[Samba] Bind9 9.18.28 crashes after loading AD DNS Zone

[Rowland Penny]

On Fri, 26 Jul 2024 08:38:58 +0200
Matthias Kühne | Ellerhold Aktiengesellschaft via samba
<samba at lists.samba.org> wrote:

> Hello lovely samba-people,
> 
> this morning all of our DCs (debian bookworm) upgraded their bind9 
> packages to 9.18.28 (from 9.18.24). Afterwards the named service
> would not come up successfully and crash after loading the DLZ:
> 
> Jul 26 07:32:12 rad-1.ad.ellerhold.lan named[1903]: sizing zone task 
> pool based on 64 zones
> Jul 26 07:32:12 rad-1.ad.ellerhold.lan named[1903]: Loading 'AD DNS 
> Zone' using driver dlopen
> Jul 26 07:32:13 rad-1.ad.ellerhold.lan named[1903]: free(): invalid
> size Jul 26 07:32:13 rad-1.ad.ellerhold.lan systemd[1]:
> named.service: Main process exited, code=dumped, status=6/ABRT
> Jul 26 07:32:13 rad-1.ad.ellerhold.lan systemd[1]: named.service:
> Failed with result 'core-dump'.
> 
> This was rather bad, because all of our DC did update at the same
> time and weve lost all DNS abilities... Downgrading to 9.18.24 fixes
> the issue and named works again.
> 
> I guess this crash happens because of the Samba DLZ? Were currently
> at Samba version 2:4.20.2+dfsg-7~mjt-deb12 .
> 
> Is this issue known? 

Yes

> Can I somehow help to diagnose this?

I can tell you how to fix it, never mind diagnose it ;-)

See here:

https://lists.samba.org/archive/samba/2024-July/249371.html

Rowland