Bug ID 642562: TMM may crash with a very high number of concurrent TCP connections

Last Modified: May 01, 2019

Bug Tracker

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

Known Affected Versions:
13.0.0, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5

Fixed In:
13.0.0 HF1

Opened: Jan 31, 2017
Severity: 3-Major

Symptoms

TMM may crash with a very high number of concurrent connections (e.g., 30 million).

Impact

Traffic disrupted while tmm restarts.

Conditions

This happens if BIG-IP has a lot of concurrent connections and encounters HSB ring drops. At that time if ICMP monitors are configured, then LTM will QoS promote those ICMP monitor flows and if those are for the same endpoints, then tmm might crash.

Workaround

None.

Fix Information

TMM no longer crashes with a very high number of concurrent TCP connections.

Behavior Change