Hi All,
I am facing an issue while sending heavy downlink traffic.
Scenario: A CPE is connected to the 5G Core and accessing data. After sometime UE lost the network and UE context release is received by the AMF.
At this moment I am generating downlink traffic for that UE. AMF is sending Paging Request to the UE and there is no response from UE.
If I increase the load, I see lot of 409 Conflict messages in SMF.
2024-10-17T12:07:24.173185192Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.178098681Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.183516753Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.188245270Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.193165088Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.198838158Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.204284772Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
2024-10-17T12:07:24.208340081Z [WARN][SMF][PFCP] Send N1N2Transfer failed: 409 Conflict
Once I started to see this log, SMF keeps on consuming memory and VM gets stuck.
The only way to come out of this situation is to kill smf process.
Does anyone observed similar issue or have any suggestions ?