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(ITS#4040) slapd dies when syncrepl'ing an entry with empty uniqueMember attributes

Full_Name: Michail Bachmann
Version: 2.3.7
OS: Linux 2.6
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

slapd dies with this error:

slapd: dn.c:946: dnMatch: Assertion `!((value)->bv_val == ((void *)0))' failed.

AFAICS this happens when syncrepl tries to read an entry which has an empty 
uniqueMember attribute.

This minimal LDIF-file triggers this bug:

dn: o=myOrganization,c=DE
objectClass: organization
o: myOrganization
structuralObjectClass: organization

dn: cn=tst,o=myOrganization,c=DE
cn: tst
uniqueMember: cn=user1,o=myOrganization,c=de
uniqueMember: cn=user3,o=myOrganization,c=de
objectClass: top
objectClass: groupOfUniqueNames
structuralObjectClass: groupOfUniqueNames

Thanks in advance

CU Micha