Bug ID 842989: PEM: tmm could core when running iRules on overloaded systems

Last Modified: Mar 26, 2020

Bug Tracker

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,,, 13.1.3,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,,, 14.1.2,,,, 15.0.0, 15.0.1,,, 15.1.0

Opened: Oct 25, 2019
Severity: 3-Major


When sessions usage iRules are called on an already overloaded system it might crash. This is not unexpected as happened once when tmm is pinned at 100% for very long time before the crash.


Tmm restarts. Traffic disrupted while tmm restarts.


Session iRule calls on heavily overloaded BIG-IP systems.


Reduce the load on tmm or modify the optimize the irule. Note that BIG-IP systems are not expected to run at 100% load for an extended period of time.

Fix Information


Behavior Change