Last Modified: Jul 13, 2024
Affected Product(s):
BIG-IP GTM, LTM
Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1
Fixed In:
11.6.1 HF1
Opened: Sep 22, 2015 Severity: 3-Major
A TCL error, such as referencing an undefined variable, in a DNS_RESPONSE iRule event can cause a tmm crash. This can occur on a UDP listener with a DNS profile without datagram load balancing enabled. A DNS_REQUEST event, with any content, on the same listener is also required.
Traffic disrupted while tmm restarts.
All of the following: UDP listener with DNS profile without datagram load balancing. A TCL error, such as referencing an undefined variable, in a DNS_RESPONSE iRule event. A DNS_REQUEST iRule event with any content.
Either add datagram load balancing to the listener or correct the TCL errors that lead to the problem.
The TCL error handling is now processed asynchronously which prevents the problem from occurring.