Bug ID 612874: iRule with FLOW_INIT stage execution can cause TMM restart

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2

Fixed In:
13.0.0, 12.1.2

Opened: Aug 25, 2016
Severity: 2-Critical


If you have an iRule that has FLOW_INIT stage execution, it is likely to result in random TMM crashes.


Traffic disrupted while tmm restarts.


iRule that has FLOW_INIT stage action in it. The FLOW_INIT stage iRule could be executed either because it was attached to a Virtual Server or configured on an AFM ACL Rule.


Do not use iRule with FLOW_INIT action. Other stage iRules does not cause this problem.

Fix Information

Memory allocation and release during iRule FLOW_INIT execution was not handled right in a specific scenario, which was corrected.

Behavior Change