Bug ID 489796: TMM cores when Woodside congestion control is used.

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5

Opened: Nov 10, 2014
Severity: 2-Critical
Related AskF5 Article:


In Woodside congestion control, the congestion window is used to calculate the minimum delay. During this calculation, if congestion window is 0, division by congestion window (0) causes a core during the calculation.


Traffic disrupted while tmm restarts.


The congestion window becomes 0.


Use another congestion control rather than Woodside.

Fix Information

A TMM crash bug when using Woodside congestion control has been fixed. The issue was a division by 0 bug.

Behavior Change