Bug ID 567167: HTTP Fallback with complex iRules may cause the TMM to crash

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:

Opened: Jan 12, 2016
Severity: 2-Critical


When HTTP goes into fallback mode, and multiple iRule events are running it is possible that HTTP aborts due to unexpected state transitions. If more than one abort occurs for the same flow, it is possible that the TMM may crash.


Traffic disrupted while tmm restarts.


HTTP Fallback is triggered and outstanding iRules or other Profiles cause unexpected conditions to happen to the HTTP filter. The unexpected events happen more than once for a given flow.



Fix Information

In complex situations involving HTTP Fallback, the TMM is more robust to unexpected events occurring.

Behavior Change