Bug ID 669645: tmm crashes after LSN pool member change

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP CGN(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, 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, 13.0.1

Fixed In:
13.1.0, 12.1.4

Opened: Jun 16, 2017
Severity: 2-Critical
Related AskF5 Article:


Changing LSN pool members while processing traffic may cause tmm to crash.


When tmm crashes, traffic processing will stop until tmm restarts. Note that this can occur, even if the change was on a high-availability peer unit and config-sync has taken place.


-- Changing, using, or removing an LSN pool. -- Traffic is being processed.


Recommend to change LSN pool members during a maintainence window with low traffic or ideally to use an HA pair with a standby unit for implementing configuration changes on live traffic.

Fix Information

tmm no longer crashes when changing LSN pool members while processing traffic.

Behavior Change