Bug ID 428163: Removing a DNS cache from configuration can cause TMM crash

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.5.2, 11.5.2 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.5.3, 11.6.0 HF5, 11.5.3, 11.4.1 HF9

Opened: Aug 16, 2013
Severity: 3-Major
Related Article:
K16523

Symptoms

Removing a DNS cache from the configuration with outstanding packets on the server side can cause a TMM crash if those responses time out after the resolver removed.

Impact

Traffic disrupted while tmm restarts.

Conditions

This occurs with DNS traffic in progress when removing a configured DNS cache from the configuration.

Workaround

This occurs with DNS traffic in progress. Disabling the listener using that cache and waiting 60 seconds before removing the cache prevents this from occurring.

Fix Information

Deleting a cache resolver no longer results in outstanding packet issues.

Behavior Change