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Cisco Bug: CSCur78778 - Prolonged high CPU: compiling large ACL for service-policy on stdby unit

Last Modified

Aug 09, 2018

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

8.4(2.8) 8.4(7.23) 9.0(4.24) 9.1(5.19)

Description (partial)

Symptom:
During compilation of very large ACLs in failover-pair, cpu usage of the standby unit keeps almost 100% by both processes of DATAPATH and tmach compile thread for hours when the standby unit receives many replicated new connections from active mate.

Conditions:
- ASA5585 SSP-20 or SSP-40 failover pair
- Active unit continuously processes 6,000+ new connections per second(cps), and replicate it to standby
- ASA has very large ACLs applied on a service-policy
- Full ACL compilation of standby unit is occurred (e.g. after reload)
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Bug Details Include

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  • Status
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