Ubuntu
exim4 package

Bug #26820
Comment #13

Comment 13 for bug 26820

Revision history for this message

Debian Bug Importer (debzilla) wrote on 2005-12-17:

#13

Message-ID: <email address hidden>
Date: Sat, 17 Dec 2005 16:45:32 +0100
From: Marc Haber <email address hidden>
To: Jeroen van Wolffelaar <email address hidden>
Cc: <email address hidden>, <email address hidden>
Subject: Re: Bug#342619: Possible exim retry bug (Re: master mail problems -- help needed)

On Sat, Dec 17, 2005 at 04:17:45PM +0100, Jeroen van Wolffelaar wrote:
> On Sat, Dec 17, 2005 at 04:07:51PM +0100, Marc Haber wrote:
> > On Fri, Dec 09, 2005 at 01:12:56AM +0100, Jeroen van Wolffelaar wrote:
> > > I'm quite sure it's an exim bug, but haven't quite nailed it yet. The
> > > bug has been witnessed positively both on master.d.o and on
> > > one mailserver I maintain. Interestingly, it doesn't seem to be IPv6
> > > related (or maybe there are two bugs).
> >
> > It might be DNS related. Can you comment about
> > http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20051212/msg00196.html
> > please?
>
> That sounds very much like the cause of this bug. It's also possible
> even for IPv4 issues like the one in my original bugreport, as also in
> that case, TTL's were distinct, and indeed, the situation could arrise
> that a DNS query would give only partial results in the additional
> section, because of the setup of the involved DNS servers.

I agree with that. I filed the message for exim-users before reviewing
your bug report, so I'll have to mention the possibility of this
happening in a v4-only setup later. But first I'll wait for Philip to
comment.

> So, it seems like the logic error is in that the additional DNS section
> is believed to be complete, which is not at all guaranteed to be true --
> it can be partial for any reason.

Right.

> Thanks a lot for finding the (IMHO) most logical cause of this bug,

Florian had a big part in this, we spent the better part of this
afternoon over DNS queries and DNS output on IRC. Without his help,
this wouldn't have been possible.

Greetings
Marc

Message-ID: <20051217154532.GH2620@torres.l21.ma.zugschlus.de>
Date: Sat, 17 Dec 2005 16:45:32 +0100
From: Marc Haber <mh+debian-packages@zugschlus.de>
To: Jeroen van Wolffelaar <jeroen@wolffelaar.nl>
Cc: 342619@bugs.debian.org, 342619-submitter@bugs.debian.org
Subject: Re: Bug#342619: Possible exim retry bug (Re: master mail problems -- help needed)

On Sat, Dec 17, 2005 at 04:17:45PM +0100, Jeroen van Wolffelaar wrote:
> On Sat, Dec 17, 2005 at 04:07:51PM +0100, Marc Haber wrote:
> > On Fri, Dec 09, 2005 at 01:12:56AM +0100, Jeroen van Wolffelaar wrote:
> > > I'm quite sure it's an exim bug, but haven't quite nailed it yet. The
> > > bug has been witnessed positively both on master.d.o and on
> > > one mailserver I maintain. Interestingly, it doesn't seem to be IPv6
> > > related (or maybe there are two bugs).
> > 
> > It might be DNS related. Can you comment about
> > http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20051212/msg00196.html
> > please?
> 
> That sounds very much like the cause of this bug. It's also possible
> even for IPv4 issues like the one in my original bugreport, as also in
> that case, TTL's were distinct, and indeed, the situation could arrise
> that a DNS query would give only partial results in the additional
> section, because of the setup of the involved DNS servers.