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: Apr 24, 2024

Affected Product(s):
BIG-IP AFM(all modules)

Known Affected Versions:
15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 16.0.0,, 16.0.1,,, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,,

Fixed In:
17.0.0, 15.1.10

Opened: Nov 10, 2021

Severity: 2-Critical


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.


Traffic is disrupted while TMM restarts.


-- 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.


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


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips