Bug ID 495875: Connection limit on nodes causes TMM infinite loop and heartbeat failure with heavy traffic

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.5.0, 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, 11.5.10, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.2

Opened: Dec 10, 2014
Severity: 2-Critical
Related AskF5 Article:
K16204

Symptoms

TMM might experience an infinite loop when selecting an available node for load balancing under heavy traffic conditions.

Impact

This causes a 10-second TMM heartbeat failure and a SIGABRT in TMM. The device goes offline and traffic processing is disrupted.

Conditions

This occurs when the connection limit is specified for nodes, and there is heavy traffic.

Workaround

None.

Fix Information

Connection limit on nodes now works correctly, and no longer causes tmm to loop indefinitely with heavy traffic.

Behavior Change