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Cisco Bug: CSCus70728 - ASR5000 MME 17.1.0 Assertion at mme_app_egtpc_abort_low_priority_trans()

Last Modified

Jan 29, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.1.0 17.2.0

Description (partial)

Symptom:
Assertion got fired when MME tries to abort the lower priority transactions where the higher priority transaction is pending. The following stack trace will be seen upon the assertion failure,

Assertion failure at sess/mme/mme-app/app/mme_egtp_fw.c:1048
  Function: mme_app_egtpc_abort_low_priority_trans()
  Expression: status==SN_STATUS_SUCCESS
  Proclet: sessmgr (f=87000,i=236)
  Process: card=12 cpu=0 arch=X pid=9273 cpu=~9% argv0=sessmgr
  Crash time: 2015-Jan-25+14:24:01 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (76568@0xfffeb000):
    [ffffe430/X] __kernel_vsyscall() sp=0xfffeb588
    [0aeedecf/X] sn_assert() sp=0xfffeb5c8
    [07fca510/X] mme_app_egtpc_abort_low_priority_trans() sp=0xfffeb628
    [080063b1/X] mme_app_send_egtp_msg() sp=0xfffeb6a8
    [08091f71/X] mme_app_go_idle_in_a_single_function() sp=0xffff7db8
    [0809380c/X] mme_emm_registered_conn_handle_rls_req() sp=0xffff7e58
    [080b4782/X] mme_fsm_event_handler() sp=0xffff8308
    [080e5d6f/X] mme_disp_handle_emm_evt() sp=0xffff8408
    [080edd67/X] mme_disp_attached_handle_s1nas_msg() sp=0xffff84b8
    [080b4782/X] mme_fsm_event_handler() sp=0xffff8968
    [07f974b9/X] s1_access_recv_msg() sp=0xffff9458
    [07f86a34/X] UzLiSztDatInd() sp=0xffff9528
    [0ce17037/X] SzUiSztDatInd() sp=0xffff9548
    [0ce1ed93/X] szUiSndDatInd() sp=0xffff95a8
    [0ce1820f/X] szSmRcvEstStMsg() sp=0xffff9638
    [0ce02c8a/X] szLiCOMsgHandler() sp=0xffff96b8
    [0ce0388c/X] szLiRcvFromLower() sp=0xffff9948
    [0ce05d6a/X] SzLiSctDatInd() sp=0xffff9aa8
    [06cc6ef6/X] sn_ccpu_s1ap_handle_data_ind() sp=0xffff9b38
    [0434bf17/X] sessmgr_mmemgr_data_ind() sp=0xffff9bd8
    [0434c644/X] sessmgr_handle_mmemgr_req_bulk_data_ind.part.12() sp=0xffffb4b8
    [0434ca3e/X] sessmgr_handle_mmemgr_req_bulk_data_ind() sp=0xffffb4f8
    [0afa6e28/X] sn_msg_arriving_handle() sp=0xffffd5e8
    [0af8be49/X] sn_loop_run() sp=0xffffda98

Conditions:
MME forces the UE to idle mode without aborting any running PDN procedures (like DDN, DBR etc) whenever any S1 message is received and the HO for 4G to 3G is in progress.
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