I've got a bind configuration that's been around for many years at
this point.  Noticed today that named had failed to restart at some
time in the past.  Nothing in /var/log/bind after it had shut down,
nothing visible in systemctl status, nor journalctl -xeu named.service
apart from note of a bad return code.  Running with named -g found it
complaining about these lines in my named.conf.local:

zone "com" { type delegation-only; };
zone "net" { type delegation-only; };

I don't have a memory of why or when I added these (maybe when bad
lookups suddenly were redirecting to advertising?), but
https://bind9.readthedocs.io/en/v9.18.18/notes.html mentions the
delegation-only option being deprecated.  So, not great that it was
hard to debug, but it's probably peculiar to my configuration.  I
thought it was worth filing a bug in any case anyone else runs across
this.

My fix was simply to remove those two lines since they do not
appear to be relevant any more.  If support for delegation-only has
indeed been removed, it seems a little strange it's not in the bind
release notes etc.

We believe that the bug you reported is fixed in the latest version of
bind9, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1054314@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Ondřej Surý <ondrej@debian.org> (supplier of updated bind9 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Thu, 17 Apr 2025 18:49:10 +0200
Source: bind9
Architecture: source
Version: 1:9.20.8-2
Distribution: unstable
Urgency: medium
Maintainer: Debian DNS Team <team+dns@tracker.debian.org>
Changed-By: Ondřej Surý <ondrej@debian.org>
Closes: 995310 1054314
Changes:
 bind9 (1:9.20.8-2) unstable; urgency=medium
 .
   * Validate configuration file before service restart
     (Closes: #995310, #1054314)
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