Bug ID 905557: Logging up/down transition of DNS/GTM pool resource via HSL can trigger TMM failure

Last Modified: Jul 22, 2021

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1

Fixed In:
16.0.0, 15.1.2, 14.1.4

Opened: May 01, 2020
Severity: 2-Critical


A TMM daemon logs a SIGSEGV error, halts, and then be restarted.


Traffic disrupted while tmm restarts.


-- A BIG-IP system configured to perform DNS/GTM Global Server Load Balancing. -- High Speed Logging (HSL) is configured. -- Multiple HSL destinations are configured. -- The enabled HSL settings include 'replication'. -- At least one HSL destination is up. -- At least one HSL destination is down. -- A pool resource changes state from up to down.


Configure HSL with only a single log destination.

Fix Information


Behavior Change