Bug ID 430552: Wrong connection flow handling CMP response may cause TMM to core

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF6, 11.4.0 HF4, 11.3.0 HF8

Opened: Sep 13, 2013
Severity: 1-Blocking
Related AskF5 Article:


On rare occasions, a race condition may allow the wrong connection flow to handle Clustered Multiprocessing (CMP) responses. The CMP messages for flows that are quickly created and destroyed may match a flow that was already destroyed.


Traffic disrupted while tmm restarts.


This issue can occur on any device using CMP messaging.



Fix Information

Added handling to protect against attributing a CMP message to the wrong flow.

Behavior Change