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Cisco Bug: CSCvv85781 - Sessmgr task restart during pure P hand-off procedure

Last Modified

Oct 14, 2020

Products (1)

  • Cisco PGW Packet Data Network Gateway

Known Affected Releases

21.14.10

Description (partial)

Symptom:
Sessmgr task restarted with following stacktrace.


Fatal Signal 11: Segmentation fault
  PC: [05ff9c93/X] snx_saegwdrv_request_data_dispatch()
  Faulty address: 0x13
  Signal from: kernel
  Signal detail: address not mapped to object
  Process: card=7 cpu=0 arch=X pid=10841 cpu=~9% argv0=sessmgr
  Recent errno: 11 Resource temporarily unavailable
  Build_number: 73408
  Stack (7096@0x0xffc29000):
    [05ff9c93/X] snx_saegwdrv_request_data_dispatch() sp=0xffc29a28
    [0427a9d5/X] sessmgr_saegw_egtpu_dispatch() sp=0xffc29bc8
    [0671bf07/X] sessmgr_egtpu_receive_gtpu_packet() sp=0xffc2a0b8
    [0695fdd2/X] sessmgr_med_proto_processing() sp=0xffc2a5b8
    [06965eb3/X] sessmgr_med_data_receive() sp=0xffc2a638
    [0ce860e4/X] sn_epoll_run_events() sp=0xffc2a688
    [0ce92e1b/X] sn_loop_run() sp=0xffc2ab38
    [0cb85735/X] main() sp=0xffc2aba8
  Last Bounce:
    Src: sessmgr (f=87000,i=5029)
    Dst:  (f=79000,i=70,m=336059)
    ID:  0x261b07005ec4c702
    Input:  SN_MSG_TYPE_NONE
    Output: cf_status_rsp
    Callback: [0969b700/X] tsi_cf_status_cb()
    Class: MEDIUM
    Flavour: NONBLOCKING REMOTE UNICAST 
    TCP: connct=0 elapsed=0ms code=NS_MISSING (Peer is not present)
    Nameservice: valid=0 age=0 card=0 cpu=0 pid=0 debug=0

Conditions:
Software version is 21.14.10 and lower. The problem appears to to be happening when UL packet is being processed and collapsed to pure P hand-off procedure.
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