[Samba] Troubleshooting high CPU load

Mark Nienberg mnlists at tippingstructural.com
Thu Jan 25 18:43:28 UTC 2018

I'm investigating high CPU load on a domain member server (file server)
after an upgrade from 4.5.5 to 4.6.2. The problem continued after a
subsequent upgrade to 4.6.7.

I turned up the log level to 3 for a short time and looked at the logs. One
thing I notice is some entries like this:

[2018/01/24 18:28:37.933498,  3]
  get_user_from_kerberos_info: Username STA\I7X4-42G-12$ is invalid on this
[2018/01/24 18:28:37.933525,  3]
  auth3_generate_session_info_pac: Failed to map kerberos principal to
[2018/01/24 18:28:37.933582,  3]
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_ACCESS_DENIED] || at ../source3/smbd/smb2_sesssetup.c:134
[2018/01/24 18:28:37.934058,  2]
  STA\jimenez closed file 2017dwgs/17020/Revit/633 Folsom
Street_TSE_Struct_backup/_contents.2154.dat (numopen=504) NT_STATUS_OK
[2018/01/24 18:28:37.934320,  3]
[2018/01/24 18:28:37.934340,  3] ../source3/smbd/dir.c:656(dptr_create)

The name  STA\I7X4-42G-12$ is a machine name. Is this one of those normal
and expected error messages or does it indicate a problem?

When I run "wbinfo -i" it returns valid info for domain users. Is it
supposed to do the same for machine accounts?

If this is a red herring, do you have any suggestions on how to proceed?

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