Symptom:
Crash with the foll stack trace will be seen

Assertion failure at sess/sgsn/sgsn-app/gtp_c/gtapp_mm_fsm.c:570
  Note: Could not find a valid MM node for TEID:<0>, Primitive:<12> from PMM
  Function: sgsn_app_pmm_gtp_event_dispatch()
  Expression: 0
  Code: CRASH
  Proclet: sessmgr (f=87000,i=95)
  Process: card=2 cpu=0 arch=X pid=6555 cpu=~3% argv0=sessmgr
  Crash time: 2014-Aug-24+18:50:09 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (43800@0xffff3000):
    [ffffe430/X] __kernel_vsyscall() sp=0xffff35f8
    [0ac0d63f/X] sn_assert() sp=0xffff3638
    [06a05fe9/X] sgsn_app_pmm_gtp_event_dispatch() sp=0xffff3a78
    [06af58cc/X] pmm_gtp_sgsn_context_ack() sp=0xffff3b88
    [06b73de2/X] pmm_util_abort_all_module() sp=0xffffcc78
    [06b79428/X] pmm_clear_subscriber() sp=0xffffd1c8
    [06bc7575/X] pmm_handle_inter_sgsn_rau_completion_at_old_sgsn() sp=0xffffd238
    [06bc82da/X] pmm_fsm_handle_rau_timer_exp() sp=0xffffd2b8
    [06b2861f/X] pmm_fsm_feed_event() sp=0xffffd348
    [06b30175/X] pmm_handle_rau_timer_callback() sp=0xffffd4c8
    [051b2d10/X] tlib_serv() sp=0xffffd518
    [051b2950/X] tlib_tmr_tick() sp=0xffffd568
    [0460c7e2/X] snx_timer_service() sp=0xffffd578
    [0460a6ef/X] snx_fast_service() sp=0xffffd5a8
    [05d9cbba/X] sessmgr_snx_tick_callback() sp=0xffffd5e8
    [0acabc69/X] sn_loop_run() sp=0xffffda98
    [0aa4ee6d/X] main() sp=0xffffdb08

Conditions:
Need to be analysed;Seems related to a particular scenario in aborted inter-SGSN RAU(SGSN as Old SGSN)