[SSSD-users] Startup segfault loop of domain_be on Ubuntu 14.04

Jakub Hrozek jhrozek at redhat.com
Wed Jul 9 21:18:39 UTC 2014


On 09 Jul 2014, at 17:09, Chris Hartman <qrstuv at gmail.com> wrote:

> Hi guys,
> 
> Ubuntu 14.04 x86_64
> SSSD 1.11.5
> Active Directory backend
> 

Hi Chris,

thanks for reporting this issue. I think we have a bug in the dynamic DNS update code. Here are the last couple of lines before SSSD crashed:
(Wed Jul  9 10:10:39 2014) [sssd[be[sanedomain]]] [sdap_id_op_connect_step] (0x4000): reusing cached connection
(Wed Jul  9 10:10:39 2014) [sssd[be[sanedomain]]] [be_nsupdate_done] (0x0200): nsupdate child status: 0
(Wed Jul  9 10:10:39 2014) [sssd[be[sanedomain]]] [nsupdate_msg_create_common] (0x0200): Creating update message for realm [SANEDOMAIN.LOCAL].
(Wed Jul  9 10:10:42 2014) [sssd[be[sanedomain]]] [server_setup] (0x0400): CONFDB: /var/lib/sss/db/config.ldb

“server_setup” is the first function that gets executed after SSSD restarts, so the lines right before that indicate where SSSD was before the crash.

Is it possible to generate a core file? That would help debugging quite a lot. I realise the core file can contain private information, so feel free to send it to me directly. If that not acceptable either, generate a backtrace with “bt full” in a gdb session, then you can send a sanitised backtrace.

I think that the following option (in the domain section) should help you work around the problem:
dyndns_update = False

Please let us know if disabling the DNS update helped and if you can generate the core file.

Thanks again for the problem report!

> I've been experiencing this problem for a few weeks with no luck in troubleshooting it. During boot, the sssd_be process will continually spawn and crash due to a segfault. When it gets stuck in this loop, domain account login is almost impossible (local accounts still work).
> 
> I've attached sanitized logs and my sssd.conf file. Please have a look and let me know what you think. Thanks!
> 
> -Chris
> <logs.tar.gz>_______________________________________________
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