[OpenSIPS-Users] OpenSIPS fix_route_dialog crashes

Newlin, Ben Ben.Newlin at inin.com
Fri Jul 29 14:54:13 CEST 2016 

This is 1.11.6, running on CentOS 7.


Ben Newlin

From: <users-bounces at lists.opensips.org> on behalf of Bogdan-Andrei Iancu <bogdan at opensips.org>
Reply-To: OpenSIPS users mailling list <users at lists.opensips.org>
Date: Friday, July 29, 2016 at 8:50 AM
To: "Newlin, Ben" <Ben.Newlin at inin.com>, OpenSIPS users mailling list <users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] OpenSIPS fix_route_dialog crashes

Ben,

What OpenSIPS version is this (the crashing one) ? 1.11 or 2.1 ?

Regards,


Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 27.07.2016 19:02, Newlin, Ben wrote:
I have identified that these crashes are occurring when the far end system is not returning the Record-Route headers in the 200 OK response. The headers are present in the 180 response, but not the 200 OK. I have reproduced the scenario using SIPp and captured a SIP trace: http://pastebin.com/ckKk3EhY

The crash occurs on receipt of the ACK request and attempt to match the dialog.

I also captured a BT for this scenario as well, in case anything specific in the trace made the issue easier to find: http://pastebin.com/cM3FhPiw

I am working with the other system to try to fix their behavior.

Ideally the Record-Route headers from previous replies could be used in this case to allow the call to succeed, but I don’t know if that is possible.

Thanks,

Ben Newlin

From: "Newlin, Ben" <Ben.Newlin at inin.com><mailto:Ben.Newlin at inin.com>
Date: Wednesday, July 27, 2016 at 9:44 AM
To: Bogdan-Andrei Iancu <bogdan at opensips.org><mailto:bogdan at opensips.org>, OpenSIPS users mailling list <users at lists.opensips.org><mailto:users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] OpenSIPS fix_route_dialog crashes

Bogdan,

This is a different scenario than the other you responded to. As I said, we have two types of servers that work together. One is a load-balancer and runs as a proxy. It uses double Record-Route because it sends messages between public and private networks. Then we have our other servers using TH which receive those requests. We are not using TH and RR on the same server (although I would like to).

If validate_dialog() and fix_route_dialog() (and possibly loose_route()) should not be called when using TH, I believe the documentation should reference that. It states that match_dialog() must be used with TH, but does not indicate that the other functions should not be used or that the functionality won’t work. There is also no documentation of the incompatibility between RR and TH.

Either way, I ran a test where I removed all calls to loose_route(), validate_dialog(), and fix_route_dialog() from my script. The crash still occurred and the BT still pointed to fix_route_dialog() function. So it must be getting called from within Dialog module somewhere. That BT is here: http://pastebin.com/wu2X2Hxh

I collected this BT with loose_route() being called from my script, but not validate_dialog() or fix_route_dialog(): http://pastebin.com/6V7yPaHF

This BT was collected with all three functions being called from my script: http://pastebin.com/fZYYdndn


Ben Newlin

From: Bogdan-Andrei Iancu <bogdan at opensips.org><mailto:bogdan at opensips.org>
Date: Wednesday, July 27, 2016 at 3:57 AM
To: OpenSIPS users mailling list <users at lists.opensips.org><mailto:users at lists.opensips.org>, "Newlin, Ben" <Ben.Newlin at inin.com><mailto:Ben.Newlin at inin.com>
Subject: Re: [OpenSIPS-Users] OpenSIPS fix_route_dialog crashes

Hi Ben,

First, if you use TH, makes no sense to do Record-Routing - there are 2 SIP concepts that overlaps. You either act as an end-point (by doing TH), either as a proxy (doing RR).

If doing TH, makes no sense to use validate + fix as these functions check and repair the routing information in the request (like Route and Contact headers). if you do TH, this routing info is actually hidden and added by OpenSIPS, so there is nothing to fix and repair.

Nevertheless, this should not crash or corrupt OpenSIPS. HAve you managed to get a corefile ?

Also if you suspect memory corruption, you can compile-in the memory debugger - see http://www.opensips.org/Documentation/TroubleShooting-OutOfMem .

Regards,




Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 26.07.2016 23:20, Newlin, Ben wrote:
I have had 3 OpenSIPS server crashes in the last week. All were due to segmentation faults. I was not able to capture core dumps; I am configuring that now to catch the next crash.

My logs leading up to the crash are full of errors from fix_route_dialog() complaining about invalid URIs for sequential requests:

Jul 26 19:34:02 [220] ERROR:dialog:fix_route_dialog: Failed to parse SIP uri
Jul 26 19:34:02 [220] ERROR:core:parse_uri: bad uri, state 0 parsed: <ip:1> (4) / <ip:10.18.8.18:5060;ftag=gK0448f137;lr;r2=on>> (44)

Jul 26 19:11:19 [218] ERROR:dialog:fix_route_dialog: Failed to parse SIP uri
Jul 26 19:11:19 [218] ERROR:core:parse_uri: bad uri, state 0 parsed: <b0i2> (4) / <b0i2yjor;transport=udp<sip:10.18.8.17:5060;ftag=7207ce89;lr;r2=on> (65)

Jul 26 17:43:19 [220] ERROR:dialog:fix_route_dialog: Failed to parse SIP uri
Jul 26 17:43:19 [220] ERROR:core:parse_uri: bad uri, state 0 parsed: <ervi> (4) / <ervice_id6fdbc70f-2438-4726-807c-0d081df4d87> (44)

Many times the “URI” displayed in the error message is actually internal OpenSIPS variables, as in the last error above. When they are from the SIP message, I have verified that the messages themselves are correctly formatted. This leads me to believe there is memory corruption occurring.

This all started when I updated my load-balancer servers to use Record-Routing, specifically the “double_rr” mechanism for when multiple interfaces exist. The Record-Routing is occurring on different servers which have not crashed. Only the servers receiving the Record-Routed messages are experiencing the errors.

Here is a piece of the code processing sequential requests. I am using the topology_hiding() functionality of the Dialog module. Are validate_dialog() and fix_route_dialog() still valid in a topology_hiding scenario?

if (t_check_trans())
    setflag(SEQ_REQUEST);

  if (has_totag())
  {
    loose_route();

    if (match_dialog())
    {
      if (!validate_dialog())
        fix_route_dialog();

      if (is_method("BYE"))
        setflag(ACC_FLAG);

      setflag(SEQ_REQUEST);
    }
    else if (!isflagset(SEQ_REQUEST))
    {
      if (!is_method("ACK")) {
        route(rlog, LV_ERROR, "check_sequential", "Sequential request not matched");
        route(reply_error, "481", "Call Does Not Exist");
      }

      return(EXIT);
    }
  }

I will attempt to get core dumps of future crashes.

Thanks,
Ben Newlin






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