Symptom:
Assertion failure at sess/egtp/egtpc/egtpc_interface.c:102
  Function: egtpc_handle_user_sap_event()
  Expression: (((tun_rec) != ((void *)0)) && ((tun_rec)->magic == (('T'<<24) | ('U'<<16) | ('N'<<8) | ('R'))) && ((tun_rec)->active == (1)))
  Proclet: sessmgr (f=87000,i=107)
  Process: card=11 cpu=0 arch=X pid=10028 cpu=~77% argv0=sessmgr
  Crash time: 2014-Jan-09+09:24:26 UTC
  Recent errno: 115 Operation now in progress
  Stack (10344@0xffffb000):
    [f7e285a1/X] libc.so.6/kill() sp=0xffffbe18
    [0aa49a63/X] sn_assert() sp=0xffffbe48
    [073670d9/X] egtpc_handle_user_sap_event() sp=0xffffc478
    [06a0d78d/X] sessmgr_gprs_egtp_send_sess_abort_request() sp=0xffffc6b8
    [0417c4f6/X] sessmgr_gprs_fsm_state_irau_inbound() sp=0xffffc878
    [041c4cf1/X] sessmgr_gprs_fsm() sp=0xffffcfc8
    [041dbc76/X] sessmgr_gprs_process_drop_call() sp=0xffffd028
    [0415c355/X] sessmgr_gprs_callline_state_newcall_arrived() sp=0xffffd108
    [0415e394/X] sessmgr_gprs_callline_fsm() sp=0xffffd138
    [034ead11/X] sessmgr_session_setup_timeout() sp=0xffffd198
    [051e4b7a/X] tlib_serv() sp=0xffffd1d8
    [051e489b/X] tlib_tmr_tick() sp=0xffffd208
    [046c56ff/X] snx_timer_service() sp=0xffffd228
    [046c409f/X] snx_fast_service() sp=0xffffd258
    [05c9f8d4/X] sessmgr_snx_tick_callback() sp=0xffffd288
    [0aad9876/X] sn_loop_run() sp=0xffffd818
    [0a8c3524/X] main() sp=0xffffd858

Conditions:
During overnight call model run, this crash is seen in system-test setup.