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: Mar 12, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP CGN(all modules)

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 12.0.0, 12.0.0 HF1, 12.0.0 HF2

Fixed In:
12.1.0, 12.0.0 HF3, 11.6.1

Opened: Jul 24, 2015
Severity: 2-Critical
Related AskF5 Article:
K13552009

Symptoms

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.

Impact

Traffic disrupted while tmm restarts.

Conditions

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

Workaround

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