[Samba] Some strange errors in logs

[Mariusz80]

Hello there. 
I need consultation and any advice about my log file.

I have some strange errors in my log file about "invalid zone operation" and
"pad length mismatch. Calculated 44  got 0" on my DC1 and DC2
samba Version 4.5.12-Debian
smb.conf:
[global]
        workgroup = !!!
        realm = !!!
        netbios name = !!!
        server role = active directory domain controller
        server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl,
winbindd, ntp_signd, kcc, dnsupdate
        idmap_ldb:use rfc2307 = yes

load printers = no
printing = bsd
printcap name = /dev/null
disable spoolss = yes

log level = 1
max log size = 1000
log file = /var/log/samba/%m.log

lm announce = no
client lanman auth = no

ntlm auth = yes
lanman auth = no
client ntlmv2 auth = yes

[netlogon]
        path = /var/lib/samba/sysvol/dfm.biz.pl/scripts
        read only = No

[sysvol]
        path = /var/lib/samba/sysvol
        read only = No

Sample log:
[2017/11/09 11:22:46.190213,  0]
../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1085(dnsserver_query_zone)
  dnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone
operation IsSigneddnsserver: Invalid zone operation IsSigneddnsserver:
Invalid zone operation IsSigneddnsserver: Invalid zone operation
IsSigneddnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone
operation IsSigneddnsserver: Invalid zone operation IsSigneddnsserver:
Invalid zone operation IsSigneddnsserver: Invalid zone operation
IsSigned../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch.
Calculated 44  got 0
[2017/11/09 12:11:58.968226,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/09 12:28:13.768393,  0]
../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1085(dnsserver_query_zone)
  dnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone
operation IsSigned../librpc/rpc/dcerpc_util.c:227: ERROR: pad length
mismatch. Calculated 44  got 0
[2017/11/09 14:54:39.320660,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/09 15:02:11.878768,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/09 15:04:38.500247,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/09 15:28:39.928914,  0]
../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1085(dnsserver_query_zone)
  dnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone
operation IsSigneddnsserver: Invalid zone operation IsSigneddnsserver:
Invalid zone operation IsSigned../librpc/rpc/dcerpc_util.c:227: ERROR: pad
length mismatch. Calculated 44  got 0
[2017/11/09 16:05:31.014135,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/09 21:53:03.428512,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 06:58:00.225241,  1]
../source4/dsdb/kcc/garbage_collect_tombstones.c:68(garbage_collect_tombstones_part)
  Doing a full scan on DC=ForestDnsZones,DC=dfm,DC=biz,DC=pl and looking for
deleted objects
[2017/11/10 06:58:00.228111,  1]
../source4/dsdb/kcc/garbage_collect_tombstones.c:68(garbage_collect_tombstones_part)
  Doing a full scan on DC=DomainDnsZones,DC=dfm,DC=biz,DC=pl and looking for
deleted objects
[2017/11/10 06:58:00.236321,  1]
../source4/dsdb/kcc/garbage_collect_tombstones.c:68(garbage_collect_tombstones_part)
  Doing a full scan on CN=Configuration,DC=dfm,DC=biz,DC=pl and looking for
deleted objects
[2017/11/10 06:58:00.287988,  1]
../source4/dsdb/kcc/garbage_collect_tombstones.c:68(garbage_collect_tombstones_part)
  Doing a full scan on DC=dfm,DC=biz,DC=pl and looking for deleted objects
[2017/11/10 07:59:55.958736,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 08:07:18.247157,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 08:18:51.026675,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 08:18:51.026990,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 09:26:40.073870,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 09:26:40.074160,  1]
../librpc/rpc/dcerpc_util.c:227(dcerpc_pull_auth_trailer)
  ../librpc/rpc/dcerpc_util.c:227: ERROR: pad length mismatch. Calculated 44 
got 0
[2017/11/10 09:46:51.945841,  0]
../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1085(dnsserver_query_zone)

I have also strange thing with SOA record. It is changing onself to DC2 and
later during the day or next day back to DC1. Is it normal behaviour ?
What do you think about that ?
---
Mariusz
Thanks



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