Hi,

This looks like it could be a combination of a couple of things - one being a possible bug in the DMQ code, and the other not handling the script-generated message correctly.

If we rule out the latter first, I can take a look at the possible bug after.

For in-script communication over DMQ you should not call dmq_handle_message() since there will not be a registered peer/handler for the message. The idea is to handle it in script on the receiver side instead.

You do, however, need to call dmq_handle_message() for handling the built-in peer notifications and module-to-module communication.

So in your case it may look something like:

if(is_method("KDMQ")){
if($rU =~ "userOnline"){
//user came online in cluster, resume transactions if-any suspended
$avp(remoteUser) = $rb;
} else {
dmq_handle_message();

}
}

Let me know how that goes and in the meantime I will grab the core dump and take a look into the segfault.

All the best,

Charles

On Thu, 23 Apr 2020 at 22:38, SamyGo <govoiper@gmail.com> wrote:

Hi,

Is there a way to broadcast KDMQ to the cluster but not expect a reply back !?as far as I've read the source code dmq_bcast_message is exactly like dmq_send_message in a way that it expects a callback to be executed on response i.e expects a reply.

So, the situation I'm facing is I'm broadcasting message to cluster and I do not want a reply back. The following two options result in crash & core dump.

1 - If my script doesn't respond back, by use of dmq_handle_message, it marks the destined servers as "inactive" and stops usrloc sync process which isn't desirable.
2 - If I respond back with the dmq_handle_message it crashes the Kamailio which just received this broadcasted message.

Here is how its done in script:

broadcasting message to cluster:
dmq_bcast_message("userOnline", "$fu", "text/plain");

Receiving and handling a broadcast message:
route[DMQ_HANDLE] {
if(!(is_method("KDMQ") || $rm == "KDMQ")) return;

if(is_method("KDMQ") || $rm == "KDMQ"){
if($rU =~ "userOnline"){
//user came online in cluster, resume transactions if-any suspended
$avp(remoteUser) = $rb;
}
dmq_handle_message();
exit;
}
}

Related log lines:
Apr 23 21:15:48 kamailio[916]: ALERT: <script>: [da2c1-2f499] ------ DMQ_HANDLE: UserOnline Event Received ------
Apr 23 21:15:48 kamailio[916]: DEBUG: dmq [message.c:53]: ki_dmq_handle_message_rc(): dmq_handle_message [KDMQ sip:userOnline@9.8.7.123:5060]
Apr 23 21:15:48 kamailio[916]: DEBUG: dmq [message.c:66]: ki_dmq_handle_message_rc(): dmq_handle_message peer found: userOnline
Apr 23 21:15:48 kamailio[916]: DEBUG: <core> [core/receive.c:437]: receive_msg(): request-route executed in: 401461 usec
Apr 23 21:15:48 kamailio[935]: DEBUG: dmq [worker.c:87]: worker_loop(): dmq_worker [2 935] lock acquired
and crash/segfault..

Core dump: https://pastebin.com/S7ekCPfF

Any help or pointers to solve this would be really appreciated.

Best Regards,
Sammy
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