Bug ID 521408: Incorrect configuration in BigTCP Virtual servers can lead to TMM core

Last Modified: Oct 01, 2018

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
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, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6, 11.5.3 HF2

Opened: May 05, 2015
Severity: 3-Major

Symptoms

An incorrect configuration on an irule associated to a BigTCP virtual server can lead to TMM to core.

Impact

Traffic disrupted while tmm restarts.

Conditions

The following circumstances are needed: - BigTCP Virtual server - FastL4 profile with syncookies enabled. - Invalid iRule that will fail to execute, on LB_FAILED - Syncookie currently activated in that moment.

Workaround

Correct or remove the irule event and coring will no longer occur.

Fix Information

TMM now correctly handles the specific scenario to no longer core.

Behavior Change