Bug ID 691498: Connection failure during iRule DNS lookup can crash TMM

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3

Fixed In:
14.0.0, 13.1.0.4, 12.1.3.2

Opened: Oct 30, 2017
Severity: 2-Critical

Symptoms

The TMM crashes in the DNS response cache periodic sweep.

Impact

The TMM cores and automatically restarts, Traffic disrupted while tmm restarts.

Conditions

The DNS resolver connection fails after a successful lookup response is cached. This has been reproduced with a failure due to a lost route. Other failures such as down ports do not cause a crash.

Workaround

No known workaround.

Fix Information

The reference counting of the resolver connection was fixed.

Behavior Change