[Samba] Failed to store repsFrom - Indexed and full searches both failed!

[Elias Pereira]

hi,

After an update to our DC4, I started to notice the error "Failed to store
repsFrom - Indexed and full searches both failed!" in the logs.

root at dc4:~# tail -f /var/log/samba/log.samba
  Copyright Andrew Tridgell and the Samba Team 1992-2023
[2023/12/05 14:09:06.191978,  0]
../../lib/util/become_daemon.c:150(daemon_status)
  daemon_status: daemon 'samba' : Starting process...
[2023/12/05 14:09:06.373562,  0]
../../source4/samba/server.c:896(binary_smbd_main)
  binary_smbd_main: samba: using 'prefork' process model
[2023/12/05 16:05:04.141027,  0]
../../source4/dsdb/kcc/kcc_periodic.c:790(samba_kcc_done)
  ../../source4/dsdb/kcc/kcc_periodic.c:790: Failed samba_kcc -
NT_STATUS_IO_TIMEOUT
[2023/12/05 16:06:30.931069,  0]
../../source4/dsdb/common/util.c:3482(dsdb_savereps)
  Failed to store repsFrom - Indexed and full searches both failed!

I tried running a "samba-tool drs replicate...", but the error occurs:

ERROR(<class 'samba.drs_utils.drsException'>): DsReplicaSync failed -
drsException: DsReplicaSync failed (3221225653, '{Device Timeout} The
specified I/O operation on %hs was not completed before the time-out period
expired.')
  File "/usr/lib/python3/dist-packages/samba/netcmd/drs.py", line 567, in
run
    drs_utils.sendDsReplicaSync(server_bind, server_bind_handle,
source_dsa_guid, NC, req_options)
  File "/usr/lib/python3/dist-packages/samba/drs_utils.py", line 100, in
sendDsReplicaSync
    raise drsException("DsReplicaSync failed %s" % estr)

Pastebin with -d10 drs replicate:
https://pastebin.com/raw/LZNTqssa

Some points:
- samba_dnsupdate --verbose --all-names is ok
- samba-tool dbcheck --cross-ncs --reset-well-known-acls --fix is ok
- samba-tool drs showrepl is ok (it takes +/- 1 minute for the result)

Researching, I saw that it could be the corrupted database, and only demote
the DC in question would solve it.

Is that really the case? If so, can I demote and use the same server,
including the same hostname and IP?

Thanks!!!

-- 
Elias Pereira