whosgonna created an issue (kamailio/kamailio#4626)
### Description
There appears to be a memory leak in Kamailio 6.1.1's TM module (although
perhaps it originates in the Dispatcher module).
### Troubleshooting
#### Reproduction
I've created a trivial example of a server using the dispatcher module to send
`OPTIONS` keep alive messages and nothing else. Given no additional traffic,
the shared memory used by the TM module will continually decrease.
#### Debugging Data
I've created a docker compose project to reproduce the issue in a trivial
example as described above.
https://github.com/whosgonna/6.1.1_memleak
`kamcmd mod.mem_stats tm all` can be used to observe the memory steadily
increasing over time.
#### Log Messages
No accompanying log message
#### SIP Traffic
I'm not sure if this can occur with traffic other than the SIP OPTIONS, but
from what I observed in our production environment the rate of the leak was
somewhat slow overnight (when traffic volume was low) and increased during
business hours, so I'm assuming it's any transactions.
### Possible Solutions
```
version: kamailio 6.1.1 (aarch64/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, DBG_QM_MALLOC, DBG_F_MALLOC,
DBG_TLSF_MALLOC, USE_PTHREAD_MUTEX, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
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.
id: unknown
compiled with gcc 14.2.0
```
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
(paste your output here)
```
* **Operating System**:
Reproduced using the 6.1.1 packages from deb.kamailio.org running on Debian 13
containers on arm64 hosts - both Amazon linux 2023 and Macintosh (arm64 CPU).
--
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https://github.com/kamailio/kamailio/issues/4626
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