samba - Aug 2021 - ../../source4/libcli/dgram/browse.c:106(dgram_mailslot_browse_parse) followed by NT_STATUS_BUFFER_TOO_SMALL

On Tue, 2021-08-10 at 18:13 +0100, Rowland Penny via samba
wrote:
> On Tue, 2021-08-10 at 18:15 +0200, Bas W. Auer via samba wrote:
> > Hi all,
> > 
> > I have a question about an error I get after upgrading SAMBA 4.11.6
> > to 
> > 4.12.0 and further.
> > 
> > First a little history up front.
> > 
> > I had a Centos 7 SAMBA 4.11.6 server running, but because of the
> > EOL
> > of 
> > Centos 7 and the strange shift of RedHat with Centos I couldn't
> > upgrade 
> > SAMBA and couldn't upgrade Centos, so I decided to switch to my 
> > favourite OS, Ubuntu.
> > 
> > So I created an Ubuntu 20.04 server, and installed Samba 4.11.6
> > with
> > the 
> > same configure string. (Followed the samba wiki by the letter)
> > 
> > Then I joined this new machine to the Centos 7 SAMBA AD again
> > following 
> > the wiki page. Everything turned out perfectly. Brought both
> > machines
> > in 
> > sync, again following the samba wiki. Everything worked as
> > supposed.
> > 
> > Then I demoted the old Centos 7 SAMBA AD and removed all pointers
> > to 
> > that machine on the new Ubuntu 20.04 SAMBA AD. (Again following
> > the 
> > samba wiki)
> > 
> > The demotion worked, the old machine I shutdown and I started
> > testing. 
> > Everything works like a charm. No errors, I can create users, dns 
> > entries etc.
> > 
> > After a few days of working with this new setup, still no errors,
> > I 
> > decided that I could and should upgrade SAMBA to the newest
> > version.
> > Not 
> > with a bang, but in steps. Going from 4.11.6 to 4.12.0 etc to
> > finally 
> > end with the latest version in a few weeks.
> > 
> > The upgrade went perfect (I think) and everything started as
> > supposed 
> > to. Again I could create a user, add DNS entries, remove them etc.
> > No 
> > errors or what so ever. Until 10 minutes after (re)starting SAMBA
> > 4.12.0.
> > 
> > I get the following errors after approx. 10 minutes after staring
> > and
> > it 
> > repeats every +/- 10 minutes.
> > 
> > ../../source4/libcli/dgram/browse.c:106(dgram_mailslot_browse_parse
> > )
> > Failed to parse browse packet of length 32:
> > NT_STATUS_BUFFER_TOO_SMALL
> > 
> > I looked every where for an answer, but I couldn't find any answer
> > that 
> > helped.
> > 
> > I probably missed something in the upgrade, but I don't know where
> > to 
> > look, as I think I looked everywhere.
> > 
> > I hope someone in this community can help me.
> > 
> 
> Last time I remember seeing things like this on a DC, it was using
> the
> experimental MIT kerberos. Where are you getting Samba from ?
> 
> Rowland
> 
And then I noticed the word 'configure', so it looks like you are
building Samba yourself, if so, please post your configure line and the
list of packages installed to build Samba.

Rowland

To answer your questions:

I took the versions from https://download.samba.org/pub/samba/stable/

And this is my configure line to build:

./configure --mandir=/usr/share/man --enable-debug --with-syslog

I never used the MIT Kerberos settings. (As far as I can remember)

PS. I hope I respond in the correct way because it's the first time I 
use a mail in list

Best regards, Met vriendelijke groet,

Bas Auer
+31 (0)6 46060623