[SR-Users] Segmentation fault in DMQ module

[Daniel-Constantin Mierla]

Hello,

does it happen only when doing restart of kamailio? Can you send the
full backtrace from gdb?

Also, 5.0.x is no longer a supported release for quite some time, try to
upgrade to 5.2.x or even better to the latest one 5.3.x and see if you
can reproduce it with one of the supported releases, maybe it is
something that was already fixed.

Cheers,
Daniel

On 17.03.20 10:32, Virgílio Cunha wrote:
> Hello,
>
> I have in production environment with 4 proxies using DMQ to sync
> terminal registers and the DMQ configuration parameters is following:
> loadmodule "dmq.so"
> #modparam("dmq", "server_address", "sip:MY_IP_ADDRESS:MY_PORT_ADDRESS")
> modparam("dmq", "notification_address", "DMQ_HOSTS")
> modparam("dmq", "multi_notify", 1)
> modparam("dmq", "num_workers", 4)
>
>
> In the lab environment with the same configuration that in prod, I can
> simulate this problem with 12000 terminal REGISTERS and, when doing
> several restarts on a proxy, one of them is generated a coredump. 
> Analyzing the core, I can see that the problem is concurrency in the
> dmq synchronization. 
>
> Job_queue_size (...) is called with a valid /queue /and, but inside
> this function, the /queue /is null.
>
>
> (gdb) up
> #1  0x00007fefe58ee246 in job_queue_size (queue=0x0) at worker.c:254
> 254             return atomic_get(&queue->count);
> (gdb) print queue
> $1 = (job_queue_t *) 0x0
> (gdb) up
> #2  0x00007fefe58ed920 in add_dmq_job (msg=0x7ff028b453f8,
> peer=0x7fefebcc4df8) at worker.c:184
> 184                     if(job_queue_size(workers[i].queue) == 0) {
> (gdb) print i
> $2 = 1
> (gdb) print workers[i].queue
> $3 = (job_queue_t *) 0x7fefebce49b0
>
> If I configure DMQ with  num_workers=1 I can't reproduce this problem.
> I'm using the kamailio 5.0.8 release.
>
> Is this problem known to you? What is the right way to solve it?
>
> Best Regards,
> Virgílio Cunha
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda

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