Out Of Memory problems

It seems that OOM kills webmin I cannot figure out what’s root cause. Where should I start to look for clues?
there is no /var/webmin/error.log

Kernel log is very long it contains several lines out of memory and kill process xxx but I cannot find any keyword re. webmin.

outcome of tail -30 /var/log/httpd/error_log

[Sun Aug 15 03:49:07.028851 2021] [lbmethod_heartbeat:notice] [pid 633] AH02282: No slotmem from mod_heartmonitor
[Sun Aug 15 03:49:07.062504 2021] [mpm_prefork:notice] [pid 633] AH00163: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_fcgid/2.3.9 PHP/5.4.16 SVN/1.7.14 configured -- resuming normal operations
[Sun Aug 15 03:49:07.062523 2021] [core:notice] [pid 633] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
OS type and version: CentOS Linux 7.9.2009
Webmin version: 1.973
Virtualmin version: 6.16
Related products version: QEMU Virtual CPU version (cpu64-rhel6), 2 cores

The first thing which I would disable is clam antivirus.


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