Bug ID 458564: TMM crash using cloned pool with packet marked for TSO

Last Modified: Nov 22, 2021

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.4.0, 11.4.1

Fixed In:
11.4.1 HF6

Opened: Apr 23, 2014

Severity: 3-Major

Related Article: K16399


TMM can crash if the cloned pool doesn't support TCP segmentation offload (TSO), but receives a packet that is marked for TSO.


Traffic disrupted while tmm restarts.


If a virtual is configured with a clone pool, the original flow supports TSO and the cloned pool doesn't not support TSO, then a packet received on the original flow and is marked for TSO can cause a TMM crash when sent to the clone pool member.


To workaround this issue disable TSO. This can be done by modifying the DB variable tm.tcpsegmentationoffload: tmsh modify sys db tm.tcpsegmentationoffload value disable

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips