Bug ID 912001: TMM cores on secondary blades of the Chassis system.

Last Modified: May 29, 2024

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 16.0.0,, 16.0.1,

Fixed In:
16.1.0,, 15.1.4,,

Opened: May 27, 2020

Severity: 3-Major


When using DNS Cache on chassis systems with a forward zone pointing at a self IP for communication with local BIND, the following assert triggers: tmm_panic (... "../net/loop.c:572: %sIDX set on listener%s") at ../lib/stdio.c:1307


TMMs on secondary blades core dump. Traffic disrupted while tmm restarts.


-- Chassis system is used. -- Secondary TMMs core dump. -- Primary works as expected.


1) Create another virtual server with a DNS profile to use configured to use the local bind server. 2) Set the forward zones to point to that virtual server instead of the self IP as name servers.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips