[Samba] samba 4.4rcx WINS nsswitch module

[mathias dufresne]

Hi all,

I'm using 4.4.0rc2 manually compiled, running for a little bunch of weeks
on Centos 7.

samba --version
Version 4.4.0rc2-DGFiP-RedHat-01.el7

I did changed my nsswitch.conf.
I had:
hosts:      files dns
I have now:
hosts:      files wins dns

Once the change was done:
systemctl restart samba-ad

No issue.

So I ran ping and it segfaulted:
dc200:~# ping google.com
Segmentation fault
dc200:~# ping dc201
Segmentation fault
dc200:~# ping dc200
PING dc200.ad.dgfip.finances.gouv.fr (10.156.32.100) 56(84) bytes of data.
64 bytes from dc200.ad.dgfip.finances.gouv.fr (10.156.32.100): icmp_seq=1
ttl=64 time=0.021 ms
^C
--- dc200.ad.dgfip.finances.gouv.fr ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.021/0.021/0.021/0.000 ms
dc200:~#

My resolv.conf has a search set to my AD domain name, that's why I can ping
dc200 and dc201 without FQDN.

What I'm thinking about that:
DC200 on DC200 is declared into /etc/hosts and it can be pinged, resolving
process did not went through WINS.
All others pings segfaulted as they went through WINS resolving.

back to normal in my rnsswitch.conf and no more issue:
dc200:~# sed -e s/"files wins dns"/"files dns"/ -i /etc/nsswitch.conf
dc200:~# ping google.com
ping: unknown host google.com
dc200:~# ping dc201
PING dc201.ad.dgfip.finances.gouv.fr (10.156.32.101) 56(84) bytes of data.
64 bytes from dc201.ad.dgfip.finances.gouv.fr (10.156.32.101): icmp_seq=1
ttl=64 time=0.246 ms
^C
--- dc201.ad.dgfip.finances.gouv.fr ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.246/0.246/0.246/0.000 ms

All packages with "samba" in package name on that server are compiled
packages.

Hoping this could help.

Mathias

2016-03-22 13:17 GMT+01:00 barış tombul <bbtombul at gmail.com>:

> I would appreciate it if you can change the host value in the
> /etc/nsswitch.conf  file from  *hosts:*  to  *files wins dns * and try
> again by restarting the server, since the error occurs whenever I restart
> the server.
> However, If I change the host value which is  *hosts: * in the
> /etc/nsswitch.conf file to *files  dns wins *and restart the server
> everything runs perfectly, when the alignment of wins and dns value is
> reversed a problem occurs.
> Can you try this, I do not think I'm the only one subject to this
> situation.
>
> Best  Regards...
>
> 2016-03-22 12:50 GMT+02:00 Volker Lendecke <Volker.Lendecke at sernet.de>:
>
> > ==3135== Invalid read of size 8
> > ==3135==    at 0xC576915: __pthread_initialize_minimal (in /usr/lib64/
> > libpthread-2.17.so)
> > ==3135==    by 0xC575408: ??? (in /usr/lib64/libpthread-2.17.so)
> > ==3135==    by 0xFFF0007D3: ???
> > ==3135==    by 0x6D6F632E656C66: ???
> > ==3135==    by 0x535345535F474457: ???
> > ==3135==    by 0x313D44495F4E4F48: ???
> > ==3135==    by 0x4D414E54534F47FF: ???
> > ==3135==    by 0x5400736D656D3D44: ???
> > ==3135==    by 0x303174763D4D5244: ???
> > ==3135==    by 0x3D4C4C454853002F: ???
> > ==3135==    by 0x7361622F6E69622E: ???
> > ==3135==    by 0x4953545349480067: ???
> > ==3135==  Address 0x968 is not stack'd, malloc'd or (recently) free'd
> >
> > Hmm. This is not very informative. Can you start ping in gdb, and when
> > it crashes, do a "bt full"? Bonus points if you install debuginfo
> > packages for ping and libc.
> >
> > Volker
> >
> > --
> > SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
> > phone: +49-551-370000-0, fax: +49-551-370000-9
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> > http://www.sernet.de, mailto:kontakt at sernet.de
> >
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