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Cisco Bug: CSCvs91113 - Fatal Signal 6: 6 [0618736c/X] sgwdrv_egtpc_event_dispatch()

Last Modified

Sep 17, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.15.42 21.16.3 21.16.3.74340 21.16.d0 21.16.d0.74420 21.17.8 21.18.0.74796 21.18.2 21.19.0 21.19.n1 21.20.0

Description (partial)

Symptom:
Session Manager reload

Conditions:
System test on heavy load conditions. 

Conditions:


    1. Start two mme nodes.
    2. Before sending the Piggybacked MBREQ and CBRSP send the MBREQ from node mme2.
    3. Hold the SXMODRSP for this MBREQ.
    4. Now when the CBRSP piggybacked along with MBREQ arrives.
    5. CBRSP will not be sent to the sgw driver from egtpc due to default bearer already in MODIFY BEARER PENDING STATE, here it will queue the CBRSP at egtpc level
    and the flag is_piggybacking_used and pending_pgbk_rsp will not get set in this case.
    6. Now when we receive piggybacked MBREQ in connected sx pending state, we drop this MBREQ and try to flush the piggyback process.
    7. When we try to process the piggyback flush cmd sent from egtpc to sgw drv, we hit assert because the flag is_piggybacking_used and structure pending_pgbk_rsp
    is not set.
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