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Cisco Bug: CSCuw26046 - Task restart on assert fail when handling 2G SUSPEND on S4 SGSN

Last Modified

Feb 12, 2018

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.6.1.62213 19.0.0 19.0.0.61274 19.3.5 19.3.5.64106 19.3.6 19.3.v6 19.4.0 19.5.0 19.6.0 19.6.v0 20.0.0 20.0.M0.62038 20.0.v0 20.1.0 20.1.a0 20.1.v0 20.3.0 21.0.0 21.0.v0 21.1.0 21.1.v0

Description (partial)

Symptom:
Task restart on assert fail when handling 2G SUSPEND on S4 SGSN, with the following stack trace:

  Note: Event EGTPC_CSFB_RESUME_NOTF_EVT in bearer state EGTPC_BEARER_STATE_MODIFY_BEARER_PENDING not handled yet
  Function: egtpc_handle_csfb_resume_notf_evt()
  Expression: 0
  Proclet: sessmgr (f=87000,i=26)
  Process: card=7 cpu=0 arch=X pid=27280 cpu=~3% argv0=sessmgr
  Restart time: 2015-Sep-13+21:54:51 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (75640@0xfffeb000):
    [ffffe430/X] __kernel_vsyscall() sp=0xfffebe78
    [0b366bdf/X] sn_assert() sp=0xfffebeb8
    [07ceb3f1/X] egtpc_handle_csfb_resume_notf_evt() sp=0xfffec318
    [07d0c776/X] egtpc_handle_user_sap_event() sp=0xfffecd48
    [075bae16/X] s4_smn_send_egtp_resume_notification() sp=0xffffa2e8
    [07664a26/X] s4_smn_handle_local_ho_cfm() sp=0xffffa428
    [075253a1/X] SmGenLocalHandoffCfm() sp=0xffffa798
    [071c5ce4/X] sma_lho_handle_s4_nw_proc_comp() sp=0xffffa838
    [07527e9e/X] sm_gen_s4_local_handoff_sgw_selection_done() sp=0xffffaa88
    [07635303/X] s4_smn_ms_fsm_st_intra_rau_pending_dns_response_handler() sp=0xffffab78
    [0758f075/X] s4_smn_sgw_dns_rsp_cb() sp=0xffffac28
    [08fb6c29/X] snaptr_procedure_complete.part.2() sp=0xffffb088
    [08fb18ee/X] vpnapi_query_cbk() sp=0xffffb128
    [0b4321ad/X] sn_msg_arriving_handle() sp=0xffffd238
    [0b413926/X] sn_loop_run() sp=0xffffd6f8
    [0b0e754d/X] main() sp=0xffffd768

Conditions:
The scenario is as below
1.       3G S4 Activation, DT enabled.
2.       Iu release
3.       Release Access Bearers to GW.
4.       Suspend from 2G.
5.       Suspend sent towards SGW.
6.       UE  sends Intra RAU from different RNC where DT is disabled. Hence MBR is  triggered and task restart is observed
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