Bug ID 683631: TMM crashes during stress test

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:

Opened: Sep 14, 2017
Severity: 2-Critical


During stress/load testing, with a large number of connections which triggers flow sweeping, TMM restarts.


Traffic disrupted while tmm restarts.


A large number of connections are seen, which triggers an expansion of the connflow hash table at the same time the connflow sweeper is active.


There is no workaround at this time.

Fix Information

Connflow removal from the internal hash table is deferred until the entire bucket is processed.

Behavior Change