Dear Varadi Gabor, I have just asked ChatGPT Artificial Intelligence (AI) for assistance.
ChatGPT says: To find out which process was killed by the OOM (Out-of-Memory) Killer in Linux, you can check the system logs. Here are some methods: <---snipped---> [root@ns1 ~]# dmesg | grep -i 'oom' [ 78.018901] php-fpm invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [ 78.031854] oom_kill_process.cold+0xb/0x10 [ 78.068033] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [ 78.158715] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/user.slice/user-0.slice/user@0.service/init.scope,task=(sd-pam),pid=1607,uid=0 [ 78.160661] Out of memory: Killed process 1607 ((sd-pam)) total-vm:171964kB, anon-rss:3400kB, file-rss:128kB, shmem-rss:0kB, UID:0 pgtables:96kB oom_score_adj:100 [ 84.110095] miniserv.pl invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [ 84.127387] oom_kill_process.cold+0xb/0x10 [ 84.190540] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [ 84.285733] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/user.slice/user-0.slice/user@0.service/init.scope,task=systemd,pid=1598,uid=0 [ 84.286855] Out of memory: Killed process 1598 (systemd) total-vm:21696kB, anon-rss:1664kB, file-rss:256kB, shmem-rss:0kB, UID:0 pgtables:80kB oom_score_adj:100 [ 84.999949] isc-net-0001 invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [ 85.004541] oom_kill_process.cold+0xb/0x10 [ 85.070926] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [ 85.155010] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-clamd.slice/clamd@scan.service,task=clamd,pid=825,uid=985 [ 85.156486] Out of memory: Killed process 825 (clamd) total-vm:674500kB, anon-rss:639940kB, file-rss:128kB, shmem-rss:0kB, UID:985 pgtables:1348kB oom_score_adj:0 [ 99.914825] proftpd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [ 100.065504] oom_kill_process.cold+0xb/0x10 [ 100.109973] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [ 100.188960] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/postfix.service,task=clamscan,pid=1231,uid=1005 [ 100.190130] Out of memory: Killed process 1231 (clamscan) total-vm:691484kB, anon-rss:663164kB, file-rss:256kB, shmem-rss:0kB, UID:1005 pgtables:1376kB oom_score_adj:0 [60280.450194] clamscan invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [60280.702595] oom_kill_process.cold+0xb/0x10 [60280.924370] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [60281.260249] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/user.slice/user-1002.slice/user@1002.service/app.slice/dbus.socket,task=systemctl,pid=90838,uid=1002 [60281.263738] Out of memory: Killed process 90838 (systemctl) total-vm:19340kB, anon-rss:640kB, file-rss:128kB, shmem-rss:0kB, UID:1002 pgtables:68kB oom_score_adj:200 [60283.089750] clamscan invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [60283.103578] oom_kill_process.cold+0xb/0x10 [60283.154127] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [60283.233270] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/user.slice/user-1002.slice/user@1002.service/app.slice/systemd-tmpfiles-setup.service,task=systemd-tmpfile,pid=90841,uid=1002 [60283.234304] Out of memory: Killed process 90841 (systemd-tmpfile) total-vm:19168kB, anon-rss:128kB, file-rss:128kB, shmem-rss:0kB, UID:1002 pgtables:64kB oom_score_adj:200 [60304.740746] irqbalance invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [60304.745377] oom_kill_process.cold+0xb/0x10 [60304.839068] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [60304.990425] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-clamd.slice/clamd@scan.service,task=clamd,pid=3255,uid=985 [60304.991455] Out of memory: Killed process 3255 (clamd) total-vm:1431788kB, anon-rss:1309028kB, file-rss:128kB, shmem-rss:0kB, UID:985 pgtables:2648kB oom_score_adj:0 [60379.882337] trivial-rewrite invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [60379.892097] oom_kill_process.cold+0xb/0x10 [60379.934668] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [60379.997598] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/postfix.service,task=clamscan,pid=90501,uid=1005 [60379.998826] Out of memory: Killed process 90501 (clamscan) total-vm:1351868kB, anon-rss:1289192kB, file-rss:128kB, shmem-rss:0kB, UID:1005 pgtables:2636kB oom_score_adj:0 [182836.799922] sshd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [182836.818031] oom_kill_process.cold+0xb/0x10 [182836.913763] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [182836.990573] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-clamd.slice/clamd@scan.service,task=clamd,pid=90850,uid=985 [182836.995418] Out of memory: Killed process 90850 (clamd) total-vm:1431788kB, anon-rss:1309080kB, file-rss:128kB, shmem-rss:0kB, UID:985 pgtables:2652kB oom_score_adj:0 [183144.553392] httpd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 [183144.568870] oom_kill_process.cold+0xb/0x10 [183144.612331] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [183144.727108] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-clamd.slice/clamd@scan.service,task=clamd,pid=519657,uid=985 [183144.728409] Out of memory: Killed process 519657 (clamd) total-vm:1431788kB, anon-rss:1289492kB, file-rss:256kB, shmem-rss:0kB, UID:985 pgtables:2652kB oom_score_adj:0 [root@ns1 ~]# [root@ns1 ~]# journalctl -k | grep -i 'oom' Mar 03 19:41:38 ns1.<REDACTED>.com kernel: sshd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 Mar 03 19:41:39 ns1.<REDACTED>.com kernel: oom_kill_process.cold+0xb/0x10 Mar 03 19:41:39 ns1.<REDACTED>.com kernel: [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name Mar 03 19:41:39 ns1.<REDACTED>.com kernel: oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-clamd.slice/clamd@scan.service,task=clamd,pid=90850,uid=985 Mar 03 19:41:39 ns1.<REDACTED>.com kernel: Out of memory: Killed process 90850 (clamd) total-vm:1431788kB, anon-rss:1309080kB, file-rss:128kB, shmem-rss:0kB, UID:985 pgtables:2652kB oom_score_adj:0 Mar 03 19:46:47 ns1.<REDACTED>.com kernel: httpd invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0 Mar 03 19:46:47 ns1.<REDACTED>.com kernel: oom_kill_process.cold+0xb/0x10 Mar 03 19:46:47 ns1.<REDACTED>.com kernel: [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name Mar 03 19:46:47 ns1.<REDACTED>.com kernel: oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/system-clamd.slice/clamd@scan.service,task=clamd,pid=519657,uid=985 Mar 03 19:46:47 ns1.<REDACTED>.com kernel: Out of memory: Killed process 519657 (clamd) total-vm:1431788kB, anon-rss:1289492kB, file-rss:256kB, shmem-rss:0kB, UID:985 pgtables:2652kB oom_score_adj:0 [root@ns1 ~]# Regards, Mr. Turritopsis Dohrnii Teo En Ming Targeted Individuals in Singapore GIMP = Government-Induced Medical Problems 3rd March 2025 Monday On Monday, March 3rd, 2025 at 10:09 PM, Varadi Gabor via Postfix-users <postfix-users@postfix.org> wrote: > 2025. 03. 02. 14:50 keltezéssel, Turritopsis Dohrnii Teo En Ming via > Postfix-users írta: > > > But until now I still have no idea why 115 messages stuck in the mail queue > > will cause postfix to consume ENORMOUS amounts of RAM and cause it to get > > killed by the OOM Killer. OOM = Out of Memory. > > > > In the syslog or whatever it is, isn't it in the OOM KILLER section what > exactly killed it? > > -- process name, > -- pid, > -- memory allocation, etc. > > -- > [Varadi Gabor] > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
