[Kamailio-Users] kamailio / deadlock3

[Aymeric Moizard]

On Thu, 28 Jan 2010, Daniel-Constantin Mierla wrote:

> Hello,
>
> On 1/28/10 11:18 AM, Aymeric Moizard wrote:
>> 
>> Got some more info:
>> 
>> The UDP deadlock always seems to happen after a SUBSCRIBE
>> is sent (in UDP) to mobipouce.com:
>> 
>> Jan 28 11:00:40 ns26829 /usr/sbin/kamailio[13363]: 
>> ERROR:core:tcp_blocking_connect: poll error: flags 18
>> Jan 28 11:00:40 ns26829 /usr/sbin/kamailio[13363]: 
>> ERROR:core:tcp_blocking_connect: failed to retrieve SO_ERROR (111) 
>> Connection refused
>> Jan 28 11:00:40 ns26829 /usr/sbin/kamailio[13363]: 
>> ERROR:core:tcpconn_connect: tcp_blocking_connect failed
>> Jan 28 11:00:40 ns26829 /usr/sbin/kamailio[13363]: ERROR:core:tcp_send: 
>> connect failed
>> Jan 28 11:00:40 ns26829 /usr/sbin/kamailio[13363]: ERROR:tm:msg_send: 
>> tcp_send failed
>> Jan 28 11:00:40 ns26829 /usr/sbin/kamailio[13363]: 
>> ERROR:tm:t_forward_nonack: sending request failed
>> 
>> This logs happens each time I got a SUSCRIBE being relayed to another 
>> server: mobipouce.com. But the deadlock doesn't appear each time.
>> 
>> mobipouce.com is an existing & running server where I can connect with UDP 
>> and TCP. However, the SRV record returns 2 host where one host is down.
>> (and I never got reply for the SUBSCRIBE: either if it fall into deadlock 
>> cas or not)
>> 
>> In case I can reproduce what step could I take to get more information 
>> about the issue? Any kmctl command?
>
> is it recovering itself or you have to restart? How much cpu usage you get?

Not noticed any CPU issue: I'll check exactly next time. (but traffic is 
growing up as kamailio don't answer any more.

> I if one or many eating lot of cpu, then use gdb to attach to the pid of 
> process using lot of cpu and get the back trace:
>
> gdb /path/to/kamailio pid

I think I can reproduce now. So I'll take a try.

It's definitly after the SRV check: the server choose the
sip2.mobipouce.com server where no sip server is running
and failed to connect. Then the network capture shows that
kamailio is still sending a few SIP packets (like NOTIFY)
but no SIP answers is coming out of kamailio.

I will do more testing, but I guess one can reproduce
by relaying to mobipouce.com!

Aymeric

> Cheers,
> Daniel
>
>> 
>> Regards,
>> Aymeric MOIZARD / ANTISIP
>> amsip - http://www.antisip.com
>> osip2 - http://www.osip.org
>> eXosip2 - http://savannah.nongnu.org/projects/exosip/
>> 
>> 
>> On Thu, 28 Jan 2010, Aymeric Moizard wrote:
>> 
>>> 
>>> Hi again people!
>>> 
>>> I'm currently having some trouble with my sip.antisip.com server.
>>> 
>>> Within the previous 2 or 3 days, kamailio sometimes fall into
>>> some kind of dead lock.
>>> 
>>> I've been checking my logs while the dead lock happen, and it
>>> seems (although I'm not sure with only the logs) that only UDP
>>> support is broken: I can see some TLS and TCP registrations but
>>> do not see the usual udp traffic (keep alive for example)
>>> 
>>> Any idea?
>>> 
>>> Aymeric MOIZARD / ANTISIP
>>> amsip - http://www.antisip.com
>>> osip2 - http://www.osip.org
>>> eXosip2 - http://savannah.nongnu.org/projects/exosip/
>>> 
>>> 
>>> _______________________________________________
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>>> 
>> 
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>
> -- 
> Daniel-Constantin Mierla
> * http://www.asipto.com/
>
>