Bug ID 456859: Hardware compression might cause excessive memory consumption on 2000s/2200s (C112) and 4000s/4200v (C113)

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 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

Fixed In:
11.6.0, 11.5.1 HF6, 11.4.1 HF6

Opened: Apr 11, 2014
Severity: 3-Major
Related AskF5 Article:


Hardware compression might cause excessive memory consumption and eventual tmm crash as it exhausts available memory.


tmm crashes, drops core, high memory consumption indicated. Traffic disrupted while tmm restarts.


This occurs on the BIG-IP 2000s/2200s (C112) and 4000s/4200v (C113) platforms using hardware compression being used with greatly varying payload (xbuf) lengths directed at compression.


Do not use hardware compression.

Fix Information

Interface to hardware compression has improved allocation strategy.

Behavior Change