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Cisco Bug: CSCvu31968 - sessmgr fail due to Segmentation fault on snx_pgw_driver_recreate_pdn

Last Modified

Oct 14, 2020

Products (2)

  • Cisco PGW Packet Data Network Gateway
  • Cisco PGW Packet Data Network Gateway

Known Affected Releases

21.21.0 To-be-fixed

Description (partial)

Symptom:
Session manager restarts is seen on PGW while call is handed over from 3G network to 4G network.
The restart is associated with this stack:
Fatal Signal 11: Segmentation fault
  PC: [0547d4e4/X] snx_pgw_driver_recreate_pdn()
  Faulty address: 0x672e6c60
  Signal from: kernel
  Signal detail: address not mapped to object
  Process: card=7 cpu=1 arch=X pid=11646 cpu=~22% argv0=sessmgr
  Recent errno: 11 Resource temporarily unavailable
  Stack (131071@0x0xffbbb000, probably truncated):
    [0547d4e4/X] snx_pgw_driver_recreate_pdn() sp=0xffbbb8b8
    [05550a12/X] snx_pgw_driver_request_control_dispatch() sp=0xffbbb9b8
    [069c99a6/X] sessmgr_handoff_call_ggsn_to_pgw() sp=0xffbc7c38
    [069bbe72/X] sessmgr_pgw_gngp_ho_pre_install_sess() sp=0xffbc91a8
    [085d82fe/X] egtpc_deduce_msg_trans_type() sp=0xffbc9678
  Last Bounce:
    Src: sessmgr (f=87000,i=763)

Conditions:
sessmgr restart is most likely occurring during inter-RAT handover on the node.
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