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Cisco Bug: CSCvv17106 - Sessmgr restart | mme_app_util_send_create_bearer_rsp

Last Modified

Sep 17, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.16.1.73543 21.16.6

Description (partial)

Symptom:
For ViLTE (Video over LTE), MME might receive multiple dedicated bearer creation (QCI 1 and QCI 2) in single Bearer request message from PGW and 
the internal MPL proc would be created and would be assigned to a particular bearer.

In case of the above scenario, while sending "Create Bearer Response" due to wrong bearer context, the MPL proc is accessed incorrectly leading to crash.

  Stack (25000@0x0xffb5c000):
    [08eccc4e/X] mme_app_util_send_create_bearer_rsp() sp=0xffb5c588
    [090797e9/X] mme_create_brr_awt_ue_resp_erab_setup() sp=0xffb5c638
    [0904cc78/X] mme_fsm_event_handler() sp=0xffb5caf8
    [090c14cf/X] mme_event_handler_brr_procedure() sp=0xffb5cb28
    [08e327f0/X] mme_procedure_handle_event() sp=0xffb5cba8
    [0904fd31/X] mme_disp_handle_pdn_evt() sp=0xffb5d008
    [090e7e78/X] mme_disp_attached_handle_s1nas_msg() sp=0xffb5d308
    [0904cc78/X] mme_fsm_event_handler() sp=0xffb5d7c8
    [08e020ab/X] s1_access_recv_msg() sp=0xffb5dab8
    [08deea89/X] UzLiSztDatInd() sp=0xffb5db88
    [0f877587/X] SzUiSztDatInd() sp=0xffb5dba8
    [0f87f9e7/X] szUiSndDatInd() sp=0xffb5dc18
    [0f87884f/X] szSmRcvEstStMsg() sp=0xffb5dca8
    [0f862370/X] szLiCOMsgHandler() sp=0xffb5dd38
    [0f863129/X] szLiRcvFromLower() sp=0xffb5dfc8
    [0f865684/X] SzLiSctDatInd() sp=0xffb5e128
    [076366da/X] sn_ccpu_s1ap_handle_data_ind() sp=0xffb5e1b8
    [04cdd349/X] sessmgr_mmemgr_data_ind() sp=0xffb5e268
    [04cddaf2/X] sessmgr_handle_mmemgr_req_bulk_data_ind.part.16() sp=0xffb5fb48
    [04cddebe/X] sessmgr_handle_mmemgr_req_bulk_data_ind() sp=0xffb5fb88
    [0d1a7668/X] sn_msg_arriving_handle() sp=0xffb61c78
    [0d185f16/X] sn_loop_run() sp=0xffb62128
    [0ce5b625/X] main() sp=0xffb62198

Conditions:
Multiple dedicated bearer creation
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