[Samba] Winbind using 100% CPU

[Jeremy Allison]

On Wed, Apr 10, 2013 at 06:46:48PM -0400, Dylan Klomparens wrote:
> I am trying to figure out why winbind is using 100% CPU on my file server.
> I am using Samba version 4.0.4. Everything is fine for a few minutes when I
> start winbind, however after a while it begins using 100% CPU. I haven't
> been able to narrow down what triggers this CPU usage spike, but I did
> attach the GNU debugger to find out what's going on in the process. The
> backtrace revealed this information:
> 
> #0  0x000000000041cf30 in _talloc_free at plt ()
> #1  0x0000000000452320 in winbindd_reinit_after_fork ()
> #2  0x00000000004524e6 in fork_domain_child ()
> #3  0x0000000000453585 in wb_child_request_trigger ()
> #4  0x000000381d2048e2 in tevent_common_loop_immediate () from
> /lib64/libtevent.so.0
> #5  0x00007fbed6b98e17 in run_events_poll () from /lib64/libsmbconf.so.0
> #6  0x00007fbed6b9922e in s3_event_loop_once () from /lib64/libsmbconf.so.0
> #7  0x000000381d204060 in _tevent_loop_once () from /lib64/libtevent.so.0
> #8  0x000000000042049a in main ()
> 
> Apparently it's stuck in the winbindd_reinit_after_fork (and more
> specifically the _talloc_free function). This code resides in
> $SOURCE_HOME\source3\winbindd\winbindd_dual.c.
> 
> Perhaps I have configured Samba incorrectly? Here are the parameters I am
> using that have to do with winbind:
> idmap config * : backend = nss
> idmap config * : range = 1000 - 300000
> 
> What are some reasons that winbind is using 100% CPU and how can I resolve
> this?
> 
> (Also, would this be an appropriate question to post to the Samba
> developer's list? If so, I will repost it there.)

Yes - please post to samba-technical, I'll follow up there.

Jeremy.