After samba-tool ntacl sysvolreset
samba-tool ntacl sysvolcheck yields:
ERROR(<class 'samba.provision.ProvisioningError'>): uncaught exception - ProvisioningError: DB ACL on GPO directory /usr/local/samba/var/locks/sysvol/kzsdabas.hu/Policies/{6AC1786C-016F-11D2-945F-00C04FB984F9} O:LAG:DUD:P(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;EA)(A;OICIIO;0x001f01ff;;;CO)(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;SY)(A;OICI;0x001200a9;;;AU)(A;OICI;0x001200a9;;;ED) does not match expected value O:DAG:DUD:P(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;EA)(A;OICIIO;0x001f01ff;;;CO)(A;OICI;0x001f01ff;;;DA)(A;OICI;0x001f01ff;;;SY)(A;OICI;0x001200a9;;;AU)(A;OICI;0x001200a9;;;ED) from GPO object
  File "/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/__init__.py", line 175, in _run
    return self.run(*args, **kwargs)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/ntacl.py", line 245, in run
    lp)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/provision/__init__.py", line 1599, in checksysvolacl
    direct_db_access)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/provision/__init__.py", line 1550, in check_gpos_acl
    domainsid, direct_db_access)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/provision/__init__.py", line 1500, in check_dir_acl
    raise ProvisioningError('%s ACL on GPO directory %s %s does not match expected value %s from GPO object' % (acl_type(direct_db_access), path, fsacl_sddl, acl)) 
which according to Andrew Bartlett (http://lists.samba.org/archive/samba-technical/2012-December/089643.html) is caused by the inability to map Domain Admins to an uid in a domain create by classicupgrade.