Bug ID 683631: TMM crashes during stress test

Last Modified: Nov 07, 2022

Affected Product(s):
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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips