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Cisco Bug: CSCut34068 - Session Manager Assert at egtpc_handle_user_sap_event()

Last Modified

Dec 26, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(19) 17.4.0

Description (partial)

Symptom:
A session manager crash is observed with the following stack trace:

Assertion failure at sess/egtp/egtpc/egtpc_interface.c:156
  Note: Re-entering EGTPC application is currently blocked.The previous event sent by EGTPC application does not allow the application user to issue any further events.
  Function: egtpc_handle_user_sap_event()
  Expression: 0
  Code: CRASH
  Proclet: sessmgr (f=87000,i=173)
  Process: card=2 cpu=0 arch=X pid=8463 cpu=~7% argv0=sessmgr
  Crash time: 2015-Feb-24+13:43:55 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (131071@0xfffd4000, probably truncated):
    [ffffe430/X] __kernel_vsyscall() sp=0xfffd4668
    [0aeedecf/X] sn_assert() sp=0xfffd46a8
    [07b8932d/X] egtpc_handle_user_sap_event() sp=0xfffd4d28
    [08011dbb/X] mme_app_send_abort_proc_evt() sp=0xfffd5518
    [080e1122/X] mme_im_entry_state_awt_s11_handle_s11_mod_rsp() sp=0xfffd5568
    [080b4782/X] mme_fsm_event_handler() sp=0xfffd5a18
    [080e3943/X] mme_event_handler_im_entry_procedure() sp=0xfffd5a58
    [07fb6590/X] mme_procedure_handle_event() sp=0xfffd5ad8
    [080e6291/X] mme_disp_handle_emm_evt() sp=0xfffd5bd8
    [080ea376/X] mme_disp_attached_handle_s11_msg() sp=0xfffd5cb8
    [080b4782/X] mme_fsm_event_handler() sp=0xfffd6168
    [080ffa0b/X] mme_app_handle_events_from_egtpc_app() sp=0xfffe2a18
    [07bbc854/X] egtpc_send_cfm_evt() sp=0xfffe3648
    [07be60e0/X] egtpc_send_cfm_evt_abort_proc_v2() sp=0xfffe37d8
    [07be8288/X] egtpc_abort_active_proc_on_brec_v2() sp=0xfffe3c98
    [07bed50d/X] egtpc_abort_active_proc_on_brec() sp=0xfffe3cd8
    [07bed5c7/X] egtpc_abort_active_proc() sp=0xfffe3d58
    [07c072d7/X] egtpc_handle_delete_bearer_req_msg() sp=0xfffe3f68
    [07b60332/X] egtpc_handle_tun_n_mob_mgmt_message() sp=0xfffe4208

Conditions:
This happens in the following scenario:

1. Do a combined attach.
2. Create another PDN for some APN. For example, abc.com
3. MO-VOICE CALL ? PS HO not supported ? As part of this procedure, MME sends SUSPEND-NOTIFICATION to PGW for both, the default bearers and waits for the ACK.
4. PGW sends DELETE-BEARER-REQ messag for the other default PDN (For instance, apn=abc.com)
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