UE not receive "detach accept" after "detach request"

[EugeneBogush]

Open5GS Release, Revision, or Tag

v2.6.1

Steps to reproduce

when UE registered in Network, I press "Flight mode on"

case1.tar.gz
s1ap_gtp.pcap.gz

Logs

sgwc.log:
----------
03/29 17:04:43.790: [sgwc] INFO: [Removed] Number of SGWC-UEs is now 2 (../src/sgwc/context.c:228)
03/29 17:04:43.790: [sgwc] INFO: [Added] Number of SGWC-UEs is now 3 (../src/sgwc/context.c:210)
03/29 17:04:43.790: [sgwc] INFO: [Added] Number of SGWC-Sessions is now 1 (../src/sgwc/context.c:891)
03/29 17:05:06.870: [gtp] ERROR: invalid step[0] (../lib/gtp/xact.c:588)
03/29 17:05:06.870: [gtp] ERROR: ogs_gtp_xact_update_rx() failed (../lib/gtp/xact.c:963)
03/29 17:05:09.367: [gtp] WARNING: [6] REMOTE Request Duplicated. Discard! for step 1 type 36 peer [127.0.0.2]:2123 (../lib/gtp/xact.c:558)
03/29 17:05:09.369: [gtp] ERROR: invalid step[0] (../lib/gtp/xact.c:588)
03/29 17:05:09.370: [gtp] ERROR: ogs_gtp_xact_update_rx() failed (../lib/gtp/xact.c:963)
03/29 17:05:11.868: [gtp] WARNING: [6] REMOTE Request Duplicated. Discard! for step 1 type 36 peer [127.0.0.2]:2123 (../lib/gtp/xact.c:558)
03/29 17:05:11.869: [gtp] ERROR: invalid step[0] (../lib/gtp/xact.c:588)
03/29 17:05:11.869: [gtp] ERROR: ogs_gtp_xact_update_rx() failed (../lib/gtp/xact.c:963)
03/29 17:05:14.369: [gtp] WARNING: [71] LOCAL  No Reponse. Give up! for step 1 type 36 peer [127.0.0.4]:2123 (../lib/gtp/xact.c:757)
03/29 17:05:14.369: [sgwc] ERROR: [001010000001004] No Delete Session Response (../src/sgwc/s11-handler.c:40)
03/29 17:05:14.369: [sgwc] ERROR: No GTP Message (../src/sgwc/sxa-handler.c:1301)
03/29 17:05:14.369: [sgwc] INFO: [Removed] Number of SGWC-Sessions is now 0 (../src/sgwc/context.c:897)

mme.log:
-------------
03/29 17:05:06.864: [emm] INFO: [001010000001004] Detach request (../src/mme/emm-sm.c:723)
03/29 17:05:14.369: [gtp] WARNING: [6] LOCAL  No Reponse. Give up! for step 1 type 36 peer [127.0.0.3]:2123 (../lib/gtp/xact.c:757)
03/29 17:05:14.369: [mme] ERROR: GTP Timeout : IMSI[001010000001004] Message-Type[36] (../src/mme/mme-gtp-path.c:152)
03/29 17:05:16.383: [mme] INFO: UE Context Release [Action:3] (../src/mme/s1ap-handler.c:1526)

Expected behaviour

MME must send to UE "detach accept"

Observed Behaviour

SGWC don't send "Delete Session response" to MME

eNodeB/gNodeB

No response

UE Models and versions

No response

[acetcom]

@EugeneBogush

The attached pcap does not have PFCP. So I don't know if this is an open5gs issue or not.

[EugeneBogush]

full in attach
full.pcap.gz

[acetcom]

@EugeneBogush

This is most likely not an open5gs issue.

A Delete Session Response is received from SMF in packet 1590, but after 8 seconds, SGW-C sends a PFCP Session Delete Request to SGW-U in packet 1641.

You need to check your environment.

Thanks a lot!
Sukchan

[EugeneBogush]

I'm using Baicells Neutrino224

[EugeneBogush]

Hi,
Today I checked "detach request" with last commit, and now the procedure runs without errors,
although "attach accept" is still missing

detach_2.pcap.gz