[Samba] samba 4.4rcx WINS nsswitch module

[Rowland penny]

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, barış 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