[sr-dev] [kamailio/kamailio] Main process exited, code=dumped, status=11/SEGV with http_async (#2616)

[Anthony Messina]

### Description
I would like to use `http_async_query` and after enabling the module, I notice Kamailio's main process crashes on exit or restart.  I have searched and find a number of tickets regarding http_async and crashes, but none related to exit/restart.

### Troubleshooting
```
# coredumpctl info 410246
           PID: 410246 (kamailio)
           UID: 985 (kamailio)
           GID: 983 (kamailio)
        Signal: 11 (SEGV)
     Timestamp: Mon 2021-02-01 00:28:29 CST (11h ago)
  Command Line: /usr/sbin/kamailio -DD --loadmodule=systemdops.so -m 128 -M 8
    Executable: /usr/sbin/kamailio
 Control Group: /system.slice/kamailio.service
          Unit: kamailio.service
         Slice: system.slice
       Boot ID: 88a3838cfde647a29b3bd62f1e294ce2
    Machine ID: e71248e5a94b42069b4603dde95c99b4
       Storage: /var/lib/systemd/coredump/core.kamailio.985.88a3838cfde647a29b3bd62f1e294ce2.410246.1612160909000000.zst
       Message: Process 410246 (kamailio) of user 985 dumped core.
                
                Stack trace of thread 410246:
                #0  0x00007fd57d84383a BN_clear_free (libcrypto.so.1.1 + 0xb183a)
                #1  0x00007fd573f9d275 ssh_dh_finalize.part.0 (libssh.so.4 + 0x1e275)
                #2  0x00007fd573f8ec40 libssh_destructor (libssh.so.4 + 0xfc40)
                #3  0x00007fd57ead8cd3 _dl_fini (ld-linux-x86-64.so.2 + 0x10cd3)
                #4  0x00007fd57e7a4237 __run_exit_handlers (libc.so.6 + 0x40237)
                #5  0x00007fd57e7a43e0 exit (libc.so.6 + 0x403e0)
                #6  0x000000000041f61a handle_sigs (kamailio + 0x1f61a)
                #7  0x000000000042c61c main_loop (kamailio + 0x2c61c)
                #8  0x0000000000434cbd main (kamailio + 0x34cbd)
                #9  0x00007fd57e78c1e2 __libc_start_main (libc.so.6 + 0x281e2)
                #10 0x000000000041bbde _start (kamailio + 0x1bbde)
```
#### Reproduction
This happens at every kamailio shutdown.

#### 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

If you are familiar with gdb, feel free to attach more of what you consider to
be relevant.
-->
[gdb.txt](https://github.com/kamailio/kamailio/files/5905920/gdb.txt)

### Additional Information

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

```
version: kamailio 5.4.3-5.git06bd17a838.fc33.2 (x86_64/linux) e19ae3
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, 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, 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: e19ae3 
compiled on 00:00:00 Jan 24 2021 with gcc 10.2.1
```

* **Operating System**:

```
Linux 5.10.10-200.fc33.x86_64 #1 SMP Sun Jan 24 19:58:54 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
```

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https://github.com/kamailio/kamailio/issues/2616
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