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

Last Modified: Sep 13, 2023

Affected Product(s):
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, 13.1.5

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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips