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

Last Modified: Apr 10, 2019

Bug Tracker

Affected Product:  See more info
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 AskF5 Article:
K15713

Symptoms

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

Impact

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

Conditions

Occurs when applying TSO to packets.

Workaround

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