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Cisco Bug: CSCul94737 - sessmgr_pgw_handle_abort_procedure() crash seen in vzw CLAB ST40-CxGW

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(14)

Description (partial)

Symptom:
PGW detects GTPU-PATH-FAILURE on a dedicated bearer. Here PGW cleanups the sub-session entry but doesn't cleanup the corresponding pgw_trans_info_node. After that if PGW detects GTPC-PATH-FAILURE, while moving to SGW-Restoration state, PGW SM will try to abort all pending transaction, at this time it sees the hanging trans_info_node, while accessing the corresponding sub-session entry it crashes, as it is already freed earlier

Conditions:
(very rare and complex scenario)
SGW Restoration Feature is enabled on PGW, with following conditions:
1. PGW sends DeleteBearerReq (in this scenario, this is triggered due to GTPU-ERROR-IND on dedicated bearer) 2. and before getting back the DeleteBearerResponse from SGW, PGW detects GTPU-PATH-FAILURE on same dedicated bearer and followed by GTPC-PATH-FAILURE and trying to move to SGW-Restoration state.
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