[Samba] samba 4.4rcx WINS nsswitch module

Rowland penny rpenny at samba.org
Mon Apr 4 15:49:24 UTC 2016

On 04/04/16 14:53, L.P.H. van Belle wrote:
> Rowland,
> Can you try again but first upgrade libnss to libnss 3.23at least.
> Greetz,
> Louis
>> -----Oorspronkelijk bericht-----
>> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Rowland penny
>> Verzonden: maandag 4 april 2016 15:31
>> Aan: Andrew Bartlett; samba at lists.samba.org
>> Onderwerp: Re: [Samba] samba 4.4rcx WINS nsswitch module
>> On 04/04/16 10:35, Andrew Bartlett wrote:
>>> On Thu, 2016-03-24 at 10:13 +0000, Rowland penny wrote:
>>>> On 23/03/16 13:05, Rowland penny wrote:
>>>>> On 23/03/16 12:53, bar???? tombul wrote:
>>>>>> cd /usr/lib64/security
>>>>>> rm pam_smbpass.so
>>>>>> rm pam_winbind.so
>>>>>> rm /lib64/libnss_wins.so*
>>>>>> ln -s /usr/local/samba/lib/libnss_wins.so.2
>>>>>> /lib64/libnss_wins.so.2
>>>>>> ln -s /usr/local/samba/lib/libnss_wins.so.2 /lib64/libnss_wins.so
>>>>>> reboot
>>>>>> # ping google.com <http://google.com>
>>>>>> Segmentation fault
>>>>> Strange, as I showed it works for me. Samba 4.4.0 is now out, do
>>>>> you
>>>>> feel up to compiling this and trying ping again ?
>>>>> If you do, check that you have all the packages for your OS shown
>>>>> here:
>>>>> https://wiki.samba.org/index.php/Operating_system_requirements/Depe
>>>>> ndencies_-_Libraries_and_programs
>>>>> Rowland
>>>> OK, so I setup a VM and installed Centos 7 on it, installed the
>>>> packages
>>>> as per the wiki and compiled 4.4.0. I then found I didn't have
>>>> pam_winbind.so
>>>> Compared what the wiki said to install for Centos with what I
>>>> normally
>>>> install for Devuan and installed the difference, recompiled again, I
>>>> now
>>>> had pam_winbind.so
>>>> Set up Samba and joined it to the domain and everything works until
>>>> you
>>>> add the word 'wins' to the hosts line in /etc/nsswitch.conf.
>>>> I now get this:
>>>> ping -c1 google.com
>>>> Segmentation fault
>>>> I have disabled selinux, turned off the firewall, it doesn't matter
>>>> if
>>>> the Samba Deamons are running or not.
>>>> All I can find that might be relevant is this:
>>>> http://permalink.gmane.org/gmane.linux.debian.devel.systemd/8842
>>>> I cannot get valgrind or gdb to give any result, they both fail.
>>>> I am becoming more convinced that this has nothing to do with Samba
>>>> and
>>>> as I normally don't use Centos, I am giving up.
>>> If you follow the same steps on any other OS (Debian is what I'm
>>> interested in most), can you make it fail?
>>> Is there a Samba version where this does work?  Can you git bisect
>>> between the two versions?
>>> This is one of the few reported crash issues we have with 4.4 so far,
>>> and I'm keen that we track it down.  I really appricicate you
>>> reproducing this much.
>>> BTW, the same is in bugzilla as
>> https://bugzilla.samba.org/show_bug.cgi?id=11775
>>> Thanks,
>>> Andrew Bartlett
>> Hi Andrew, I have updated a domain member to 4.4.0 running on Devuan
>> Jessie and I cannot get 'ping' to segfault, it only happens for me on
>> Centos (and presumably RHEL) 7
>> I cannot say whether this will happen on Debian Jessie, as I will not
>> use systemd.
>> In fact it could be that systemd is the culprit here and not Samba, but
>> I have no way of knowing, because *I will not use systemd*
>> I could not find any way to get valgrind & gdb to give up any reason why
>> 'ping' fails on C7, this seems to be down to the way Centos works and I
>> get the feeling that I would have to re-compile large amounts of Centos
>> just to get the debug tools to work.
>> Rowland
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Hmm, that would need me to get libnss3 from SID, from my experience, 
this is likely to need other things updating, so, no I wouldn't like to 
try again :-D

Having said that, Devuan Jessies version is 3.17.2-1.1+deb8u2 and from 
what a quick google, Centos 7 uses 3.19.1

I don't think it is an nss problem anyway, I normally use Devuan and 
ping doesn't segfault on that, I only got it to segfault on centos 7 and 
as I never normally use this distro and couldn't easily find a way to 
debug the issue, I gave up, perhaps somebody, who normally only uses 
Centos, would care to give it a whirl ?


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