[Freeswitch-users] FreeSWITCH freezes when upgrading to 1.2 branch - SOLVED

[Anthony Minessale]

I checked the code and found the problem.  Zoiper was not happy to get a
NOTIFY with Expires: 0 after sending a SUBSCRIBE with Expires: 0
I added a patch to the code to skip responding with such a NOTIFY when
zoiper is present.

This is not a real fix but its better than having everyone's box die.



On Thu, Sep 12, 2013 at 9:40 AM, Ashley Breeden <ash at url.net.au> wrote:

> Hi All,
>
> I wanted to share my findings with everyone on the list in case anyone
> runs into the same issue I had as it what a nightmare to find.  A special
> thanks must be given to FreeSWITCH Consulting, especially Eliot who
> assisted in debugging and giving me some fresh ideas to look at.
>
> For some time now I have struggled to upgrade my servers to 1.2 stable
> from 1.0.head (git-e3698c2 2012-03-23 01-21-55 +0100).  The issue I always
> faced was is that after I upgraded the servers it would run happily for the
> next 5-10 hours but for no reason FreeSWITCH would become unresponsive and
> stop accepting registrations.  If you ran command like show channels,
> status etc the command would just freeze and there would be no response.
>
> Typically the freeze would occur when the servers were practically idle,
> looking at the logs you would see:
>
> [WARNING] sofia_reg.c:1524 SIP auth challenge (REGISTER) on sofia profile
> 'internal' for [1050 at domain.com] from ip x.x.x.x
> [WARNING] sofia.c:1639 MSG Thread 2 Started
> [WARNING] sofia.c:1639 MSG Thread 1 Started
>
> In attempt to resolve it I tried new hardware, changed from Centos to
> Debian, MySQL to Postgres, nothing I seemed to do fixed the issue.
>
> I started to run some network analysis on the server and what I noticed is
> about 20 minutes before the server freeze the traffic would spike from
> 100kbps to around 400kbps, on closer inspection I noticed that the 300kbps
> spike was actually between the server and a single IP on port 5060.
>  Analysing the packets (tcpdump -s0 -A port 5060)  I could see that one
> registration was sending SUBSCRIBE events at the rate of about 300-400 per
> second and FreeSWITCH was sending a NOTIFY back for each SUBSCRIBE, once
> the server froze the traffic would stop which is what made it hard to find
> as you had to be looking at the network traffic before the freeze.  Once I
> knew the user causing the increased traffic flow I was able to work out
> that the user agent causing this was Zoiper (rev. 11137).  It would appear
> Zoiper would get into a loop with the server and keep sending SUBSCRIBE
> packets for the message waiting indicator.
>
> I have spoken to Zoiper who have taken the issue on board and informed me
> it does not happen on Zoiper 3, but does happen on Zoiper 2, however they
> plan to fix it in the next release of Zoiper 2.  They suggested for the
> moment to disable the MWI Subscribe option by doing "Go to the preferences
> -> select your sip account -> enable "show advanced options" andchange the
> mwi subscribe drop down to "disabled"
>
> The strange thing with all this is that the same Zoiper client never had a
> problem on version 1.0.head (git-e3698c2 2012-03-23 01-21-55 +0100) but as
> soon as you upgraded to 1.2 or even the current git versions you would find
> that FreeSWITCH and Zoiper would get into a SUBSCRIBE/NOTIFY Loop.
>
> I hope this information is of some help to someone else in the future and
> is able to ensure they do not have to go through the same nightmare I did.
>
> If anyone has any suggestions on ways to limit the SUBSCRIBE/NOTIFY
> responses so that you can avoid this happening in the future I would be
> very interested to hear, even if you have any other feedback that might
> have assisted in finding this issue quicker I would be very interested.
>
>
> Regards,
>
> *Ashley Breeden*
> URL Networks Pty Ltd
> *WWW:* http://www.url.net.au
> *Twitter: *@urlnetworks
>
> *
> *
>
>
>
>
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
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>


-- 
Anthony Minessale II

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