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### Description Kamailio crashes on shutdown in `geoip2_destroy_pv` in `main process` process if geoip2 database was reloaded.

<!-- Explain what you did, what you expected to happen, and what actually happened. -->

### Troubleshooting `libmaxminddb.so.0` uses `calloc()` internally to allocate memory for metadata languages and descriptions. On reload via e.g. `ctl` metadata memory is allocated in `ctl` process but `main process` tries to cleanup it.

#### Reproduction Load `geoip2` module ``` loadmodule "geoip2.so" modparam("geoip2", "path", "/path/to/your/geolite2.mmdb") ``` Reload database and stop/restart Kamailio ``` kamcmd geoip2.reload service kamailio restart ``` <!-- If the issue can be reproduced, describe how it can be done. -->

#### Debugging Data ``` (gdb) bt #0 __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44 #1 0x00007f117bc59e8f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78 #2 0x00007f117bc0afb2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26 #3 0x00007f117bbf5472 in __GI_abort () at ./stdlib/abort.c:79 #4 0x00007f117bc4e430 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f117bd68459 "%s\n") at ../sysdeps/posix/libc_fatal.c:155 #5 0x00007f117bc637aa in malloc_printerr (str=str@entry=0x7f117bd660b1 "free(): invalid pointer") at ./malloc/malloc.c:5660 #6 0x00007f117bc65534 in _int_free (av=<optimized out>, p=<optimized out>, have_lock=have_lock@entry=0) at ./malloc/malloc.c:4435 #7 0x00007f117bc67e8f in __GI___libc_free (mem=<optimized out>) at ./malloc/malloc.c:3385 #8 0x00007f1158e6e454 in free_languages_metadata (mmdb=0x7f11592db390) at ./src/maxminddb.c:1860 #9 free_mmdb_struct (mmdb=0x7f11592db390) at ./src/maxminddb.c:1843 #10 0x00007f1158e708a5 in MMDB_close (mmdb=<optimized out>) at ./src/maxminddb.c:1803 #11 0x00007f1158e7ebc9 in geoip2_destroy_pv () at ./src/modules/geoip2/geoip2_pv.c:567 #12 0x000056094fd5f743 in destroy_modules () at core/sr_module.c:881 #13 0x000056094fbb7910 in cleanup (show_status=show_status@entry=1) at ./src/main.c:587 #14 0x000056094fbb86ad in shutdown_children (show_status=show_status@entry=1, sig=15) at ./src/main.c:735 #15 0x000056094fbb932b in handle_sigs () at ./src/main.c:835 #16 0x000056094fbbf1e9 in main_loop () at ./src/main.c:2002 #17 0x000056094fbb353c in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.c:3256 ``` ``` (gdb) f 8 #8 0x00007f1158e6e454 in free_languages_metadata (mmdb=0x7f11592db390) at ./src/maxminddb.c:1860 1860 FREE_AND_SET_NULL(mmdb->metadata.languages.names); (gdb) p *mmdb $1 = {flags = 1, filename = 0x0, file_size = 652795, file_content = 0x7f1158dcd000 <error: Cannot access memory at address 0x7f1158dcd000>, data_section = 0x7f1158e6c430 <error: Cannot access memory at address 0x7f1158e6c430>, data_section_size = 459, metadata_section = 0x7f1158e6c546 <error: Cannot access memory at address 0x7f1158e6c546>, metadata_section_size = 181, full_record_byte_size = 6, depth = 32, ipv4_start_node = {netmask = 0, node_value = 0}, metadata = {node_count = 108720, record_size = 24, ip_version = 4, database_type = 0x0, languages = {count = 1, names = 0x560951ca6250}, binary_format_major_version = 2, binary_format_minor_version = 0, build_epoch = 1648557301, description = {count = 1, descriptions = 0x560951ca5470}}} (gdb) f 9 #9 free_mmdb_struct (mmdb=0x7f11592db390) at ./src/maxminddb.c:1843 1843 free_languages_metadata(mmdb); (gdb) f 10 #10 0x00007f1158e708a5 in MMDB_close (mmdb=<optimized out>) at ./src/maxminddb.c:1803 1803 void MMDB_close(MMDB_s *const mmdb) { free_mmdb_struct(mmdb); } (gdb) f 11 #11 0x00007f1158e7ebc9 in geoip2_destroy_pv () at ./src/modules/geoip2/geoip2_pv.c:567 567 MMDB_close(_handle_GeoIP); ``` <!-- 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.

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### Additional Information

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

``` /usr/sbin/kamailio -V version: kamailio 5.8.1 (x86_64/linux) 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_SEND_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: unknown compiled with gcc 12.2.0 ```

* **Operating System**:

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``` cat /etc/os-release PRETTY_NAME="Debian GNU/Linux 12 (bookworm)" NAME="Debian GNU/Linux" VERSION_ID="12" VERSION="12 (bookworm)" VERSION_CODENAME=bookworm ID=debian HOME_URL="https://www.debian.org/" SUPPORT_URL="https://www.debian.org/support" BUG_REPORT_URL="https://bugs.debian.org/" ```