ims_diameter_server not freeing shared memory - sr-users

2 Jan 2025

Hi,

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.

have anyone ran into this issue and found a remedy or can give some pointers how to
proceed?

Following functions have been used for sending requests.

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

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");
}

Shared memory after restart

kamcmd mod.stats cdp shm
Module: cdp
{
        save_peer_applications(779): 144
       make_send_pipe(126): 320
        dp_add_pid(92): 216
        AAAAddRequestHandler(69): 40
        cb_add(183): 8
        cb_add(177): 32
        cdp_sessions_init(178): 8
        cdp_sessions_init(173): 8
        cdp_sessions_init(165): 1024
        cdp_sessions_init(157): 3072
        cdp_sessions_init(149): 8
        cdp_trans_init(67): 8
        cdp_trans_init(60): 24
        add_timer(150): 24
        add_timer(145): 144
        new_peer(77): 16
        new_peer(75): 16
        new_peer(72): 16
        new_peer(69): 80
        new_peer(66): 96
        new_peer(60): 384
        peer_manager_init(84): 8
        peer_manager_init(83): 8
        peer_manager_init(82): 8
        peer_manager_init(79): 8
        peer_manager_init(76): 16
        worker_init(101): 16
        worker_init(94): 128
        worker_init(89): 32
        worker_init(87): 32
        worker_init(84): 8
        worker_init(82): 48
        timer_cdp_init(182): 8
        timer_cdp_init(179): 16
        diameter_peer_init_real(137): 8
        diameter_peer_init_real(131): 16
        diameter_peer_init_real(122): 16
        diameter_peer_init_real(115): 8
        diameter_peer_init_real(108): 8
        diameter_peer_init_real(101): 8
        diameter_peer_init_real(94): 8
        new_routing_entry(88): 64
        parse_dp_config(447): 16
        parse_dp_config(348): 8
        parse_dp_config(340): 16
        parse_dp_config(333): 40
        parse_dp_config(326): 144
        quote_trim_dup(96): 456
        new_dp_config(52): 184
        Total: 7024
}

Shared memory after 10 diameter requests

Module: cdp
{
        save_peer_applications(779): 144
        AAACreateAVP(137): 5072
        AAATranslateMessage(500): 1320
        do_receive(600): 7392
        make_send_pipe(126): 320
        dp_add_pid(92): 216
        AAAAddRequestHandler(69): 40
        cb_add(183): 8
        cb_add(177): 32
        cdp_sessions_init(178): 8
        cdp_sessions_init(173): 8
        cdp_sessions_init(165): 1024
        cdp_sessions_init(157): 3072
        cdp_sessions_init(149): 8
        cdp_trans_init(67): 8
        cdp_trans_init(60): 24
        add_timer(150): 24
        add_timer(145): 144
        new_peer(77): 16
        new_peer(75): 16
        new_peer(72): 16
        new_peer(69): 80
        new_peer(66): 96
        new_peer(60): 384
        peer_manager_init(84): 8
        peer_manager_init(83): 8
        peer_manager_init(82): 8
        peer_manager_init(79): 8
        peer_manager_init(76): 16
        worker_init(101): 16
        worker_init(94): 128
        worker_init(89): 32
        worker_init(87): 32
        worker_init(84): 8
        worker_init(82): 48
        timer_cdp_init(182): 8
        timer_cdp_init(179): 16
        diameter_peer_init_real(137): 8
        diameter_peer_init_real(131): 16
        diameter_peer_init_real(122): 16
        diameter_peer_init_real(115): 8
        diameter_peer_init_real(108): 8
        diameter_peer_init_real(101): 8
        diameter_peer_init_real(94): 8
        new_routing_entry(88): 64
        parse_dp_config(447): 16
        parse_dp_config(348): 8
        parse_dp_config(340): 16
        parse_dp_config(333): 40
        parse_dp_config(326): 144
        quote_trim_dup(96): 456
        new_dp_config(52): 184
        Total: 20808
}

Shared memory after 170k requests

 do_receive(600): 131363752
 AAATranslateMessage(500): 32326656
 AAACreateAVP(137): 110067152
Total: 273764840

Br
Martin