Winbind using 100% CPU
jmcd at samba.org
Tue Apr 16 08:00:57 MDT 2013
On Thu, Apr 11, 2013 at 6:59 PM, Jeremy Allison <jra at samba.org> wrote:
> On Thu, Apr 11, 2013 at 09:58:33AM -0400, Dylan Klomparens wrote:
>> (Re-posting on this email list per Jeremy Allison's request.)
>> 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
>> #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
> That looks like corrupted memory - probably a loop
> in the talloc tree.
I've got a user who sees this and we're adding the same dlinklist
element twice, creating a loop in the winbind child list.
I've got a broken wrist so responses take a while, but that's my
current hint. On 3.6.3 and 3.6.13.
> Can you run under valgrind and try and reproduce ?
jmcd at samba dot org
jmcd at themcdonoughs dot org
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