slapd: null_callback : error code 0x14

["Paul B. Henson" <henson@acm.org>]

So I've been putting off posting about this, but I recently upgraded to
2.4.45, stopped using the memberof overlay, no longer have a node with
serverID 0, and overall think my ldap servers should be in good shape
:), and it's still happening, so I thought it was time...

I'm getting weird errors in my logs about group replication changes:

Sep 15 03:55:16 minerva slapd[71654]: null_callback : error code 0x14
Sep 15 03:55:16 minerva slapd[71654]: syncrepl_message_to_op: rid=003 be_modify uid=arc464,ou=group,dc=cpp,dc=edu (20)

Sep 15 03:56:32 minerva slapd[71654]: null_callback : error code 0x14
Sep 15 03:56:32 minerva slapd[71654]: syncrepl_message_to_op: rid=002 be_modify uid=ce427l01,ou=group,dc=cpp,dc=edu (20)

Sep 15 03:56:53 minerva slapd[71654]: null_callback : error code 0x14
Sep 15 03:56:53 minerva slapd[71654]: syncrepl_message_to_op: rid=003 be_modify uid=chm250l01,ou=group,dc=cpp,dc=edu (20)


They sporadically happen on my replicas, on random groups, not typically
the same groups on each one on any given day:

Sep 15 04:04:52 egeria slapd[29652]: null_callback : error code 0x14
Sep 15 04:04:52 egeria slapd[29652]: syncrepl_message_to_op: rid=001 be_modify uid=soc202,ou=group,dc=cpp,dc=edu (20)

Sep 15 04:02:38 coeus slapd[3333]: null_callback : error code 0x14
Sep 15 04:02:38 coeus slapd[3333]: syncrepl_message_to_op: rid=001 be_modify uid=mat321,ou=group,dc=cpp,dc=edu (20)

I'm updating the member and memberUid attributes:

Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205558 MOD dn="uid=soc202,ou=group,dc=cpp,dc=edu"
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205558 MOD attr=member
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205558 RESULT tag=103 err=0 text=
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205559 MOD dn="uid=soc202,ou=group,dc=cpp,dc=edu"
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205559 MOD attr=memberUid
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205559 RESULT tag=103 err=0 text=
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205560 MOD dn="uid=soc202,ou=group,dc=cpp,dc=edu"
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205560 MOD attr=member
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205560 RESULT tag=103 err=0 text=
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205561 MOD dn="uid=soc202,ou=group,dc=cpp,dc=edu"
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205561 MOD attr=memberUid
Sep 15 04:04:52 themis slapd[3035]: conn=125451 op=205561 RESULT tag=103 err=0 text=

Sep 15 03:55:15 themis slapd[3035]: conn=125451 op=174816 MOD dn="uid=arc464,ou=group,dc=cpp,dc=edu"
Sep 15 03:55:15 themis slapd[3035]: conn=125451 op=174816 MOD attr=member
Sep 15 03:55:15 themis slapd[3035]: conn=125451 op=174816 RESULT tag=103 err=0 text=
Sep 15 03:55:15 themis slapd[3035]: conn=125451 op=174817 MOD dn="uid=arc464,ou=group,dc=cpp,dc=edu"
Sep 15 03:55:15 themis slapd[3035]: conn=125451 op=174817 MOD attr=memberUid
Sep 15 03:55:15 themis slapd[3035]: conn=125451 op=174817 RESULT tag=103 err=0 text=

As far as I can tell, all the updates succeed and the objects are
exactly the same on all the replicas, so these failures just seem to be
log noise?

Any thoughts on what's going on?

Thanks...