smbd exited on signal 6

[junior466]

Today one of my hosts that use a SMB share to backup some files failed to run and upon checking the logs in freenas, I found this:

pid 19878 (smbd), uid 0: exited on signal 6 (core dumped)
pid 98451 (smbd), uid 0: exited on signal 6 (core dumped)
pid 98473 (smbd), uid 0: exited on signal 6 (core dumped)
pid 98474 (smbd), uid 0: exited on signal 6 (core dumped)
pid 98482 (smbd), uid 0: exited on signal 6 (core dumped)
...goes on..

The messages didn't stop until I restarted the smbd service. Unfortunately it's not the first time it has happened.

Running FreeNAS-11.2-U8.

edit.

Here's the content of /var/log/samba4/log.smbd

Code:

[2021/03/25 19:23:18.479915,  0] ../source3/smbd/server.c:1754(main)
  smbd version 4.9.18 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2018
[2021/03/25 19:23:18.482253,  1] ../source3/profile/profile_dummy.c:30(set_profile_level)
  INFO: Profiling support unavailable in this build.
[2021/03/25 19:23:18.729678,  1] ../source3/smbd/files.c:227(file_init_global)
  file_init_global: Information only: requested 1412579 open files, 59392 are available.
[2021/03/25 19:23:18.733297,  0] ../lib/util/become_daemon.c:136(daemon_ready)
  daemon_ready: daemon 'smbd' finished starting up and ready to serve connections
[2021/03/25 19:23:20.060014,  0] ../source3/lib/util_sock.c:875(matchname)
  matchname: host name/name mismatch: 192.168.139.25 != (NULL)
[2021/03/25 19:23:20.060131,  0] ../source3/lib/util_sock.c:1054(get_remote_hostname)
  matchname failed on 192.168.139.25
[2021/03/25 19:47:25.144005,  0] ../source3/lib/util_sock.c:875(matchname)
  matchname: host name/name mismatch: 192.168.139.25 != (NULL)
[2021/03/25 19:47:25.144140,  0] ../source3/lib/util_sock.c:1054(get_remote_hostname)
  matchname failed on 192.168.139.25

edit 2 - It seems that disabling hostname lookups under smbd configuration can help?