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### Description
<!-- Explain what you did, what you expected to happen, and what actually happened. -->
I found a memory leak which is causing some issues for us in our production. I think I was able to reproduce it and determine that this is happening when we set up an MSRP connection, and that connection is closed due to inactivity (for example when `tcp_connection_lifetime` is triggered).
### Troubleshooting
#### Reproduction
<!-- If the issue can be reproduced, describe how it can be done. -->
In this environment we have a WebRTC SIP client, connected to Kamailio and a second party using SIP, both sending messages each via MSRP protocol. Web Client and SIP client establish a session normally, all fine here, they can communicate. At this point we have this status:
``` sudo netstat -natp | grep 10.22.22 tcp 0 0 10.22.22.21:5060 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:10000 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:8080 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:10001 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:10002 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:8080 10.22.22.1:58508 ESTABLISHED 28640/kamailio tcp 0 0 10.22.22.21:10000 10.22.22.190:32786 ESTABLISHED 28646/kamailio tcp 0 0 10.22.22.21:8080 10.22.22.1:58506 ESTABLISHED 28591/kamailio
TESTER|centos8.4|tester21 [2021-10-06][16:23:57] [/home/vagrant]$ kamcmd -s udp:127.0.0.1:2046 mod.stats core all | grep tcp tcpconn_new(971): 198888 init_tcp(4700): 8192 init_tcp(4694): 32768 init_tcp(4686): 8 init_tcp(4679): 8 init_tcp(4672): 8 init_tcp(4666): 8 init_tcp(4654): 8 ```
In order to trigger this failure much faster, I set `tcp_connection_lifetime=60`. Then we just wait the required seconds to let the TCP connections closed. Then we finish the session, and stop our WebClient registering, so all connections are cleaned up.
``` TESTER|centos8.4|tester21 [2021-10-06][16:28:08] [/home/vagrant]$ sudo netstat -natp | grep 10.22.22 tcp 0 0 10.22.22.21:5060 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:10000 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:8080 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:10001 0.0.0.0:* LISTEN 28646/kamailio tcp 0 0 10.22.22.21:10002 0.0.0.0:* LISTEN 28646/kamailio TESTER|centos8.4|tester21 [2021-10-06][16:28:20] [/home/vagrant]$ kamcmd -s udp:127.0.0.1:2046 mod.stats core all | grep tcp tcpconn_new(971): 66296 init_tcp(4700): 8192 init_tcp(4694): 32768 init_tcp(4686): 8 init_tcp(4679): 8 init_tcp(4672): 8 init_tcp(4666): 8 init_tcp(4654): 8
```
As you can see there are no connections but there is memory allocated by `tcpconn_new`. I know this is related to the MSRP because we noticed our SIP Web Client is not closing the socket, so we just wait for Kamailio to close it.
#### Debugging Data
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gdb /path/to/kamailio /path/to/corefile bt full info locals list
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``` (paste your debugging data here) ```
#### Log Messages
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``` 2021-07-25T23:54:41Z ERROR ERROR: <core> [mem/f_malloc.c:415]: fm_search_defrag(): fm_search_defrag(0x7f39a284c000, 66288); Free fragment not found! 2021-07-25T23:54:41Z ERROR ERROR: <core> [mem/f_malloc.c:498]: fm_malloc(): fm_malloc(0x7f39a284c000, 66288) called from core: tcp_main.c: tcpconn_new(957), module: core; Free fragment not found! 2021-07-25T23:54:41Z ERROR ERROR: <core> [tcp_main.c:959]: tcpconn_new(): mem. allocation failure 2021-07-25T23:54:41Z ERROR ERROR: <core> [tcp_main.c:3985]: handle_new_connect(): tcpconn_new failed, closing socket ```
#### SIP Traffic
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``` (paste your sip traffic here) ```
### Possible Solutions
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` version: kamailio 5.1.6 (x86_64/linux) 7d1964 flags: STATS: Off, EXTRA_DEBUG, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, DBG_QM_MALLOC, 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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 7d1964 compiled on 13:54:09 Oct 5 2021 with gcc 8.4.1
```
Already tried with the latest stable Kamailio version, with the same issue.
* **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 `lsb_release -a` and `uname -a`) -->
``` Linux tester21 4.18.0-305.17.1.el8_4.x86_64 #1 SMP Wed Sep 8 14:00:07 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
centos 8 ```