Bug ID 449569: TMM reports TMM thread (20) greater than max (16) in 20-core vCMP guest

Last Modified: Apr 28, 2025

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

Known Affected Versions:
11.3.0, 11.4.0

Opened: Feb 19, 2014

Severity: 2-Critical

Symptoms

The TMM might restart continuously and report 'TMM thread (20) greater than max (16)' in /var/log/tmm.

Impact

The TMM does not start, which prevents the system from going online or passing traffic.

Conditions

This issue occurs when a vCMP guest is deployed with more than 16 CPUs.

Workaround

You can use one of the following to workaround the issue: a) Lower the cores-per-slot attribute to a value of 16 or lower. b) Inside the affected guest, issue the commands: 'bigstart disable tmm', 'setdb tmm.threads 10', 'bigstart enable tmm', 'bigstart start tmm'.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips