Some errors with openldap1.2.11 for solaris 2.6

[<wanglong@wh129.com>]

We have a product envionment for LDAP Services,  one  as Master  ,two
as slave. Now we have 150,000 Users ntrys.But we have a big problem :
    when we change or add some entrys int the master server ,some
times we get errors from the slurpd replication process.and the
detail debug info as :
Aug 31 15:17:55 ldap1 slapd[14404]: conn=391253 op=130 ADD
dn="CN=GOGO301,OU=PEOPLE,DC=SH163,DC=NET"
Aug 31 15:17:55 ldap1 slapd[14404]: ====> entry cn=gogo301,ou=People,
dc=sh163, dc=net id 8500 already in id cache
Aug 31 15:17:55 ldap1 slapd[14404]: cache_add_entry_lock failed
Aug 31 15:17:55 ldap1 slapd[14404]: conn=391253 op=130 RESULT err=68
tag=105 nentries=0
Aug 31 15:37:58 ldap1 slapd[14404]: conn=391253 op=139 ADD
dn="CN=SANDI,OU=PEOPLE,DC=SH163,DC=NET"
Aug 31 15:37:58 ldap1 slapd[14404]: ====> entry cn=sandi,ou=People,
dc=sh163, dc=net id 8501 already in id cache
Aug 31 15:37:58 ldap1 slapd[14404]: cache_add_entry_lock failed
 
 
 

Aug 31 15:37:58 ldap1 slapd[14404]: conn=391253 op=139 RESULT err=68
tag=105 nentries=0
Aug 31 15:47:58 ldap1 slapd[14404]: conn=391253 op=142 ADD
dn="CN=LANTEC,OU=PEOPLE,DC=SH163,DC=NET"
Aug 31 15:47:58 ldap1 slapd[14404]: ====> entry cn=lantec,ou=People,
dc=sh163, dc=net id 8503 already in id cache
Aug 31 15:47:58 ldap1 slapd[14404]: cache_add_entry_lock failed
 
 
 
please help me how to solve it problem.
The COnfigure command use :
    
    #Configure for new solaris 2.6/7
    env \
    CPPFLAGS="-I/usr/local/include" LDFLAGS="-L/usr/local/lib" \
    ac_cv_func_pthread_create=no ol_cv_kthread_flag=no \
    ol_cv_pthread_flag=no ol_cv_pthreads_flag=no \
    ol_cv_thread_flag=no ./configure --prefix=/opt/openldap
 
And we configure openldap with --without-threads option ,the error is
the some.
 
 
 
                                                               
wanglong