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### Description

I have run in to an issue when sending diameter requests using the ims_diameter_server module. Shared memory keeps increasing and are not being freed until restart of kamailio. This leads to all shared memory is being used and no more are able to be allocated.

This only happens when the request is sent synchronously. When sent asynchronously shared memory is being freed as far as I can see.

Following functions have been used for sending requests.

diameter_request([peer], appid, commandcode, message) diameter_request_async([peer], appid, commandcode, message)

### Troubleshooting

Sent a bunch of diameter requests and verified that shared memory for the following functions are not freed.

do_receive(600): AAATranslateMessage(500): AAACreateAVP(137):

#### Reproduction

It's possible to reproduce by sending sync diameter request and verify shared memory.

Example of diameter request block

``` route[CHECK_LOCATION] { diameter_request("hss.ims.test.local", "16777217", "306", "[ " + "{ "avpCode":260, "vendorId":0, "Flags":64, "list":[ { "avpCode":266, "vendorId":0, "Flags":64, "int32":10415 }, { "avpCode":258, "vendorId":0, "Flags":64, "int32":16777217 } ] }, " + "{ "avpCode":277, "vendorId":0, "Flags":64, "int32":1 }, " + "{ "avpCode":283, "vendorId":0, "Flags":64, "string":"ims.test.local"}, " + "{ "avpCode":706, "vendorId":10415, "Flags":192, "int32":0 }, " + "{ "avpCode":700, "vendorId":10415, "Flags":192, "list": [ { "avpCode":601, "vendorId":10415, "Flags":192, "string":"tel:" + $fU + "" }]}, " + "{ "avpCode":707, "vendorId":10415, "Flags":192, "int32":0 }, " + "{ "avpCode":703, "vendorId":10415, "Flags":192, "int32":14 } ]"); xlog("L_INFO", "Sent Diameter request"); } ```

Stats

cdp:replies_received = 343310

shmem:fragments = 142 shmem:free_size = 1221489992 shmem:max_used_size = 948242168 shmem:real_used_size = 925993656 shmem:total_size = 2147483648 shmem:used_size = 558205656

kamcmd mod.stats cdp shm

do_receive(600): 256245808 AAATranslateMessage(500): 64420712 AAACreateAVP(137): 218100320 Total: 538774000

#### Debugging Data

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#### Log Messages

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#### SIP Traffic

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### Possible Solutions

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### Additional Information

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

``` version: kamailio 5.7.4 (x86_64/linux) dc393e 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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: dc393e compiled on 13:56:27 Feb 27 2024 with gcc 8.5.0 ```

* **Operating System**:

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``` Linux bmatkamas1 4.18.0-553.16.1.el8_10.x86_64 #1 SMP Thu Aug 1 04:16:12 EDT 2024 x86_64 x86_64 x86_64 GNU/Linux

Red Hat Enterprise Linux release 8.10 (Ootpa)

```