Bug ID 431618: SIP Filter crash in egress because the ingress pcb is already released

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF2

Opened: Sep 24, 2013
Severity: 3-Major
Related AskF5 Article:


TMM crashes, and in the core dump file, you can find the following information: 1. cf->flow_type should be FLOW_SERVERSIDE(0x80) 2. sip->pcb should be null (indicating that the client side pcb is released) i.e. the server side flow is accessing the client pcb which is released.


TMM core's


The PCB on the client flow is released and the server flow tries to access it



Fix Information

Fixed a relatively rare coring condition where the SIP filter would access memory that was already freed.

Behavior Change