Install openldap-2.4.16 is paused when "make test"

[openbsd shen <openbsd.shen@gmail.com>]

I use these command to install openldap 2.4.16:
env CPPFLAGS="-I/usr/local/BerkeleyDB.4.7/include"
LDFLAGS="-L/usr/local/BerkeleyDB.4.7/lib" ./configure
--prefix=/usr/local/openldap --enable-ldbm --enable-crypt
make depens
make

When I "make test", it said:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
cd tests; make test
make[1]: Entering directory `/tmp/openldap-2.4.16/tests'
make[2]: Entering directory `/tmp/openldap-2.4.16/tests'
Initiating LDAP tests for BDB...
Running ./scripts/all...
>>>>> Executing all LDAP tests for bdb
>>>>> Starting test000-rootdse ...
running defines.sh
Starting slapd on TCP/IP port 9011...
Using ldapsearch to retrieve the root DSE...
Using ldapsearch to retrieve the cn=Subschema...
Using ldapsearch to retrieve the cn=Monitor...
dn:
objectClass: top
objectClass: OpenLDAProotDSE
structuralObjectClass: OpenLDAProotDSE
configContext: cn=config
namingContexts: o=OpenLDAP Project,l=Internet
monitorContext: cn=Monitor
supportedControl: 1.3.6.1.4.1.4203.1.9.1.1
supportedControl: 2.16.840.1.113730.3.4.18
supportedControl: 2.16.840.1.113730.3.4.2
supportedControl: 1.3.6.1.4.1.4203.1.10.1
supportedControl: 1.2.840.113556.1.4.319
supportedControl: 1.2.826.0.1.3344810.2.3
supportedControl: 1.3.6.1.1.13.2
supportedControl: 1.3.6.1.1.13.1
supportedControl: 1.3.6.1.1.12
supportedExtension: 1.3.6.1.4.1.4203.1.11.1
supportedExtension: 1.3.6.1.4.1.4203.1.11.3
supportedExtension: 1.3.6.1.1.8
supportedFeatures: 1.3.6.1.1.14
supportedFeatures: 1.3.6.1.4.1.4203.1.5.1
supportedFeatures: 1.3.6.1.4.1.4203.1.5.2
supportedFeatures: 1.3.6.1.4.1.4203.1.5.3
supportedFeatures: 1.3.6.1.4.1.4203.1.5.4
supportedFeatures: 1.3.6.1.4.1.4203.1.5.5
supportedLDAPVersion: 3
vendorName: The OpenLDAP Project <http://www.openldap.org/>
entryDN:
subschemaSubentry: cn=Subschema

dn: cn=Subschema
objectClass: top
objectClass: subentry
objectClass: subschema
objectClass: extensibleObject
cn: Subschema

dn: cn=Monitor
objectClass: monitorServer
cn: Monitor
description: This subtree contains monitoring/managing objects.
description: This object contains information about this server.
description: Most of the information is held in operational attributes, which
 must be explicitly requested.
monitoredInfo: OpenLDAP: slapd 2.4.16 (Sep 24 2009 10:16:54)

>>>>> Test succeeded
>>>>> ./scripts/test000-rootdse completed OK.

>>>>> Starting test001-slapadd ...
running defines.sh
Running slapadd to build slapd database...
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

And then, the progress is pausing....

I found that the port 9101 is opening:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
tcp        0      0 127.0.0.1:9011              0.0.0.0:*
     LISTEN
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

And the progress is running:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
root     24159  0.0  0.4  10964  4148 pts/0    S+   10:19   0:00
/tmp/openldap-2.4.16/tests/../servers/slapd/slapd -Ta -d 0 -f
/tmp/openldap-2.4.16/tests/testrun/slapadd.conf -l
./testdata/test-ordered.ldif
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>