named giving invalid argument errors since upgrading to Ubuntu 18.04

Bug #1800289 reported by Jon Schewe
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

I have a server running a name server for a private domain and forwarding for all other lookups. The system was running fine and not reporting errors with Ubuntu 16.04. Once I upgraded to 18.04 I started getting regular errors like those below.

Oct 27 05:14:36 eggplant named[2485]: 27-Oct-2018 05:14:36.266 general: error: ../../../../lib/isc/unix/socket.c:2135: unexpected error:
Oct 27 05:14:36 eggplant named[2485]: 27-Oct-2018 05:14:36.349 general: error: internal_send: Invalid argument

The server is has both IPv4 and IPv6 addresses. It is running IPv4 NAT and does IPv6 routing for my home network.

The nameserver is doing lookups properly, but keeps reporting these errors. I have been unable to gather any additional information as to what is causing this.

What debugging options should I try enabling to aide in resolving this issue?

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