Bug ID 934241: TMM may core when using FastL4's hardware offloading feature

Last Modified: Sep 13, 2023

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

Known Affected Versions:,, 16.0.0,, 16.0.1,,

Fixed In:

Opened: Aug 07, 2020

Severity: 1-Blocking


TMM cores.


TMM cores and the system cannot process traffic. Traffic disrupted while tmm restarts.


FastL4's hardware offloading is used. Because the error is an internal software logic implementation, there is no direct specific configuration that triggers this error condition. A quick traffic spike during a short period of time makes it more likely to occur.


Disable PVA/EPVA on all FastL4 profiles

Fix Information

Fix the internal logic error.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips