[Samba] Samba High CPU

Jeremy Allison jra at samba.org
Wed Jun 8 15:48:13 UTC 2016

On Wed, Jun 08, 2016 at 09:54:22AM -0300, Fernando Favero wrote:
> Hello
> I'm having a issue in samba with high cpu. We have a production environment
> with 3 DCs and all of them samba process is at 100%. Sometimes on
> fileserver, winbind goes offline and only return to online after restart
> all DCs process (and we suspect the cause is high cpu on DCs)
> On DCs, there are many clients with continuous traffic on port 445.
> Now we have a test environment with 1 DC and 6 Windows clients, and when
> one of this clients powered on, samba process goes 100%. Investigating, we
> discovered a continuous traffic from this client on port 445. On windows
> client, the process originator this traffic is "WMI Provider Host". There
> is no virus detected. I searched a lot on google, but not found any
> probably causes for this.
> Apparently, the problem isn't on DC, but on windows client.
> Someone have any ideia ??

Can you get and post a wireshark trace of the traffic
from this client ? Sounds like this client is forcing
the server into 100% CPU serving its requests.

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