21 Jul
2019
21 Jul
'19
3:59 p.m.
Today I've analyzed this problem. Luckily it was reproduced in simulator.
The bad news seems to be a problem with the asn1c library.
More than 9 protocol IE cannot be built from InitialContextSetupRequest.
So, I've added some workaround as below.
if CS Fallback then
Add CS Fallback ProtofcolIE
Add RegisteredLAI
ELSE if RadioCababiltiy
Add RadioCapbability
endif
ELSE prevents InitialContextSetupRequest from creating more than 9 protocol
IEs.
See more information the following link:
https://github.com/open5gs/nextepc/commit/f19009c736875847f30d7ea010d1064c5…
Thanks a lot!
Best Regards,
Sukchan
On Thu, Jul 18, 2019 at 5:55 AM Romeu Medeiros <medeiros(a)medeiros.eng.br>
wrote:
Hello,
In some situations the Nextepc is crashing when try the MT-CSFB.
Here is the log:
07/17 17:48:53.270: [mme] WARNING: EMM_CAUSE : IMSI Unknown in HSS
(mme-sm.c:339)
07/17 17:48:54.480: [mme] WARNING: ERROR DIAMETER Result Code(5001)
(mme-fd-path.c:298)
07/17 17:48:54.480: [mme] WARNING: EMM_CAUSE : IMSI Unknown in HSS
(mme-sm.c:339)
07/17 17:48:55.611: [s1ap] ERROR: Failed to encode S1AP-PDU[-1]
(s1ap-encoder.c:41)
07/17 17:48:55.611: [mme] ERROR: s1ap_encode_pdu() failed
(s1ap-build.c:555)
07/17 17:48:55.611: [mme] FATAL: s1ap_send_initial_context_setup_request:
Assertion `rv == OGS_OK && s1apbuf' failed. (s1ap-path.c:252)
File Logging: '//var/log/nextepc/mme.log'
Configuration: '//etc/nextepc/mme.conf'
07/17 17:48:58.215: [mme] INFO: MME initialize...done (mme.c:28)
NextEPC daemon v0.5.0.26-b642c
07/17 17:48:58.215: [gtp] INFO: gtp_server() [10.3.15.38]:2123
(gtp-path.c:36)
07/17 17:48:58.215: [gtp] INFO: gtp_server()
[2804:828:3:15:b010:37ff:fe46:4521]:2123 (gtp-path.c:36)
07/17 17:48:58.215: [gtp] INFO: gtp_server()
[2804:828:3:208:48a0:1cff:fed9:b7c9]:2123 (gtp-path.c:36)
07/17 17:48:58.215: [gtp] INFO: gtp_connect() [127.0.0.2]:2123
(gtp-path.c:61)
07/17 17:48:58.216: [mme] INFO: sgsap client() [127.0.0.1]:29118
(sgsap-lkpath.c:47)
07/17 17:48:58.216: [mme] INFO: s1ap_server() [10.3.15.38]:36412
(s1ap-lkpath.c:44)
07/17 17:48:58.217: [fd] INFO: CONNECTED TO 'hss.localdomain'
(TCP,soc#14): (fd-logger.c:113)
07/17 17:48:58.802: [mme] INFO: eNB-S1 accepted[10.12.0.3]:36412 in
s1_path module (s1ap-lkpath.c:70)
In the attached file is the pcap from this moment, I will try to find what
is happened.
Thanks
Romeu Medeiros