Bug ID 475055: Core caused by incorrect accounting of I/O flows

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.0.0, 11.3.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3

Fixed In:
12.0.0, 11.6.0 HF4, 11.5.1 HF6, 11.4.1 HF9

Opened: Aug 08, 2014
Severity: 3-Major
Related AskF5 Article:


I/O flows for the Cavium Nitrox are not always added to the count- but are always subtracted correctly, causing an imbalance.


Incorrect accounting allowed the number of flows to drop below zero, triggering an assert and a core.


This occurs only on platforms using the Cavium Nitrox chip.



Fix Information

Resolved core caused by accounting miscalculation of Nitrox I/O flows

Behavior Change