From the mailing list
I have a Debian Buster member server which I upgraded to version 4.14.0 and since then I have been getting several log messages like this one in syslog:
Mar 13 10:33:34 lxd-m1 smbd: filename_convert_internal: open_pathref_fsp [roy] failed: NT_STATUS_ACCESS_DENIED
Have patch, need bugnumber.
This bug was referenced in samba master: