samba - Aug 2018 - dns terminated with signal 11

Hi,

I did a big mistake. Since 2 weeks my upgrade samba-ad works perfect. 

Today I tried (I know it was dump) to add "www" as CNAME Alias Name
(FQDN: www.example.com) to my DNS..The reason I did this was to fix my
dns-problem (Domain name and public website have the same name
("example.com")).

I deleted this entry after 5min.

But after all of this my dns gets terminated randomly. As you can see via
"systemctl status samba-ad-dc":


samba-ad-dc.service - Samba AD Daemon
   Loaded: loaded (/lib/systemd/system/samba-ad-dc.service; enabled; vendor
preset: enabled)
   Active: active (running) since Wed 2018-08-29 09:59:35 CEST; 1h 29min ago
--
Aug 29 11:22:15 server samba[8649]:   Child 8664 (dns) terminated with signal 11

after restarting the service everything works fine...sometimes for 10min or as
you can see above 1h 30min..

Is there maybe any cache I can clean or any log I can check?

Thanks!

On Wed, 2018-08-29 at 11:40 +0200, basti mueller via samba
wrote:
> Hi,
> 
> I did a big mistake. Since 2 weeks my upgrade samba-ad works
> perfect. 
> 
> Today I tried (I know it was dump) to add "www" as CNAME Alias
Name
> (FQDN: www.example.com) to my DNS..The reason I did this was to fix
> my dns-problem (Domain name and public website have the same name
> ("example.com")).
> 
> I deleted this entry after 5min.
> 
> But after all of this my dns gets terminated randomly. As you can see
> via "systemctl status samba-ad-dc":
> 
> 
> samba-ad-dc.service - Samba AD Daemon
>    Loaded: loaded (/lib/systemd/system/samba-ad-dc.service; enabled;
> vendor preset: enabled)
>    Active: active (running) since Wed 2018-08-29 09:59:35 CEST; 1h
> 29min ago
> --
> Aug 29 11:22:15 server samba[8649]:   Child 8664 (dns) terminated
> with signal 11
> 
> after restarting the service everything works fine...sometimes for
> 10min or as you can see above 1h 30min..
> 
> Is there maybe any cache I can clean or any log I can check?
Can you first confirm if this was fixed by our recent security upate:
CVE-2018-1140

If this still happens with Samba 4.8.4 or later please let us know full
details to reproduce via our security contact address, as that would be
a different issue.

Thanks!

Andrew Bartlett

-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba