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Cisco Bug: CSCuo88628 - 16.0.54765 sessmgr crash:ggsnapp_request_data_dispatch()

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

16.0(300)

Description (partial)

Symptom:
Following crash generated after upgrading to ASR5K 16.0.54765 build.

********************* CRASH #01 ***********************
SW Version          : 16.0(54765)
Similar Crash Count : 1
Time of First Crash : 2014-May-19+12:11:50

Fatal Signal 11: Segmentation fault
  PC: [07cdd355/X] ggsnapp_request_data_dispatch()
  Faulty address: 0x7c
  Signal from: kernel
  Signal detail: address not mapped to object
  Process: card=9 cpu=1 arch=X pid=7397 cpu=~8% argv0=sessmgr
  Crash time: 2014-May-19+12:11:50 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (75784@0xfffeb000):
    [07cdd355/X] ggsnapp_request_data_dispatch() sp=0xfffebc48
    [0458a3db/X] snx_pppdrv_request_data_dispatch() sp=0xfffebce8
    [05f42bc2/X] sessmgr_ipv6_process_user_pkt_part3.isra.264() sp=0xffffbeb8
    [05f49a35/X] sessmgr_ipv6_process_user_pkt_part2.isra.265() sp=0xffffbf28
    [05f4a8b1/X] sessmgr_handle_ipv6_packets_from_user() sp=0xffffc988
    [0407b2bd/X] sessmgr_ggsndrv_handle_inbound_data_packet() sp=0xffffcb68
    [05df18d2/X] sessmgr_egtpu_receive_gtpu_packet() sp=0xffffd0e8
    [05f8bccf/X] sessmgr_med_data_receive() sp=0xffffd288
    [0ab24bac/X] sn_epoll_run_events() sp=0xffffd2d8
    [0ab292a8/X] sn_loop_run() sp=0xffffd788
    [0a8ccdad/X] main() sp=0xffffd7f8

Conditions:
The crash is observed for following conditions

1)
Establish IPv6 3G call (only one primary context without TFT)
Handoff the call to 4G.
Handoff back to 3G
Send uplink ICMPv6 packet with ttl = 1

2)
3G IPv6 call (only one primary context with TFT)
clp->default_sub_session_no_tft = null in this case.
Uplink ICMPv6 packet with ttl=1 will cause this crash.
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