I installed the package available in bionic-proposed as you can see
below:

root@openldap-bionic-sru:~# apt policy slapd
slapd:
  Installed: 2.4.45+dfsg-1ubuntu1.4
  Candidate: 2.4.45+dfsg-1ubuntu1.4
  Version table:
 *** 2.4.45+dfsg-1ubuntu1.4 500
        500 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     2.4.45+dfsg-1ubuntu1.3 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
     2.4.45+dfsg-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

And after executing the steps presented in the Test case section, the
slapd process did not die:

root@openldap-bionic-sru:~# ps aux | grep slapd
openldap  1029  0.0  4.5 2106104 730124 ?      Ssl  18:51   0:00 
/usr/sbin/slapd -h ldap:/// ldapi:/// -g openldap -u openldap -F 
/etc/ldap/slapd.d
root      1488  0.0  0.0  14852   840 ?        S+   18:52   0:00 grep 
--color=auto slapd
root@openldap-bionic-sru:~# ldapsearch -x -h localhost -b dc=example,dc=com 
-LLL uid=root
Server is unwilling to perform (53)
Additional information: searchFilter/searchFilterAttrDN massage error
root@openldap-bionic-sru:~# ps aux | grep slapd
openldap  1029  0.0  4.5 2106104 730124 ?      Ssl  18:51   0:00 
/usr/sbin/slapd -h ldap:/// ldapi:/// -g openldap -u openldap -F 
/etc/ldap/slapd.d
root      1492  0.0  0.0  14852   804 ?        S+   18:52   0:00 grep 
--color=auto slapd

The PID of the slapd process is the same. Moreover, there is no sign of
crash in the syslog output nor a crash file in /var/crash:

root@openldap-bionic-sru:~# cat /var/log/syslog | grep filter_free
root@openldap-bionic-sru:~# ls /var/crash/ | grep slapd

** Tags removed: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1838370

Title:
  slapd segfault on filter parse error

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