ClamAV consumes so much memory that my Postfix service gets killed by OOM Killer from time to time

Subject: ClamAV consumes so much memory that my Postfix service gets killed by OOM Killer from time to time


Good day from Singapore,


ClamAV consumes so much memory that my Postfix service gets killed by OOM Killer from time to time.


Please refer to the series of 44 discussion posts at the following mailing list archives.


Email Subject: [pfx] I have found out the reason why Postfix keeps getting killed by OOM Killer


Date range of discussion posts: 2 Mar 2025 to 3 Mar 2025


Links: 


[1] https://www.mail-archive.com/postfix-users@postfix.org/maillist.html


[2] https://marc.info/?t=174092337400001&r=1&w=2


[3] https://forum.virtualmin.com/t/i-have-found-out-the-reason-why-postfix-keeps-getting-killed-by-oom-killer/132370


Please refer to the output of LINUX command "systemctl status postfix" below.


● postfix.service - Postfix Mail Transport Agent

     Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; preset: disabled)

     Active: active (running) since Mon 2025-03-03 19:32:07 +08; 24h ago

    Process: 517226 ExecStartPre=/usr/sbin/restorecon -R /var/spool/postfix/pid (code=exited, status=0/SUCCESS)

    Process: 517227 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=0/SUCCESS)

    Process: 517230 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)

    Process: 517231 ExecStart=/usr/sbin/postfix start (code=exited, status=0/SUCCESS)

   Main PID: 517304 (master)

      Tasks: 15 (limit: 48939)

     Memory: 1.5G

        CPU: 9h 52min 10.702s

     CGroup: /system.slice/postfix.service

             ├─517304 /usr/libexec/postfix/master -w

             ├─517306 qmgr -l -t unix -u

             ├─517364 tlsmgr -l -t unix -u

             ├─810332 pickup -l -t unix -u

             ├─822550 smtpd -n smtps -t inet -u -o stress= -s 2 -o smtpd_sasl_auth_enable=yes -o smtpd_tls_security_level=may -o smtpd_tls_wrappermode=yes

             ├─822554 anvil -l -t unix -u

             ├─822919 smtpd -n smtp -t inet -u -o stress= -s 2 -o smtpd_sasl_auth_enable=yes -o smtpd_tls_security_level=may

             ├─822921 proxymap -t unix -u

             ├─823091 trivial-rewrite -n rewrite -t unix -u

             ├─823094 cleanup -z -t unix -u

             ├─823098 local -t unix

             ├─823100 /usr/bin/procmail-wrapper -o -a ns1.<REDACTED>.com -d ceo

             ├─823107 /usr/bin/perl /etc/webmin/virtual-server/clam-wrapper.pl /bin/clamscan

             ├─823108 sh -c "\\/bin\\/clamscan - >/tmp/clamwrapper.823107"

             └─823109 /bin/clamscan -


From the above output, it appears that clamscan is being used automatically.


When I login to my Virtualmin web hosting control panel, I will click Virtualmin at the top left, then click Email Settings > Spam and Virus Scanning.


Under the "Global spam and virus scanner options" tab, "Virus scanning program" option, the Standalone scanner (clamscan) was automatically selected. PLEASE NOTE THAT I HAVE NEVER CONFIGURED THIS SETTING BEFORE IN THE PAST. If I change the "Virus scanning program" option to Local server scanner (clamd), will my situation improve tremendously? Will the memory footprint reduce and bring about enhanced stability to my AlmaLinux 9.5 Virtual Private Server (VPS) in Germany?


I am looking forward to your reply.


Thank you very much.


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Targeted Individuals in Singapore

GIMP = Government-Induced Medical Problems

4th March 2025 Tuesday 8.47 PM Singapore Time





REFERENCES

=================


[1] https://lists.clamav.net/pipermail/clamav-users/2025-March/014144.html


[2] https://www.mail-archive.com/clamav-users@lists.clamav.net/msg53344.html


[3] https://marc.info/?l=clamav-users&m=174109233219318&w=2


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