Romeu Medeiros medeiros at
Wed Jul 17 21:17:31 UTC 2019


I some situations, when the MME lost connection with the OSMO-MSC and
return this connection if I try send a MT-CSFB the OSMO-MSC is crashing.

I get this error in the log:

<0006> sgs_iface.c:470 XXXXXXXXXX state == 1  conf_by_radio_contact_ind == 1
<0011> sgs_iface.c:251 (sub
IMSI-724210000000003:MSISDN-5544912340003:TMSI-0x8E44F269) Tx
PAGING-REQUEST suitable MME found, but no SGS connection present!
<0005> sgs_iface.c:480
SGs-UE(imsi:724210000000003)[0x563949b08fc0]{SGs-ASSOCIATED}: Will not Page
(no MME)
<0005> paging.c:101 Paging:
IMSI-724210000000003:MSISDN-5544912340003:TMSI-0x8E44F269 for MNCC:
establish call: Starting paging failed (rc=-22)
<0001> gsm_04_08_cc.c:1922 trans(CC
IMSI-724210000000003:MSISDN-5544912340003:TMSI-0x8E44F269 callref-0x1396
tid-255) Failed to allocate paging token.
Segmentation fault (core dumped)

I'll try why this happened, but I'm not getting used to it in the OSMO
source code. Can you tell me (if you have time) how identify where this
crash is occouring?

In the attach have the PCAP of the SGS between the OSMO and NextEPC-MME.


Romeu Medeiros

On Wed, Jul 17, 2019 at 6:40 AM Harald Welte <laforge at> wrote:

> Hi Romeu,
> On Tue, Jul 16, 2019 at 07:45:02PM -0300, Romeu Medeiros wrote:
> > I think that in some situations the msc is losing the sgs registrations
> and
> > can't forward the sms. But I will more tests before to disturb you there.
> feel free to share some pcap files, we're also happy to review them from
> the osmocom
> point of view.
> --
> - Harald Welte <laforge at>
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
>                                                   (ETSI EN 300 175-7 Ch.
> A6)
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