Description of problem:
This a bug report to investigate a LDAP memory leak in RHEL-8.5.0 , IPA context, possibly in slapi-nis.

debuginfo and libasan had been installed, dirsrv systemd service drop-in config file created, and we need the /run/dirsrv/ns-slapd*asan* files to be reviewed.


Version-Release number of selected component (if applicable):

VMWare guest
16GB RAM
RHEL-8.5 IdM, 4 replicas topology 

small DB, under 10MB

redhat-release-8.5-0.8.el8.x86_64
389-ds-base-1.4.3.23-10.module+el8.5.0+12398+47000435.x86_64
ipa-server-4.9.6-6.module+el8.5.0+12660+88e16a2c.x86_64
slapi-nis-0.56.6-4.module+el8.5.0+12583+bf7ffcf6.x86_64


How reproducible:
"rapidely" iafter a LDAP restart, in customer's environment, unclear how fast or how often.


Steps to Reproduce:
1. N/A
2.
3.


Actual results:

[3183493.688447] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-dirsrv.slice/dirsrv,task=ns-slapd,pid=1823,uid=389
[3183493.691422] Out of memory: Killed process 1823 (ns-slapd) total-vm:39127536kB, anon-rss:11999352kB, file-rss:0kB, shmem-rss:8kB, UID:389 pgtables:68564kB oom_score_adj:0
[3183496.595555] oom_reaper: reaped process 1823 (ns-slapd), now anon-rss:0kB, file-rss:164kB, shmem-rss:8kB


Expected results:
yes


Additional info:

The situation was initially happening on RHEL-8.4 with

389-ds-base-1.4.3.16-13.module+el8.4.0+10307+74bbfb4e.x86_64 Sun May 23 15:54:36 2021
certmonger-0.79.13-2.el8.x86_64                             Sun May 23 15:54:35 2021
custodia-0.6.0-3.module+el8.1.0+4098+f286395e.noarch        Fri Nov 13 14:29:41 2020
ipa-client-4.9.2-3.module+el8.4.0+10412+5ecb5b37.x86_64     Sun May 23 15:54:41 2021
ipa-client-common-4.9.2-3.module+el8.4.0+10412+5ecb5b37.noarch Sun May 23 15:52:40 2021
ipa-server-4.9.2-3.module+el8.4.0+10412+5ecb5b37.x86_64     Sun May 23 15:54:57 2021
nspr-4.25.0-2.el8_2.x86_64                                  Fri Nov 13 14:21:26 2020
nss-3.53.1-17.el8_3.x86_64                                  Sun May 23 15:52:50 2021
nss-softokn-3.53.1-17.el8_3.x86_64                          Sun May 23 15:52:50 2021
nss-softokn-freebl-3.53.1-17.el8_3.x86_64                   Sun May 23 15:52:50 2021
nss-sysinit-3.53.1-17.el8_3.x86_64                          Sun May 23 15:52:50 2021
nss-tools-3.53.1-17.el8_3.x86_64                            Sun May 23 15:52:56 2021
nss-util-3.53.1-17.el8_3.x86_64                             Sun May 23 15:52:38 2021
pki-ca-10.10.5-2.module+el8.4.0+10466+9830f79e.noarch       Sun May 23 15:54:57 2021
redhat-release-8.4-0.6.el8.x86_64                           Sun May 23 15:55:17 2021
redhat-release-eula-8.4-0.6.el8.x86_64                      Sun May 23 15:54:54 2021
slapi-nis-0.56.6-2.module+el8.4.0+10615+2234cc2c.x86_64     Sun May 23 15:54:37 2021
sssd-client-2.4.0-9.el8.x86_64                              Sun May 23 15:52:48 2021