0x8018cc9c0 ret = 0 i = 1 cmd = (sr31_cmd_export_t *) 0x801869de0 s = {s = 0x8018cc9c0 "", len = 5} he = (struct hostent *) 0x9b6cf7 ip = {af = 6302080, len = 0, u = {addrl = 0x7fffffffcfc0, addr32 = 0x7fffffffcfc0, addr16 = 0x7fffffffcfc0, addr = 0x7fffffffcfc0 ""}} si = (struct socket_info *) 0x7fffffffd0a0 lval = (struct lvalue *) 0x800f42023 rve = (struct rval_expr *) 0x8018d36c0 err_rve = (struct rval_expr *) 0x0 rve_type = RV_INT err_type = 9938251 expected_type = 32767 rv = (struct rvalue *) 0x8018ccf20 rve_param_no = 0 #6 0x000000000073fd6d in fix_rl (rt=0xce3830) at core/route.c:2088 i = 0 ret = -12096 #7 0x000000000073fc37 in fix_rls () at core/route.c:2104 ret = 4 #8 0x000000000043b0ae in main (argc=4, argv=0x7fffffffeb30) at main.c:2635 cfg_stream = (FILE *) 0x8011fdc90 c = -1 r = 1 tmp = 0x800f84aa2 "H\213\vH;M?u\aH\203?([]??\225!??f\017\037\204" tmp_len = 32767 port = -5424 proto = 0 options = 0x979297 ":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 = 2763663412 rfd = 4 debug_save = 3 debug_flag = 1 dont_fork_cnt = 1 n_lst = (struct name_lst *) 0x7fffffffeaa0 p = 0x4 <Address 0x4 out of bounds> st = {st_dev = 93, st_ino = 160517, st_mode = 16832, st_nlink = 2, st_uid = 986, st_gid = 986, st_rdev = 332063, st_atim = {tv_sec = 1459764184, tv_nsec = 513386000}, st_mtim = {tv_sec = 1502352532, tv_nsec = 990638000}, st_ctim = {tv_sec = 1502352532, tv_nsec = 990638000}, st_size = 512, st_blocks = 8, st_blksize = 32768, st_flags = 0, st_gen = 3958570559, st_lspare = 0, st_birthtim = {tv_sec = 1459764184, tv_nsec = 513356000}} Current language: auto; currently minimal ```

#### 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). -->

``` 0(45720) DEBUG: <core> [core/route.c:872]: fix_actions(): fixing cr_route() 0(45720) DEBUG: <core> [core/pvapi.c:419]: pv_spec_lookup(): PV <$(rU{s.strip,1})> is not in cache 0(45720) DEBUG: <core> [core/pvapi.c:293]: pv_cache_add(): pvar [$(rU{s.strip,1})] added in cache 0(45720) DEBUG: <core> [core/pvapi.c:321]: pv_cache_lookup(): pvar [$rU] found in cache Segmentation fault (core dumped) ```

#### 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). -->

``` none ```

### 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`

``` # kamailio -v version: kamailio 5.1.0-dev5 (x86_64/freebsd) 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, 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, select, kqueue. id: unknown compiled on 16:54:24 Aug 9 2017 with clang 3.8 ```

* **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`) -->

``` # uname -a FreeBSD hostname.com 11.0-RELEASE-p9 FreeBSD 11.0-RELEASE-p9 #0: Tue Apr 11 08:48:40 UTC 2017 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64 ```