[Samba] winbind causes Linux to lockup when connectivity to AD is lost (subject line edited for clarity)

Matthew J. Salerno vagabond_king at yahoo.com
Fri Oct 16 16:54:39 MDT 2009

Your  /etc/nsswitch.conf looks correct to me.  For services like ssh, you should just disable ptr lookups (VerifyReverseMapping no).  Regarding winbind, do you have any services or processes running on the box as a domain user?  Perhaps there is a timeout setting for krb and winbind.  I don't recall seeing one for winbind, but I would imagine that there is one for kerberos.  Have you bumped up the debugging and purposefully caused an ad failure (ifdown or bad route) ?  Have you had the console open and watched top to see if it's a processes consuming to much cpu?  What kind of troubleshooting have you done?  and what are the results?

----- Original Message ----
From: "admin at ateamonsite.com" <admin at ateamonsite.com>
To: admin at ateamonsite.com
Cc: samba at lists.samba.org; Jeremy Allison <jra at samba.org>
Sent: Fri, October 16, 2009 3:59:45 PM
Subject: Re: [Samba] winbind causes Linux to lockup when connectivity to AD is lost (subject line edited for clarity)

Ok I am not hearing replies back - I dont want this issue to be swept under
the rug. 

It has been a issue for me since SuSE 10.1 + samba-3.0.30-0.1.112 even..
I know now that the commands I was telling you all access UN/PW info such
as LS or MAN etc, to see if you have permission to run them? IDK I am

BUT - if winbind is really caching and the connection is lost, then this
should be a non-issue as you say.

Well here is my nsswitch.conf:

cat /etc/nsswitch.conf

passwd: compat winbind
group:  compat winbind

networks:       files dns

services:       files
protocols:      files
rpc:    files
ethers: files
netmasks:       files
netgroup:       files
publickey:      files

bootparams:     files
automount:      files
aliases:        files

hosts:  files dns
shadow: compat

Isn't this set up right? ;-)

So, famously when DNS is down, crap like SSH and NFS take unreasonable
amounts of time and cause system hangs in linux. This is what I've been
told, and I can accept that.
Since DNS is hosted on the AD server, when that server goes down, SSH, and
even local login hang for extremely long amounts of time - im talking more
than 10 minutes... then fail.

In Windows (im sorry Im about to compare 2 operating systems) this is a non
issue and you can use the machine even if the networking is hosed or you
cant talk to the AD.


BUMP! :-)

On Wed, 14 Oct 2009 16:51:10 -0600, <admin at ateamonsite.com> wrote:
> Hopefully that isn't a bad thing! haha 
> Thanks! 
> On Wed, 14 Oct 2009 15:44:54 -0700, Jeremy Allison <jra at samba.org> wrote:
>> On Wed, Oct 14, 2009 at 04:02:41PM -0600, admin at ateamonsite.com wrote:
>>> Hi Jeremy,
>>> > Sorry, didn't look too closely at your winbindd issue.
>>> > winbindd will cache all information to allow disconnected
>>> > operation (we made this work perfectly at SuSE), so there
>>> > certainly shouldn't be a problem with a loss of connection to a DC.
>>> I am sorry to report that I am in fact using SuSE, and this problem is
>>> very
>>> easy to reproduce if I power off my AD domain, then wait (I guess) 10
>>> minutes - then try and ssh to my Linux box. There is no way to log into
>>> the
>>> box. 
>> Ok, then I'm going to hand you over to the SuSE Samba Team
>> maintainers on this list (sorry :-).
>> Jeremy.
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