Bug ID 421909: TMM crash, due to memory-pool access without memory barriers

Last Modified: Jul 12, 2023

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

Known Affected Versions:
11.3.0, 11.4.0

Fixed In:
11.5.0, 11.4.0 HF3, 11.3.0 HF6

Opened: May 27, 2013

Severity: 2-Critical


Rare condition where multiple TMM threads are accessing the same memory-pool, can cause memory corruption, leading to TMM crash.


Traffic disrupted while tmm restarts.


Bad synchronization between threads, rarely triggered under heavy traffic activity.



Fix Information

AVR has been optimized to prevent possible memory corruption and crashes.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips