Bug ID 616008: TMM core may be seen when using an HSL format script for HSL reporting in PEM

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.1.0,,,

Fixed In:
14.0.0,, 13.0.1,, 11.6.3

Opened: Sep 13, 2016
Severity: 2-Critical
Related AskF5 Article:


TMM core resulting in potential loss of service.


Traffic disrupted while tmm restarts.


Requires a PEM HSL reporting action with an HSL format script against a virtual server.


In an iRule against the virtual server, set a Tcl variable in the first line after an iRule event. Unset the same Tcl variable in the last line of the iRule event.

Fix Information

TMM core no longer occurs when using an HSL format script for HSL reporting in PEM.

Behavior Change