[Samba] tombstone record has 1 neighbour records

[Bartłomiej Kamiński]

sending once again without pgp signing because message was trimmed

Hi,

after update Samba on DCs to 4.20 logs are fulfilled with messages like 
this:

> [2024/04/08 10:02:19.491146,  0] 
> source4/dns_server/dnsserver_common.c:1038(dns_common_replace)
> dns_common_replace: tombstone record has 1 neighbour records.

I have reached log level to 3 in smb.conf and I see that this log is 
preceded by dns record update request:

> [2024/04/08 10:27:09.942141,  2] 
> source4/dns_server/dns_update.c:834(dns_server_process_update)
> Got a dns update request.
> [2024/04/08 10:27:09.942273,  2] 
> source4/dns_server/dns_update.c:791(dns_update_allowed)
> Update not allowed for unsigned packet.
> [2024/04/08 10:27:09.955219,  3] 
> lib/ldb-samba/ldb_wrap.c:332(ldb_wrap_connect)
> ldb_wrap open of privilege.ldb
> [2024/04/08 10:27:09.959169,  3] 
> source4/samba/service_stream.c:67(stream_terminate_connection)
> stream_terminate_connection: Terminating connection - 
> 'dns_tcp_call_loop: tstream_read_pdu_blob_recv() - 
> NT_STATUS_CONNECTION_RESET'
> [2024/04/08 10:27:09.960597,  2] 
> source4/dns_server/dns_update.c:834(dns_server_process_update)
> Got a dns update request.
> [2024/04/08 10:27:09.961275,  3] 
> source4/dns_server/dns_update.c:397(handle_one_update)
> handle_one_update: Looking at record:
> [2024/04/08 10:27:09.961295,  1] 
> source4/dns_server/dns_update.c:399(handle_one_update)
> discard_const(update): struct dns_res_rec
> name                     : MASKED
> rr_type                  : DNS_QTYPE_AAAA (0x1C)
> rr_class                 : DNS_QCLASS_ANY (0xFF)
> ttl                      : 0x00000000 (0)
> length                   : 0x0000 (0)
> rdata                    : union dns_rdata(case 0x1C)
> ipv6_record              : (null)
> unexpected               : DATA_BLOB length=0
> [2024/04/08 10:27:09.961947,  3] 
> source4/dns_server/dns_update.c:397(handle_one_update)
> handle_one_update: Looking at record:
> [2024/04/08 10:27:09.961967,  1] 
> source4/dns_server/dns_update.c:399(handle_one_update)
> discard_const(update): struct dns_res_rec
> name                     : MASKED
> rr_type                  : DNS_QTYPE_A (0x1)
> rr_class                 : DNS_QCLASS_ANY (0xFF)
> ttl                      : 0x00000000 (0)
> length                   : 0x0000 (0)
> rdata                    : union dns_rdata(case 0x1)
> ipv4_record              : (null)
> unexpected               : DATA_BLOB length=0
> [2024/04/08 10:27:09.962646,  3] 
> source4/dns_server/dns_update.c:397(handle_one_update)
> handle_one_update: Looking at record:
> [2024/04/08 10:27:09.962666,  1] 
> source4/dns_server/dns_update.c:399(handle_one_update)
> discard_const(update): struct dns_res_rec
> name                     : MASKED
> rr_type                  : DNS_QTYPE_A (0x1)
> rr_class                 : DNS_QCLASS_IN (0x1)
> ttl                      : 0x000004b0 (1200)
> length                   : 0x0004 (4)
> rdata                    : union dns_rdata(case 0x1)
> ipv4_record              : MASKED
> unexpected               : DATA_BLOB length=0
> [2024/04/08 10:27:09.962838,  0] 
> source4/dns_server/dnsserver_common.c:1038(dns_common_replace)
> dns_common_replace: tombstone record has 1 neighbour records.
> [2024/04/08 10:27:09.963767,  3] 
> source4/dsdb/samdb/ldb_modules/descriptor.c:1885(descriptor_prepare_commit)
> descriptor_prepare_commit: changes: num_registrations=0
> [2024/04/08 10:27:09.963783,  3] 
> source4/dsdb/samdb/ldb_modules/descriptor.c:1887(descriptor_prepare_commit)
> descriptor_prepare_commit: changes: num_registered=0
> [2024/04/08 10:27:09.963790,  3] 
> source4/dsdb/samdb/ldb_modules/descriptor.c:1997(descriptor_prepare_commit)
> descriptor_prepare_commit: changes: num_toplevel=0
> [2024/04/08 10:27:09.963796,  3] 
> source4/dsdb/samdb/ldb_modules/descriptor.c:2018(descriptor_prepare_commit)
> descriptor_prepare_commit: changes: num_processed=0
> [2024/04/08 10:27:09.963801,  3] 
> source4/dsdb/samdb/ldb_modules/descriptor.c:2019(descriptor_prepare_commit)
> descriptor_prepare_commit: objects: num_processed=0
> [2024/04/08 10:27:09.963807,  3] 
> source4/dsdb/samdb/ldb_modules/descriptor.c:2020(descriptor_prepare_commit)
> descriptor_prepare_commit: objects: num_skipped=0

The record seems to be updated properly.

Can someone give some advice how to check what causes this and how to 
resolve it?

Regards,

Bartek