[SIP Beyond VoIP] Another strange problem whcih I can't overcome for a long time.

Hadzhiev, Tihomir tihomir.hadzhiev at acision.com
Wed Nov 14 15:41:11 CET 2012


Hi Saul,

I have just noticed, that indeed when a XMPP -> SIP/MSRP chat session is initiated, Sylk throws in the core_trace.txt log the following:

2012-11-14 15:10:03.602821 [sylk-server 21975] (5) sip_endpoint.c: Processing incoming message: Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:03.613004 [sylk-server 21975] (5) dlg0x7fb124c64: Received Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:03.613269 [sylk-server 21975] (5) inv0x7fb124c64: Received Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8), sending ACK
2012-11-14 15:10:03.614355 [sylk-server 21975] (5) dlg0x7fb124c64: Sending Request msg ACK/cseq=3666 (tdta0x7fb11c059c20)
2012-11-14 15:10:03.614787 [sylk-server 21975] (5)  sip_resolve.c: Starting async DNS A query: target=scscf.open-ims.test, transport=Unspecified, port=6060
2012-11-14 15:10:03.615148 [sylk-server 21975] (4)  sip_resolve.c: Failed to resolve 'scscf.open-ims.test'. Err=320045 (No nameserver is in DNS resolver (PJLIB_UTIL_EDNSNONS))
2012-11-14 15:10:05.755224 [sylk-server 21975] (5) sip_endpoint.c: Processing incoming message: Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:05.755431 [sylk-server 21975] (5) dlg0x7fb124c54: Received Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:05.756249 [sylk-server 21975] (5) inv0x7fb124c54: Received Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8), sending ACK
2012-11-14 15:10:05.758654 [sylk-server 21975] (5) dlg0x7fb124c54: Sending Request msg ACK/cseq=15732 (tdta0x7fb11c063510)
2012-11-14 15:10:05.759068 [sylk-server 21975] (5)  sip_resolve.c: Starting async DNS A query: target=scscf.open-ims.test, transport=Unspecified, port=6060
2012-11-14 15:10:05.760364 [sylk-server 21975] (4)  sip_resolve.c: Failed to resolve 'scscf.open-ims.test'. Err=320045 (No nameserver is in DNS resolver (PJLIB_UTIL_EDNSNONS))
2012-11-14 15:10:07.593676 [sylk-server 21975] (5) sip_endpoint.c: Processing incoming message: Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:07.599211 [sylk-server 21975] (5) dlg0x7fb124c64: Received Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:07.599429 [sylk-server 21975] (5) inv0x7fb124c64: Received Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8), sending ACK
2012-11-14 15:10:07.599885 [sylk-server 21975] (5) dlg0x7fb124c64: Sending Request msg ACK/cseq=3666 (tdta0x7fb11c059c20)
2012-11-14 15:10:07.600577 [sylk-server 21975] (5)  sip_resolve.c: Starting async DNS A query: target=scscf.open-ims.test, transport=Unspecified, port=6060
2012-11-14 15:10:07.600752 [sylk-server 21975] (4)  sip_resolve.c: Failed to resolve 'scscf.open-ims.test'. Err=320045 (No nameserver is in DNS resolver (PJLIB_UTIL_EDNSNONS))
2012-11-14 15:10:09.741388 [sylk-server 21975] (5) sip_endpoint.c: Processing incoming message: Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:09.743110 [sylk-server 21975] (5) dlg0x7fb124c54: Received Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:09.743301 [sylk-server 21975] (5) inv0x7fb124c54: Received Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8), sending ACK
2012-11-14 15:10:09.743486 [sylk-server 21975] (5) dlg0x7fb124c54: Sending Request msg ACK/cseq=15732 (tdta0x7fb11c063510)
2012-11-14 15:10:09.743720 [sylk-server 21975] (5)  sip_resolve.c: Starting async DNS A query: target=scscf.open-ims.test, transport=Unspecified, port=6060
2012-11-14 15:10:09.743871 [sylk-server 21975] (4)  sip_resolve.c: Failed to resolve 'scscf.open-ims.test'. Err=320045 (No nameserver is in DNS resolver (PJLIB_UTIL_EDNSNONS))
2012-11-14 15:10:11.583527 [sylk-server 21975] (5) sip_endpoint.c: Processing incoming message: Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:11.585779 [sylk-server 21975] (5) dlg0x7fb124c64: Received Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:11.586457 [sylk-server 21975] (5) inv0x7fb124c64: Received Response msg 200/INVITE/cseq=3666 (rdata0x7fb11c06d5d8), sending ACK
2012-11-14 15:10:11.587705 [sylk-server 21975] (5) dlg0x7fb124c64: Sending Request msg ACK/cseq=3666 (tdta0x7fb11c059c20)
2012-11-14 15:10:11.589259 [sylk-server 21975] (5)  sip_resolve.c: Starting async DNS A query: target=scscf.open-ims.test, transport=Unspecified, port=6060
2012-11-14 15:10:11.590375 [sylk-server 21975] (4)  sip_resolve.c: Failed to resolve 'scscf.open-ims.test'. Err=320045 (No nameserver is in DNS resolver (PJLIB_UTIL_EDNSNONS))
2012-11-14 15:10:13.730792 [sylk-server 21975] (5) sip_endpoint.c: Processing incoming message: Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:13.733546 [sylk-server 21975] (5) dlg0x7fb124c54: Received Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8)
2012-11-14 15:10:13.733703 [sylk-server 21975] (5) inv0x7fb124c54: Received Response msg 200/INVITE/cseq=15732 (rdata0x7fb11c06d5d8), sending ACK
2012-11-14 15:10:13.733849 [sylk-server 21975] (5) dlg0x7fb124c54: Sending Request msg ACK/cseq=15732 (tdta0x7fb11c063510)
2012-11-14 15:10:13.733994 [sylk-server 21975] (5)  sip_resolve.c: Starting async DNS A query: target=scscf.open-ims.test, transport=Unspecified, port=6060
2012-11-14 15:10:13.734133 [sylk-server 21975] (4)  sip_resolve.c: Failed to resolve 'scscf.open-ims.test'. Err=320045 (No nameserver is in DNS resolver (PJLIB_UTIL_EDNSNONS))


However in this case it does not die with segmentation fault. Instead the chat session gets established.

Tiho

-----Original Message-----
From: Saúl Ibarra Corretgé [mailto:saul at ag-projects.com]
Sent: 14 November 2012 15:14
To: Hadzhiev, Tihomir
Cc: sipbeyondvoip at lists.ag-projects.com
Subject: Re: [SIP Beyond VoIP] Another strange problem whcih I can't overcome for a long time.

Hi,

Please don't send 10MB attachments, it's not nice for a mailing list :-)

On Nov 14, 2012, at 3:00 PM, Hadzhiev, Tihomir wrote:

> Hi Saul,
>
> Indeed I think you are right, that there is an internal problem, please find attached the core backtrace ( at least I hope that's what I had to generate as I'm not 100% sure of the trace command you gave me :)
>

What's unclear?

> Here is also some strings output from the core file which eventually shows the problem. And BTW, the scscf.open-ims.test is perfectly resolvable from the Sylk box.
>

I'm sure it is, but we did have problems like this before, it's a problem in our library and I'm trying to a) understand if this is the exact problem, and b) understand why it segfaults instead of just giving an error.

Please open the core file with gdb as I mentioned:

gdb python core

Then in the CLI presented, enable logging:

set logging on

The get the full backtrace:

bt full

The exit:

exit

You should now have a gdb.txt file in the current directory, send that one.


Regards,

--
Saúl Ibarra Corretgé
AG Projects





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