Bug ID 535101: Connections to LSN pools in PBA mode may cause tmm core if used in conjunction with udp_gtm_dns profile.

Last Modified: May 29, 2024

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

Known Affected Versions:
11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.1.0, 12.0.0 HF3, 11.6.1

Opened: Jul 24, 2015

Severity: 2-Critical

Related Article: K13552009


LSN configured in PBA mode can cause tmm to core if a connection needs to obtain resources from a remote tmm process. This occurs most frequently during heavy load or when there is a small translation space(low number of translation addresses) configured on the PBA lsnpool.


Traffic disrupted while tmm restarts.


- LSN with PBA mode configured. - udp_gtm_dns profile configured on the virtual server handling traffic. - Heavy traffic or small translation space.


Remove udp_gtm_dns profile from the virtual server, and replace it with fast L4.

Fix Information

LSN pool configured with PBA mode no longer crashes with heavy load and udp_gtm_dns profile configured.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips