Bug ID 1060833: After handling a large number of connections with firewall rules that log or report translation fields or server side statistics, TMM may crash.

Last Modified: Jan 20, 2023

Bug Tracker

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

Known Affected Versions:
15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3

Fixed In:
17.0.0

Opened: Nov 10, 2021
Severity: 2-Critical

Symptoms

TMM crashes. The 'virt_cnt' column in the tmctl 'string_cache_stat' table continues to grow over time, and diverges significantly from the 'phys_cnt' column.

Impact

Traffic is disrupted while TMM restarts.

Conditions

-- Enforced AFM firewall policies configured in multiple contexts (global, route domain, virtual server) -- Large number of connections that matches rules in multiple contexts -- AFM configured in at least one of the following ways: --+ Stats collection enabled and collecting server-side stats enabled. Stats collection is enabled by default. Collecting server-side statistics ("security analytics settings acl-rules { collect-server-side-stats }") is not enabled by default. --+ ACL logging enabled, and the logging of translation fields enabled.

Workaround

Disable logging and reporting of server-side information in AFM firewall ACLs. After making these changes, it may be necessary to restart TMM once.

Fix Information

N/A

Behavior Change