Bug ID 421768: TMM core during compression under heavy usage and memory pressure

Last Modified: Apr 10, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP None(all modules)

Known Affected Versions:
11.2.1, 11.3.0, 11.4.0

Fixed In:
11.4.1, 11.4.0 HF3, 11.3.0 HF6, 11.2.1 HF11

Opened: May 23, 2013
Severity: 2-Critical
Related AskF5 Article:


Under periods of heavy traffic load, on fully-provisioned systems with little free memory and compression and/or encryption enabled, TMM may core and the BIG-IP appliance may fail over.


Traffic disrupted while tmm restarts.


This issue can occur on BIG-IP 4000-series or 2000-series appliances that are under heavy traffic or other load resulting in high memory usage, with compression and/or encryption enabled.



Fix Information

Fixed a TMM SIGSEGV crash that can occur on BIG-IP 4000-series or 2000-series platforms that are low on memory and processing heavy amounts of compression and/or encrypted traffic.

Behavior Change