Bug ID 470994: Rarely, TMM may segfault when applying TSO to invalid packets

Last Modified: Nov 07, 2022

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

Known Affected Versions:
11.0.0, 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

Fixed In:
11.6.0, 11.5.1 HF6, 11.4.1 HF9

Opened: Jul 09, 2014

Severity: 3-Major

Related Article: K15713


You might see TMM segfaults when the system attempts to apply TSO processing to an outbound packet that does not need it.


TMM crashes and the system fails over. This occurs rarely.


Occurs when applying TSO to packets.


You can work around this by disabling TCP segmentation offload. To do so, modify the tm.tcpsegmentationoffload value using the following command: tmsh modify sys db tm.tcpsegmentationoffload value disable.

Fix Information

TMM now correctly applies TSO processing to outbound packets, so TMM no longer segfaults.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips