As we have seen in our previous post “Understanding Linux OOM Killer and avoiding perticular process from being killed in case of Out of Memory” process which consumes more memory and this has more oom_score becomes the most probable process which gets killed first when a OOM killer gets invoked automatically in case of low memory situation.
Lets now try to invoke the low memory killer manually to see which process gets killed first, for this you can manually check “ps -ax” and then note down the individual process Ids and its respective oom_score ( from /proc/PID/oom_score) to later verification.
As we can see in Linux kernel source code documentation, linux kernel has something called “magic SysRq key” which is useful for create certain conditions irrespective of what the kernel is doing actively, one of this condition/situation is to try and invoke OOM killer manualy even if we are not if out of memory condition to see how kernel behaves if it actually goes to out of memory.
write a character to /proc/sysrq-trigger. e.g.: echo t > /proc/sysrq-trigger
the required command key to invoke OOM killer is “f” which is mentioned in documentation as,
‘f’ – Will call the oom killer to kill a memory hog process, but do not panic if nothing can be killed.
$ sudo chmod 777 /proc/sysrq-trigger $ sudo echo f > /proc/sysrq-trigger $ dmesg [73762.622372] sysrq: SysRq : Manual OOM execution
[73762.622679] kworker/0:2 invoked oom-killer: gfp_mask=0x24000c0, order=-1, oom_score_adj=0
[73762.622682] kworker/0:2 cpuset=/ mems_allowed=0
[73762.622687] CPU: 0 PID: 21512 Comm: kworker/0:2 Tainted: P OE 4.4.0-71-generic #92-Ubuntu
[73762.622689] Hardware name: Dell Inc. Studio XPS 1640/0U785D, BIOS A12 11/19/2009
[73762.622694] Workqueue: events moom_callback
[73762.622696] c1adf967 51c7b0b2 00000286 cc647e2c c13ac23f eaaf5df4 c2fe3600 cc647e6c
[73762.622701] c11da125 c19e654c eaaf5df4 024000c0 ffffffff 00000000 00000292 cc647e6c
[73762.622705] c13b1f5f c1b32c10 c1af6740 e52a7700 c2fe3a7c 00000000 c2fe3600 cc647ea4
[73762.622709] Call Trace:
[73762.622715] [] dump_stack+0x58/0x79
[73762.622719] [] dump_header.isra.9+0x44/0x175
[73762.622722] [] ? ___ratelimit+0x9f/0xf0
[73762.622725] [] oom_kill_process+0x1d2/0x390
[73762.622729] [] ? has_capability_noaudit+0x1a/0x30
[73762.622730] [] ? oom_badness.part.10+0x91/0x110
[73762.622733] [] out_of_memory+0x1b9/0x2f0
[73762.622735] [] moom_callback+0x44/0x80
[73762.622738] [] process_one_work+0x121/0x3f0
[73762.622741] [] worker_thread+0x37/0x490
[73762.622743] [] ? process_one_work+0x3f0/0x3f0
[73762.622746] [] kthread+0xa6/0xc0
[73762.622750] [] ret_from_kernel_thread+0x21/0x38
[73762.622752] [] ? kthread_create_on_node+0x170/0x170
[73762.622754] Mem-Info:
[73762.622758] active_anon:347006 inactive_anon:104141 isolated_anon:0
active_file:182592 inactive_file:82838 isolated_file:0
unevictable:16 dirty:131 writeback:0 unstable:0
slab_reclaimable:43256 slab_unreclaimable:6853
mapped:99402 shmem:36885 pagetables:6212 bounce:0
free:183054 free_pcp:613 free_cma:0
[73762.622766] DMA free:10232kB min:788kB low:984kB high:1180kB active_anon:0kB inactive_anon:0kB active_file:1680kB inactive_file:652kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15980kB managed:15904kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:2960kB slab_unreclaimable:272kB kernel_stack:24kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[73762.622768] lowmem_reserve[]: 0 785 3954 3954
[73762.622775] Normal free:223452kB min:39956kB low:49944kB high:59932kB active_anon:67484kB inactive_anon:28928kB active_file:199232kB inactive_file:87648kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:897016kB managed:842196kB mlocked:0kB dirty:24kB writeback:0kB mapped:29840kB shmem:6392kB slab_reclaimable:170064kB slab_unreclaimable:27140kB kernel_stack:5816kB pagetables:3296kB unstable:0kB bounce:0kB free_pcp:1216kB local_pcp:628kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[73762.622777] lowmem_reserve[]: 0 0 25354 25354
[73762.622784] HighMem free:498532kB min:512kB low:40808kB high:81104kB active_anon:1320540kB inactive_anon:387636kB active_file:529456kB inactive_file:243052kB unevictable:64kB isolated(anon):0kB isolated(file):0kB present:3245320kB managed:3245320kB mlocked:64kB dirty:500kB writeback:0kB mapped:367768kB shmem:141148kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:21552kB unstable:0kB bounce:0kB free_pcp:1236kB local_pcp:708kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[73762.622786] lowmem_reserve[]: 0 0 0 0
[73762.622788] DMA: 68*4kB (UE) 53*8kB (UME) 110*16kB (UME) 69*32kB (UME) 33*64kB (UME) 15*128kB (ME) 4*256kB (UM) 1*512kB (U) 0*1024kB 0*2048kB 0*4096kB = 10232kB
[73762.622800] Normal: 4317*4kB (UME) 2275*8kB (UME) 1058*16kB (UME) 667*32kB (UME) 462*64kB (UME) 239*128kB (UME) 110*256kB (UME) 50*512kB (UME) 19*1024kB (UME) 6*2048kB (M) 1*4096kB (M) = 223500kB
[73762.622811] HighMem: 30935*4kB (UM) 13603*8kB (UM) 2279*16kB (UM) 502*32kB (UM) 161*64kB (UM) 83*128kB (UM) 58*256kB (UM) 47*512kB (UM) 46*1024kB (UM) 28*2048kB (M) 12*4096kB (M) = 498532kB
[73762.622824] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[73762.622825] 314536 total pagecache pages
[73762.622827] 12220 pages in swap cache
[73762.622829] Swap cache stats: add 162551, delete 150331, find 502250/508311
[73762.622830] Free swap = 3601584kB
[73762.622831] Total swap = 4157436kB
[73762.622833] 1039579 pages RAM
[73762.622834] 811330 pages HighMem/MovableOnly
[73762.622835] 13724 pages reserved
[73762.622836] 0 pages cma reserved
[73762.622837] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name
[73762.622842] [ 285] 0 285 2534 701 7 3 33 0 systemd-journal
[73762.622844] [ 316] 0 316 3659 625 10 3 306 -1000 systemd-udevd
[73762.622847] [ 590] 134 590 3158 565 7 3 50 0 systemd-timesyn
[73762.622850] [ 896] 0 896 1935 998 8 3 34 0 bluetoothd
[73762.622852] [ 897] 0 897 1038 640 5 3 41 0 systemd-logind
[73762.622855] [ 901] 0 901 10609 1096 14 3 328 0 ModemManager
[73762.622857] [ 906] 0 906 872 503 5 3 38 0 atd
[73762.622860] [ 908] 107 908 1509 786 7 3 50 0 avahi-daemon
[73762.622862] [ 919] 101 919 7913 507 8 3 137 0 rsyslogd
[73762.622865] [ 933] 102 933 1786 1108 7 3 56 -900 dbus-daemon
[73762.622867] [ 982] 107 982 1482 5 7 3 67 0 avahi-daemon
[73762.622870] [ 994] 131 994 48786 4197 25 3 256 -900 postgres
[73762.622872] [ 998] 0 998 2219 873 9 3 178 0 ofonod
[73762.622875] [ 999] 0 999 26979 3714 25 3 158 0 NetworkManager
[73762.622877] [ 1019] 0 1019 1397 556 6 3 38 0 cron
[73762.622880] [ 1021] 0 1021 9706 1760 14 3 566 0 accounts-daemon
[73762.622882] [ 1023] 0 1023 561 266 5 3 7 0 acpid
[73762.622884] [ 1028] 0 1028 1330 284 6 3 53 0 cgmanager
[73762.622887] [ 1032] 0 1032 9224 1231 12 3 88 0 urfkilld
[73762.622889] [ 1053] 0 1053 215997 3205 23 3 109 -900 snapd
[73762.622892] [ 1132] 0 1132 10064 1641 15 3 75 0 polkitd
[73762.622894] [ 1150] 0 1150 1375 690 7 3 44 0 mbbservice
[73762.622897] [ 1165] 103 1165 10728 2199 16 3 389 0 colord
[73762.622899] [ 1175] 0 1175 1140 491 6 3 18 0 irqbalance
[73762.622902] [ 1190] 131 1190 49279 3623 25 3 256 -900 postgres
[73762.622904] [ 1211] 0 1211 11117 1613 14 3 101 0 lightdm
[73762.622907] [ 1220] 0 1220 2503 1244 8 3 0 -1000 sshd
[73762.622909] [ 1259] 130 1259 136301 8429 105 3 22941 0 mysqld
[73762.622912] [ 1269] 131 1269 48786 613 22 3 281 0 postgres
[73762.622914] [ 1270] 131 1270 48786 616 24 3 279 0 postgres
[73762.622916] [ 1271] 131 1271 48786 612 22 3 283 0 postgres
[73762.622919] [ 1272] 131 1272 48888 1046 24 3 326 0 postgres
[73762.622921] [ 1273] 131 1273 13317 428 19 3 256 0 postgres
[73762.622923] [ 1274] 0 1274 51200 7680 69 3 2864 0 Xorg
[73762.622926] [ 1301] 0 1301 3111 1348 9 3 256 0 bandwidthd
[73762.622928] [ 1302] 0 1302 3137 1341 9 3 315 0 bandwidthd
[73762.622931] [ 1303] 0 1303 3260 1331 10 3 436 0 bandwidthd
[73762.622933] [ 1304] 0 1304 2978 1310 9 3 183 0 bandwidthd
[73762.622936] [ 1314] 131 1314 49279 580 20 3 261 0 postgres
[73762.622938] [ 1315] 131 1315 49279 381 21 3 268 0 postgres
[73762.622941] [ 1316] 131 1316 49279 567 20 3 274 0 postgres
[73762.622943] [ 1317] 131 1317 49346 911 23 3 285 0 postgres
[73762.622945] [ 1318] 131 1318 13583 428 17 3 254 0 postgres
[73762.622948] [ 1429] 0 1429 2618 889 10 3 32 0 wpa_supplicant
[73762.622950] [ 1476] 105 1476 16887 2395 19 3 162 0 whoopsie
[73762.622952] [ 1546] 0 1546 701 1 5 3 29 0 in.tftpd
[73762.622955] [ 1547] 129 1547 1246 440 6 3 83 0 nrpe
[73762.622957] [ 1553] 0 1553 674 421 4 3 38 0 xinetd
[73762.622959] [ 1556] 0 1556 1187 334 6 3 29 0 agetty
[73762.622962] [ 1562] 0 1562 36650 314 29 3 175 0 teamviewerd
[73762.622964] [ 1604] 133 1604 4008 524 12 3 644 0 snmpd
[73762.622967] [ 1626] 0 1626 45926 8749 30 3 94 0 apache2
[73762.622969] [ 1772] 0 1772 7277 1735 12 3 144 0 lightdm
[73762.622971] [ 1834] 111 1834 5949 637 9 3 69 0 rtkit-daemon
[73762.622974] [ 1899] 1000 1899 1595 823 6 3 130 0 systemd
[73762.622976] [ 1900] 1000 1900 6777 59 10 3 341 0 (sd-pam)
[73762.622978] [ 1952] 1000 1952 16069 2245 17 3 553 0 gnome-keyring-d
[73762.622981] [ 1954] 1000 1954 2133 896 9 3 41 0 upstart
[73762.622983] [ 2061] 65534 2061 2282 805 8 3 52 0 dnsmasq
[73762.622985] [ 2192] 1000 2192 1855 21 7 3 37 0 upstart-udev-br
[73762.622988] [ 2204] 1000 2204 1827 1011 8 3 50 0 dbus-daemon
[73762.622990] [ 2209] 1000 2209 592 152 5 3 16 0 sh
[73762.622993] [ 2219] 1000 2219 11456 1230 16 3 87 0 window-stack-br
[73762.622995] [ 2227] 1000 2227 16828 1859 18 3 162 0 url-dispatcher
[73762.622997] [ 2281] 1000 2281 18941 4094 29 3 868 0 bamfdaemon
[73762.623000] [ 2284] 1000 2284 1868 378 6 3 52 0 upstart-dbus-br
[73762.623002] [ 2285] 1000 2285 1932 486 7 3 33 0 upstart-dbus-br
[73762.623005] [ 2295] 1000 2295 11872 1142 13 3 37 0 gvfsd
[73762.623007] [ 2300] 1000 2300 12930 1003 13 3 95 0 gvfsd-fuse
[73762.623009] [ 2319] 1000 2319 6388 1136 10 3 44 0 dconf-service
[73762.623012] [ 2325] 1000 2325 12757 3001 17 3 42 0 ibus-daemon
[73762.623014] [ 2332] 1000 2332 1950 314 7 3 70 0 upstart-file-br
[73762.623016] [ 2347] 1000 2347 9379 1115 11 3 48 0 ibus-dconf
[73762.623019] [ 2348] 1000 2348 24939 4867 31 3 450 0 ibus-ui-gtk3
[73762.623021] [ 2350] 1000 2350 15935 3208 26 3 313 0 ibus-x11
[73762.623024] [ 2372] 1000 2372 6027 49 8 3 20 0 gpg-agent
[73762.623026] [ 2385] 1000 2385 7046 944 11 3 38 0 ibus-engine-sim
[73762.623029] [ 2400] 1000 2400 47772 16264 66 3 405 0 hud-service
[73762.623031] [ 2402] 1000 2402 132281 4951 41 3 318 0 unity-settings-
[73762.623034] [ 2408] 1000 2408 11143 1105 13 3 71 0 at-spi-bus-laun
[73762.623036] [ 2413] 1000 2413 1518 785 7 3 54 0 dbus-daemon
[73762.623038] [ 2414] 1000 2414 23484 2970 25 3 1308 0 gnome-session-b
[73762.623041] [ 2418] 1000 2418 30680 7197 37 3 193 0 unity-panel-ser
[73762.623043] [ 2429] 1000 2429 7295 1435 12 3 70 0 at-spi2-registr
[73762.623045] [ 2456] 1000 2456 11993 1299 14 3 74 0 indicator-messa
[73762.623048] [ 2457] 1000 2457 13345 1135 13 3 34 0 indicator-bluet
[73762.623050] [ 2458] 1000 2458 18524 1405 17 3 435 0 indicator-power
[73762.623053] [ 2467] 1000 2467 33450 2062 31 3 244 0 indicator-datet
[73762.623055] [ 2469] 1000 2469 30310 3530 33 3 495 0 indicator-keybo
[73762.623057] [ 2470] 1000 2470 80869 2077 24 3 1168 0 indicator-sound
[73762.623060] [ 2471] 1000 2471 21404 3479 30 3 531 0 indicator-print
[73762.623062] [ 2472] 1000 2472 17659 1235 20 3 20 0 indicator-sessi
[73762.623064] [ 2489] 1000 2489 14784 2235 19 3 227 0 indicator-appli
[73762.623067] [ 2493] 0 2493 20229 1837 19 3 130 0 upowerd
[73762.623069] [ 2499] 1000 2499 24890 5155 32 3 119 0 notify-osd
[73762.623072] [ 2517] 1000 2517 44187 2385 37 3 198 0 pulseaudio
[73762.623074] [ 2523] 1000 2523 35311 2663 38 3 516 0 evolution-sourc
[73762.623076] [ 2536] 1000 2536 3832 522 11 3 151 0 gconf-helper
[73762.623079] [ 2538] 1000 2538 2906 1132 10 3 59 0 gconfd-2
[73762.623081] [ 2568] 1000 2568 75151 14218 116 3 3571 0 compiz
[73762.623084] [ 2576] 1000 2576 34200 6122 43 3 1580 0 blueman-applet
[73762.623086] [ 2591] 1000 2591 80734 26718 98 3 3492 0 nautilus
[73762.623088] [ 2592] 1000 2592 19989 2947 28 3 1390 0 unity-fallback-
[73762.623091] [ 2596] 1000 2596 15851 3046 27 3 322 0 polkit-gnome-au
[73762.623093] [ 2597] 1000 2597 48418 11518 69 3 6562 0 gnome-software
[73762.623096] [ 2600] 1000 2600 30180 5071 34 3 878 0 nm-applet
[73762.623098] [ 2615] 1000 2615 10004 1254 14 3 82 0 gvfs-udisks2-vo
[73762.623100] [ 2634] 1000 2634 47431 3030 42 3 1750 0 goa-daemon
[73762.623103] [ 2638] 0 2638 13706 1468 14 3 236 0 udisksd
[73762.623105] [ 2648] 1000 2648 1019 486 6 3 47 0 syndaemon
[73762.623107] [ 2651] 1000 2651 9256 1447 13 3 581 0 gvfs-mtp-volume
[73762.623110] [ 2662] 1000 2662 9564 1475 14 3 599 0 gvfs-gphoto2-vo
[73762.623112] [ 2665] 1000 2665 41181 2925 52 3 6369 0 evolution-calen
[73762.623115] [ 2671] 1000 2671 9224 1332 13 3 33 0 gvfs-goa-volume
[73762.623117] [ 2681] 0 2681 30309 6590 31 3 713 -900 fwupd
[73762.623131] [ 2699] 1000 2699 9629 1027 14 3 1145 0 goa-identity-se
[73762.623134] [ 2704] 1000 2704 13131 1485 15 3 109 0 mission-control
[73762.623136] [ 2707] 1000 2707 19967 1686 17 3 107 0 gvfs-afc-volume
[73762.623139] [ 2726] 1000 2726 11934 1062 14 3 59 0 gvfsd-trash
[73762.623141] [ 2733] 1000 2733 11873 889 12 3 133 0 gvfsd-burn
[73762.623144] [ 2756] 1000 2756 39535 1200 43 3 7524 0 evolution-calen
[73762.623146] [ 2766] 1000 2766 29664 1955 32 3 1007 0 evolution-addre
[73762.623148] [ 2768] 1000 2768 37115 1525 43 3 6446 0 evolution-calen
[73762.623150] [ 2788] 1000 2788 31387 2616 34 3 349 0 evolution-addre
[73762.623153] [ 2820] 1000 2820 13632 1281 18 3 220 0 obexd
[73762.623155] [ 2823] 1000 2823 26236 3042 31 3 499 0 telepathy-indic
[73762.623158] [ 2835] 1000 2835 22272 3286 29 3 759 0 zeitgeist-datah
[73762.623160] [ 2841] 1000 2841 592 140 5 3 17 0 sh
[73762.623163] [ 2848] 1000 2848 13340 1596 13 3 68 0 zeitgeist-daemo
[73762.623165] [ 2857] 1000 2857 153322 105513 285 3 32708 0 zeitgeist-fts
[73762.623168] [ 2865] 1000 2865 27504 2360 28 3 943 0 unity-scope-hom
[73762.623170] [ 2885] 1000 2885 7928 1951 13 3 32 0 gvfsd-metadata
[73762.623172] [ 2897] 1000 2897 29340 2347 29 3 1236 0 unity-scope-loa
[73762.623175] [ 2898] 1000 2898 26626 1844 23 3 1218 0 unity-files-dae
[73762.623177] [ 2899] 1000 2899 18796 1475 22 3 880 0 unity-music-dae
[73762.623179] [ 2937] 1000 2937 257356 64795 331 2 1343 0 chromium-browse
[73762.623182] [ 2948] 1000 2948 53129 4149 63 3 734 0 chromium-browse
[73762.623184] [ 2950] 1000 2950 53129 2319 57 3 701 0 chromium-browse
[73762.623187] [ 3261] 1000 3261 18632 4033 28 3 350 0 update-notifier
[73762.623189] [ 3299] 1000 3299 44446 8586 65 3 4348 0 update-manager
[73762.623192] [ 3417] 1000 3417 88967 22222 114 3 1069 200 chromium-browse
[73762.623194] [ 3432] 1000 3432 52171 2166 61 3 1725 200 chromium-browse
[73762.623196] [ 4389] 1000 4389 16144 1305 16 3 72 0 deja-dup-monito
[73762.623199] [12304] 1000 12304 34344 10909 45 3 6 0 gnome-terminal-
[73762.623201] [12312] 1000 12312 2108 1541 8 3 0 0 bash
[73762.623203] [13178] 1000 13178 126571 38300 248 3 671 300 chromium-browse
[73762.623206] [14197] 1000 14197 1908 1306 7 3 1 0 bash
[73762.623208] [15329] 141 15329 3908 827 8 3 0 0 ntpd
[73762.623210] [15784] 1000 15784 1904 1305 7 3 0 0 bash
[73762.623213] [16281] 1000 16281 1910 1309 7 3 2 0 bash
[73762.623215] [16351] 1000 16351 1909 1296 7 3 0 0 bash
[73762.623217] [20848] 1000 20848 12032 1319 14 3 0 0 gvfsd-network
[73762.623220] [20894] 1000 20894 12222 1387 15 3 0 0 gvfsd-dnssd
[73762.623222] [26026] 1000 26026 113701 31532 213 3 665 300 chromium-browse
[73762.623225] [26596] 1000 26596 87171 14680 131 3 680 300 chromium-browse
[73762.623227] [27962] 1000 27962 1907 1294 7 3 0 0 bash
[73762.623230] [ 1496] 1000 1496 1893 1224 7 3 55 0 bash
[73762.623232] [ 2353] 1000 2353 825 509 5 3 0 0 netserver
[73762.623234] [ 2354] 1000 2354 1893 1271 7 3 0 0 bash
[73762.623237] [ 9718] 33 9718 46038 3049 25 3 92 0 apache2
[73762.623239] [ 9720] 33 9720 46009 2718 24 3 92 0 apache2
[73762.623242] [ 9721] 33 9721 46022 3033 24 3 92 0 apache2
[73762.623244] [ 9722] 33 9722 46034 3019 25 3 92 0 apache2
[73762.623246] [ 9727] 0 9727 3683 1636 11 3 0 0 cupsd
[73762.623249] [ 9729] 0 9729 9393 2624 16 3 0 0 cups-browsed
[73762.623251] [ 9992] 1000 9992 191240 75261 424 3 661 300 chromium-browse
[73762.623254] [12100] 1000 12100 1908 1281 7 3 0 0 bash
[73762.623256] [12183] 1000 12183 3772 1803 10 3 0 0 vim
[73762.623259] [12253] 1000 12253 1908 1316 7 3 0 0 bash
[73762.623261] [12571] 1000 12571 1904 1280 7 3 0 0 bash
[73762.623263] [13048] 33 13048 46034 3039 25 3 92 0 apache2
[73762.623266] [13052] 33 13052 46005 2694 24 3 92 0 apache2
[73762.623268] [13097] 33 13097 45989 2565 24 3 92 0 apache2
[73762.623270] [13098] 33 13098 45989 2566 24 3 92 0 apache2
[73762.623273] [13099] 33 13099 45989 2568 24 3 92 0 apache2
[73762.623275] [13100] 33 13100 45989 2568 24 3 92 0 apache2
[73762.623278] [15209] 1000 15209 90041 17873 142 3 664 300 chromium-browse
[73762.623280] [19265] 1000 19265 135289 38925 267 3 661 300 chromium-browse
[73762.623283] [19646] 1000 19646 117042 41462 260 3 663 300 chromium-browse
[73762.623286] [20041] 1000 20041 118053 37555 250 3 663 300 chromium-browse
[73762.623288] [20616] 0 20616 1503 794 6 3 0 0 dhclient
[73762.623291] [21670] 1000 21670 30709 9656 39 3 0 0 gedit
[73762.623293] [21746] 0 21746 2244 1053 8 3 0 0 sudo
[73762.623296] [21747] 0 21747 1069 137 6 3 0 0 echo
[73762.623298] Out of memory: Kill process 9992 (chromium-browse) score 336 or sacrifice child
[73762.623304] Killed process 9992 (chromium-browse) total-vm:764960kB, anon-rss:184248kB, file-rss:116796kB
As we can see from last two lines, OOM Killer killed process with process ID 9992 and which has oom_score as 336 which was largest compared to all other running processes ( if you have noted before invoking OOM killer manually, you can easily cross verify )
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