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Cisco Bug: CSCun28026 - Sessmgr Crash- _do_acsmgr_send_med_packet()

Last Modified

Feb 05, 2019

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0 15.0(17)

Description (partial)

Symptom:
The following Sessmgr crash is observed in 15.0(53496) build:
********************* CRASH #01 ***********************
SW Version          : 15.0(53496)
Similar Crash Count : 1
Time of First Crash : 2014-Feb-17+16:43:16
Fatal Signal 11: Segmentation fault
  PC: [07d2f4e9/X] _do_acsmgr_send_med_packet()
  Faulty address: 0x84
  Signal from: kernel
  Signal detail: address not mapped to object
  Process: card=4 cpu=0 arch=X pid=4484 cpu=~9% argv0=sessmgr
  Crash time: 2014-Feb-17+21:43:16 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (19384@0xffff9000):
    [07d2f4e9/X] _do_acsmgr_send_med_packet() sp=0xffff92e8
    [07d2fa0d/X] acsmgr_send_med_packet() sp=0xffff9428
    [07d3267a/X] acs_sfw_med_flow_another_flow_bid_handle() sp=0xffff9468
    [07d32d99/X] acsmgr_data_rec_flow_action_bid_handling() sp=0xffff94a8
    [07d33dfe/X] acsmgr_med_post_packet_processing() sp=0xffff94e8
    [07d344f4/X] acsmgr_data_receive_merge_mode() sp=0xffff98e8
    [081afc53/X] acs_handle_datapath_events_from_sm_interface() sp=0xffff9938
    [0368777f/X] sessmgr_sef_initiate_data_packet_ind() sp=0xffff9998
    [036653c6/X] sessmgr_pcc_intf_send_data_packet_ind() sp=0xffff99d8
    [05e48374/X] sessmgr_pcc_fwd_packet() sp=0xffff9a28
    [05e0b5ae/X] sessmgr_ipv4_process_inet_pkt_part2_slow() sp=0xfffface8
    [05e17057/X] sessmgr_ipv4_process_inet_pkt() sp=0xffffb268
    [03595719/X] sessmgr_ipv4_sfw_process_nat_packets() sp=0xffffb378
    [05f516e1/X] sessmgr_med_ipv4_data_received() sp=0xffffb3e8
    [05d8d4b3/X] sessmgr_med_data_receive() sp=0xffffd5d8
    [0aae26c7/X] sn_loop_run() sp=0xffffdb68
    [0a8cbee4/X] main() sp=0xffffdba8

Conditions:
Crash seems to be happening when ICMP destionation unreachable packet is received and which hit the rule for which flow-action terminate is defined. We are creating RST and FIN-ACK for flow termination which should not be created for ICMP packets.
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