(ITS#8991) Error while trying to create database with attribute olcSuffix in internationalized UTF-8 DN format.

[uneex@ya.ru]

Full_Name: Varnava Sergey
Version: openldap-sasl-server-2.4.47
OS: FreeBSD 12.0-RELEASE
URL: 
Submission from: (NULL) (86.62.75.82)


slapd configured to use cn=config

I'm trying to create database under cn=config with olcSuffix attribute set to DN
with international UTF-8 characters.

`cat adddb.ldif`
dn: olcDatabase=mdb
objectClass: olcDatabaseConfig
objectClass: olcMdbConfig
olcDatabase: mdb
olcSuffix:: ZGM90KHQvtC70L3Ri9GI0LrQvixkYz3QlNGD0YDQlNC+0LwK
olcRootDN:: Y2490JTQuNGA0LXQutGC0L7RgCxkYz3QodC+0LvQvdGL0YjQutC+LGRjPdCU0YPRgNCU0L7QvAo=
olcRootPW:: e1NTSEF9ZHVyc2VjcmV0Cg==
olcDbIndex: objectClass eq
olcDbDirectory:  /var/db/openldap-data

When doing `ldapadd -x -w secret -f /root/adddb.ldif`
I'm getting this error:

adding new entry "olcDatabase=mdb"
ldap_add: Invalid syntax (21)
        additional info: olcSuffix: value #0 invalid per syntax

Some debug from log file:

...
Mar 13 20:32:00 ldap slapd[2181]: send_ldap_result: conn=1004 op=0 p=3
Mar 13 20:32:00 ldap slapd[2181]: send_ldap_response: msgid=1 tag=97 err=0
Mar 13 20:32:00 ldap slapd[2181]: daemon: activity on 1 descriptor
Mar 13 20:32:00 ldap slapd[2181]: daemon: activity on:
Mar 13 20:32:00 ldap slapd[2181]:  13r
Mar 13 20:32:00 ldap slapd[2181]: 
Mar 13 20:32:00 ldap slapd[2181]: daemon: read activity on 13
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=6 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=7 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=8 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: connection_get(13): got connid=1004
Mar 13 20:32:00 ldap slapd[2181]: connection_read(13): checking for input on
id=1004
Mar 13 20:32:00 ldap slapd[2181]: op tag 0x68, time 1552498320
Mar 13 20:32:00 ldap slapd[2181]: conn=1004 op=1 do_add
Mar 13 20:32:00 ldap slapd[2181]: daemon: activity on 1 descriptor
Mar 13 20:32:00 ldap slapd[2181]: daemon: waked
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=6 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=7 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=8 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: >>> dnPrettyNormal: <olcDatabase=mdb>
Mar 13 20:32:00 ldap slapd[2181]: <<< dnPrettyNormal: <olcDatabase=mdb>,
<olcDatabase=mdb>
Mar 13 20:32:00 ldap slapd[2181]: >>> dnPretty:
<dc=&#1057;&#1086;&#1083;&#1085;<D1>M-^K<D1>M-^H&#1082;&#1086;,dc=<D0>M-^T<D1>M-^C<D1>M-^@<D0>M-^T&#1086;&#1084;
>
Mar 13 20:32:00 ldap slapd[2181]: send_ldap_result: conn=1004 op=1 p=3
Mar 13 20:32:00 ldap slapd[2181]: send_ldap_response: msgid=2 tag=105 err=21
Mar 13 20:32:00 ldap slapd[2181]: daemon: activity on 1 descriptor
Mar 13 20:32:00 ldap slapd[2181]: daemon: activity on:
Mar 13 20:32:00 ldap slapd[2181]:  13r
Mar 13 20:32:00 ldap slapd[2181]: 
Mar 13 20:32:00 ldap slapd[2181]: daemon: read activity on 13
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=6 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=7 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=8 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: connection_get(13): got connid=1004
Mar 13 20:32:00 ldap slapd[2181]: connection_read(13): checking for input on
id=1004
Mar 13 20:32:00 ldap slapd[2181]: op tag 0x42, time 1552498320
Mar 13 20:32:00 ldap slapd[2181]: ber_get_next on fd 13 failed errno=0 (No
error: 0)
Mar 13 20:32:00 ldap slapd[2181]: connection_read(13): input error=-2 id=1004,
closing.
Mar 13 20:32:00 ldap slapd[2181]: connection_closing: readying conn=1004 sd=13
for close
Mar 13 20:32:00 ldap slapd[2181]: connection_close: deferring conn=1004 sd=13
Mar 13 20:32:00 ldap slapd[2181]: conn=1004 op=2 do_unbind
Mar 13 20:32:00 ldap slapd[2181]: connection_resched: attempting closing
conn=1004 sd=13
Mar 13 20:32:00 ldap slapd[2181]: connection_close: conn=1004 sd=13
Mar 13 20:32:00 ldap slapd[2181]: daemon: removing 13
Mar 13 20:32:00 ldap slapd[2181]: daemon: activity on 1 descriptor
Mar 13 20:32:00 ldap slapd[2181]: daemon: waked
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=6 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=7 active_threads=0
tvp=NULL
Mar 13 20:32:00 ldap slapd[2181]: daemon: select: listen=8 active_threads=0
tvp=NULL
...

Is it possible to solve this problem?