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Cisco Bug: CSCvt75377 - Assert at mme_app_fill_s1_bearer_values

Last Modified

Sep 28, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases 21.19.6 21.20.0

Description (partial)

Collision between E-RAB Modification Indication and PDN Connectivity request.

When PDN Connectivity Request is received at MME, the PDN state is moved to MME_PDN_STATE_CONNECT_PENDING. During this time E-RAB Modification Indication is received at MME. Since E-RAB Mod Ind has more priority, MME proceeds with ducon nsa procedure. Now UE context Release Request is initated from eNB and as a result S1 Connection is released but the PDN which is in MME_PDN_STATE_CONNECT_PENDING is not destroyed.

Hence when Service Request is triggered from UE, while filling the Initial Context setup request message, assert is happening in the below condition

mme_brr->ubc_data.bd_sgw_s1u_teid != 0

while filling s1 bearer values.

During PDN Connectivity request ERAB Modification Indication is received and PDN connectivity is not established due to DUCON NSA
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