389 directory server hangs - kolab 16 - Ubuntu 18.04 LTS

[specktator]

Hello,

I'm experiencing this issue from 389 directory server, where it just 
hangs and right before that the error log has multiple times the message 
shown below. Sometimes there are no processes left running and some the 
process is just hanged doing nothing. So, I kill the process, restart 
dirsrv service and everything works. How can I fix this?

I came across one old thread from this mailing list but i think it still 
remains unsolved.

"ERR - NSACLPlugin - acl_access_allowed - Resetting aclpb_pblock 
0x7f889c000b20 to pblock addr 0x7f889c04bc90p"


Os version: Ubuntu 18.04.6 LTS (kvm virtual machine 8GB RAM)

Kolab package version: kolab/unknown,now 16.0.1-22

uname -a  output:

Linux 4.15.0-161-generic #169-Ubuntu SMP Fri Oct 15 13:41:54 UTC 2021 
x86_64 x86_64 x86_64 GNU/Linux

apt packages installed

389-ds-base/bionic,now 1.3.7.10-1ubuntu1 amd64 [installed,automatic]
389-ds-base-libs/bionic,now 1.3.7.10-1ubuntu1 amd64 [installed,automatic]
389-ds-console/bionic,now 1.2.16-1 all [installed,automatic]
389-ds-console-doc/bionic,now 1.2.16-1 all [installed,automatic]


Thank you all,

specktator