Failed to prepare commit of transaction: DRS linked attribute for GUID

[Andrej Gessel]

Hello Tim,

I looked a bit deeper into this and you patch do not help here.
We have following call tree:

ldb_transaction_prepare -> replmd_prepare_commit -> 
replmd_process_linked_attribute -> replmd_extract_la_entry_details

last function returns LDB_ERR_NO_SUCH_OBJECT, this error will be 
returned to caller (ldb_transaction_prepare), so the status
WERR_DS_DRA_MISSING_PARENT will not be set and request will not be 
repeated with GET_ANC.

The problem still exists in Samba 4.8.0rc2.

samba-tool drs replicate with --local and with --full-sync ends up with 
the same error.


Andrej


Am 05.09.2017 um 00:11 schrieb Tim Beale via samba-technical:
> Hi,
>
> We've seen this problem before when inter-operating with Microsoft. See:
> https://lists.samba.org/archive/samba/2017-June/209020.html
>
> The patch that should fix this has been delivered to master. However,
> unless we backport the related patches, it won't be in a Samba release
> until 4.8.
> https://git.samba.org/?p=samba.git;a=commit;h=f87332eb35638cc38f83c580d4623ab978088601
>
> In the meantime you could try running 'samba-tool drs replicate
> --local'. This should set the GET_ANC flag in the request, which should
> hopefully avoid this problem.
>
> However, note that when inter-operating between Windows and Samba you
> could still potentially get cases where replication succeeds, but linked
> attributes are dropped (because Samba doesn't know how about the target
> object yet). This should be fixed now in the latest master branch.
>
> Cheers,
> Tim
>
> On 04/09/17 23:45, denis.shigapov via samba-technical wrote:
>> There is a domain controller on windows 2008R2, DC samba Version 4.6.5
>> is connected to it. After renaming the user to make mistakes:
>>
>> [2017/09/04 10:04:54.528818,  2]
>> ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:6271(replmd_process_
>> linked_attribute)
>>    ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:6271: WARNING:
>> Failed to re-resolve GUID f5d7a9b2-981c-49c9-a262-f3ca4c90272a - using
>> CN=Пользовтаель Пользоватеть,OU=Users Shop M,DC=euro,DC=ru
>> [2017/09/04 10:04:54.547960,  2]
>> ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:6271(replmd_process_
>> linked_attribute)
>>    ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:6271: WARNING:
>> Failed to re-resolve GUID bf04e179-4c7c-4cf9-b7a3-d37b287b1f3e - using
>> CN=Пользоватеть2 Пользователь2,OU=продажи,OU=магазин,OU=Users
>> Office,DC=euro,DC=ru
>> [2017/09/04 10:04:54.615598,  2]
>> ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:6271(replmd_process_
>> linked_attribute)
>>    ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:6271: WARNING:
>> Failed to re-resolve GUID bf04e179-4c7c-4cf9-b7a3-d37b287b1f3e - using
>> CN=Пользоватеть2 Пользователь2,OU=продажи,OU=магазин,OU=Users
>> Office,DC=euro,DC=ru
>> [2017/09/04 10:04:54.622398,  0]
>> ../source4/dsdb/repl/replicated_objects.c:933(dsdb_replicated_objects_c
>> ommit)
>>    ../source4/dsdb/repl/replicated_objects.c:933 Failed to prepare
>> commit of transaction: DRS linked attribute for GUID bf04e179-4c7c-
>> 4cf9-b7a3-d37b287b1f3e - DN not found
>> [2017/09/04 10:04:54.629436,  0]
>> ../source4/dsdb/repl/drepl_out_helpers.c:942(dreplsrv_op_pull_source_ap
>> ply_changes_trigger)
>>    Failed to commit objects:
>> WERR_GEN_FAILURE/NT_STATUS_INVALID_NETWORK_RESPONSE
>>
>>
>>
>> I tried to start synchronization and got:
>>
>> samba-tool drs replicate srv-m-dc.euro.ru srv-o.euro.ru OU=Users\ Shop\
>> M,DC=euro,DC=ru
>> ERROR(<class 'samba.drs_utils.drsException'>):
>> DsReplicaSync failed - drsException: DsReplicaSync failed (8440,
>> 'WERR_DS_DRA_BAD_NC')
>>    File "/usr/lib64/python2.7/site-
>> packages/samba/netcmd/drs.py", line 368, in run
>>     
>> drs_utils.sendDsReplicaSync(server_bind, server_bind_handle,
>> source_dsa_guid, NC, req_options)
>>    File "/usr/lib64/python2.7/site-
>> packages/samba/drs_utils.py", line 83, in sendDsReplicaSync
>>      raise
>> drsException("DsReplicaSync failed %s" % estr)
>>