Bug ID 473759: Unrecognized DNS records can cause mcpd to core during a DNS cache query

Last Modified: Nov 07, 2022

Affected Product(s):
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, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.2, 11.4.1 HF9, 11.2.1 HF16

Opened: Jul 31, 2014

Severity: 3-Major

Related Article: K16586


mcpd cores during a DNS cache record query if a DNS record with an unknown type is in the cache. mcpd attempts to translate the record's type into a text string, but ends up with a NULL pointer instead.


mcpd cores, causing either a failover (if there is a standby unit) or an outage while mcpd restarts (if there is no standby unit).


A DNS record with a type unknown by mcpd must exist in the DNS cache during the query.



Fix Information

Unrecognized DNS records no longer cause mcpd to core during a DNS cache query.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips