Syncrepl replication be_modify failed (18)

[Will Nowak <wan@ccs.neu.edu>]

Howdy,

I've been battling some issues with syncrepl for a while now, and I
can't quite figure out what has gone wrong.

I initially found
http://www.openldap.org/lists/openldap-software/200812/msg00040.html
which seemed to describe my issue, and it recommended upgrading to
openldap 2.4.13. I tried that, and am still having issues (now at
2.4.15). I built the software for ubuntu hardy on i386, available at
https://edge.launchpad.net/~compbrain/+archive/ppa/+sourcepub/566951/+listing-archive-extra

The situation involves a master with 3 slaves using syncrepl. A change
comes into the master adding a member to a nisNetgroup/groupOfNames
hybrid container:

dn: cn=friends,ou=netgroup,dc=example,dc=com
objectClass: groupOfNames
objectClass: nisNetgroup
objectClass: top
cn: friends
member: uid=bobby,ou=people,dc=example,dc=com
nisNetgroupTriple: (,bobby,shadow)

An incoming add for user james looks like

dn: cn=friends,ou=netgroup,dc=example,dc=com
changetype: modify
delete: member
-
add: member
member: uid=bobby,ou=people,dc=example,dc=com
member: uid=james,ou=people,dc=example,dc=com
-
delete: nisNetgroupTriple
-
add: nisNetgroupTriple
nisNetgroupTriple: (,bobby,shadow)
nisNetgroupTriple: (,james,shadow)

Up until this point, everything is fine -- all changes made on the
master have replicated ok to the slaves.

Now, james is not my friend anymore, so he gets removed from the container:
dn: cn=friends,ou=netgroup,dc=example,dc=com
changetype: modify
delete: member
-
add: member
member: uid=bobby,ou=people,dc=example,dc=com
-
delete: nisNetgroupTriple
-
add: nisNetgroupTriple
nisNetgroupTriple: (,bobby,shadow)

At this point, the most recent change gets applied to the master ok,
but it does not get replicated to the slaves. They have a be_modify
failed in their logs:
Apr 13 23:05:43 sl1 slapd[30277]: syncrepl_entry: rid=049 be_search (0)
Apr 13 23:05:43 sl1 slapd[30277]: syncrepl_entry: rid=049
cn=friends,ou=netgroup,dc=example,dc=com
Apr 13 23:05:43 sl1 slapd[30277]: null_callback : error code 0x12
Apr 13 23:05:43 sl1 slapd[30277]: syncrepl_entry: rid=049 be_modify (18)
Apr 13 23:05:43 sl1 slapd[30277]: syncrepl_entry: rid=049 be_modify failed


Any thoughts?
-Will