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  1. the code:
  2.  
  3. int main()
  4. {
  5. while(1)
  6. {
  7. void *m = malloc(1024*1024);
  8. memset(m,0,1024*1024);
  9. }
  10. return 0;
  11. }
  12.  
  13. (the top answer from http://stackoverflow.com/questions/1865501/c-program-on-linux-to-exhaust-memory )
  14.  
  15.  
  16. vanessa@rainbird:~$ dmesg
  17. [400367.843850] pandacoin-qt invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0
  18. [400367.843856] pandacoin-qt cpuset=/ mems_allowed=0
  19. [400367.843861] CPU: 4 PID: 2002 Comm: pandacoin-qt Tainted: PF C O 3.13.0-35-generic #62-Ubuntu
  20. [400367.843863] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./M3A770DE , BIOS P1.70 09/07/2010
  21. [400367.843865] 0000000000000000 ffff8803ff511980 ffffffff8171e320 ffff8803ff764800
  22. [400367.843869] ffff8803ff511a08 ffffffff81718c34 0000000000000000 0000000000000000
  23. [400367.843872] 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  24. [400367.843874] Call Trace:
  25. [400367.843885] [<ffffffff8171e320>] dump_stack+0x45/0x56
  26. [400367.843888] [<ffffffff81718c34>] dump_header+0x7f/0x1f1
  27. [400367.843892] [<ffffffff81151e8e>] oom_kill_process+0x1ce/0x330
  28. [400367.843895] [<ffffffff812d46a5>] ? security_capable_noaudit+0x15/0x20
  29. [400367.843897] [<ffffffff811525c4>] out_of_memory+0x414/0x450
  30. [400367.843900] [<ffffffff8115893c>] __alloc_pages_nodemask+0xa5c/0xb80
  31. [400367.843903] [<ffffffff81196d43>] alloc_pages_current+0xa3/0x160
  32. [400367.843906] [<ffffffff8114ea87>] __page_cache_alloc+0x97/0xc0
  33. [400367.843908] [<ffffffff81150495>] filemap_fault+0x185/0x410
  34. [400367.843911] [<ffffffff8117510f>] __do_fault+0x6f/0x530
  35. [400367.843913] [<ffffffff811792b2>] handle_mm_fault+0x482/0xf00
  36. [400367.843916] [<ffffffff811d0fa0>] ? poll_select_copy_remaining+0x130/0x130
  37. [400367.843918] [<ffffffff8172a2e4>] __do_page_fault+0x184/0x560
  38. [400367.843921] [<ffffffff811da120>] ? fget_light+0x60/0xd0
  39. [400367.843923] [<ffffffff8172a6da>] do_page_fault+0x1a/0x70
  40. [400367.843925] [<ffffffff81726b48>] page_fault+0x28/0x30
  41. [400367.843927] Mem-Info:
  42. [400367.843928] Node 0 DMA per-cpu:
  43. [400367.843930] CPU 0: hi: 0, btch: 1 usd: 0
  44. [400367.843931] CPU 1: hi: 0, btch: 1 usd: 0
  45. [400367.843932] CPU 2: hi: 0, btch: 1 usd: 0
  46. [400367.843933] CPU 3: hi: 0, btch: 1 usd: 0
  47. [400367.843934] CPU 4: hi: 0, btch: 1 usd: 0
  48. [400367.843935] CPU 5: hi: 0, btch: 1 usd: 0
  49. [400367.843936] Node 0 DMA32 per-cpu:
  50. [400367.843938] CPU 0: hi: 186, btch: 31 usd: 0
  51. [400367.843939] CPU 1: hi: 186, btch: 31 usd: 0
  52. [400367.843940] CPU 2: hi: 186, btch: 31 usd: 0
  53. [400367.843941] CPU 3: hi: 186, btch: 31 usd: 0
  54. [400367.843942] CPU 4: hi: 186, btch: 31 usd: 0
  55. [400367.843943] CPU 5: hi: 186, btch: 31 usd: 0
  56. [400367.843944] Node 0 Normal per-cpu:
  57. [400367.843945] CPU 0: hi: 186, btch: 31 usd: 0
  58. [400367.843947] CPU 1: hi: 186, btch: 31 usd: 0
  59. [400367.843948] CPU 2: hi: 186, btch: 31 usd: 0
  60. [400367.843949] CPU 3: hi: 186, btch: 31 usd: 0
  61. [400367.843950] CPU 4: hi: 186, btch: 31 usd: 0
  62. [400367.843951] CPU 5: hi: 186, btch: 31 usd: 0
  63. [400367.843954] active_anon:3584937 inactive_anon:368654 isolated_anon:0
  64. [400367.843954] active_file:117 inactive_file:208 isolated_file:0
  65. [400367.843954] unevictable:1240 dirty:35 writeback:0 unstable:0
  66. [400367.843954] free:33607 slab_reclaimable:6640 slab_unreclaimable:12641
  67. [400367.843954] mapped:41119 shmem:14065 pagetables:21708 bounce:0
  68. [400367.843954] free_cma:0
  69. [400367.843957] Node 0 DMA free:15852kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
  70. [400367.843962] lowmem_reserve[]: 0 3102 16029 16029
  71. [400367.843964] Node 0 DMA32 free:64340kB min:13068kB low:16332kB high:19600kB active_anon:2745868kB inactive_anon:295380kB active_file:196kB inactive_file:904kB unevictable:440kB isolated(anon):0kB isolated(file):0kB present:3259072kB managed:3180128kB mlocked:440kB dirty:136kB writeback:0kB mapped:35768kB shmem:14572kB slab_reclaimable:3992kB slab_unreclaimable:9416kB kernel_stack:648kB pagetables:15316kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:1659 all_unreclaimable? yes
  72. [400367.843968] lowmem_reserve[]: 0 0 12926 12926
  73. [400367.843970] Node 0 Normal free:54236kB min:54448kB low:68060kB high:81672kB active_anon:11593880kB inactive_anon:1179236kB active_file:272kB inactive_file:0kB unevictable:4520kB isolated(anon):0kB isolated(file):0kB present:13500416kB managed:13237196kB mlocked:4520kB dirty:4kB writeback:0kB mapped:128708kB shmem:41688kB slab_reclaimable:22568kB slab_unreclaimable:41148kB kernel_stack:4240kB pagetables:71516kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:615 all_unreclaimable? yes
  74. [400367.843973] lowmem_reserve[]: 0 0 0 0
  75. [400367.843975] Node 0 DMA: 1*4kB (U) 1*8kB (U) 0*16kB 1*32kB (U) 1*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R) 3*4096kB (M) = 15852kB
  76. [400367.843983] Node 0 DMA32: 901*4kB (UEMR) 547*8kB (UEMR) 423*16kB (UEMR) 312*32kB (UER) 162*64kB (UEM) 72*128kB (UEMR) 37*256kB (EM) 15*512kB (ER) 2*1024kB (MR) 1*2048kB (R) 0*4096kB = 65564kB
  77. [400367.843991] Node 0 Normal: 415*4kB (UEM) 181*8kB (UEM) 1205*16kB (UEM) 503*32kB (UEM) 112*64kB (UEM) 36*128kB (U) 0*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB (R) = 54356kB
  78. [400367.843999] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
  79. [400367.844000] 15196 total pagecache pages
  80. [400367.844002] 0 pages in swap cache
  81. [400367.844003] Swap cache stats: add 1172370, delete 1172370, find 140904/166118
  82. [400367.844004] Free swap = 0kB
  83. [400367.844005] Total swap = 0kB
  84. [400367.844006] 4193870 pages RAM
  85. [400367.844007] 0 pages HighMem/MovableOnly
  86. [400367.844007] 65805 pages reserved
  87. [400367.844008] [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name
  88. [400367.844016] [ 619] 0 619 5855 186 17 0 0 rpcbind
  89. [400367.844018] [ 657] 0 657 3848 110 11 0 0 upstart-socket-
  90. [400367.844020] [ 670] 116 670 5386 266 16 0 0 rpc.statd
  91. [400367.844022] [ 782] 0 782 68176 669 128 0 0 smbd
  92. [400367.844025] [ 883] 102 883 10123 508 24 0 0 dbus-daemon
  93. [400367.844026] [ 912] 0 912 82559 435 64 0 0 ModemManager
  94. [400367.844028] [ 935] 0 935 3852 95 12 0 0 upstart-file-br
  95. [400367.844030] [ 937] 0 937 4823 142 13 0 0 bluetoothd
  96. [400367.844032] [ 949] 111 949 8088 189 21 0 0 avahi-daemon
  97. [400367.844034] [ 951] 111 951 8056 81 20 0 0 avahi-daemon
  98. [400367.844049] [ 970] 0 970 5870 71 16 0 0 rpc.idmapd
  99. [400367.844051] [ 975] 0 975 89897 511 72 0 0 NetworkManager
  100. [400367.844053] [ 983] 0 983 74083 840 48 0 0 polkitd
  101. [400367.844054] [ 988] 0 988 68176 561 126 0 0 smbd
  102. [400367.844056] [ 1102] 0 1102 5752 201 12 0 0 getty
  103. [400367.844058] [ 1106] 0 1106 5752 200 14 0 0 getty
  104. [400367.844059] [ 1116] 0 1116 5752 201 13 0 0 getty
  105. [400367.844061] [ 1117] 0 1117 5752 202 13 0 0 getty
  106. [400367.844062] [ 1120] 0 1120 5752 202 13 0 0 getty
  107. [400367.844064] [ 1174] 0 1174 1092 153 7 0 0 acpid
  108. [400367.844066] [ 1176] 0 1176 5914 212 17 0 0 cron
  109. [400367.844067] [ 1177] 0 1177 4785 40 13 0 0 atd
  110. [400367.844069] [ 1188] 109 1188 89834 641 75 0 0 whoopsie
  111. [400367.844071] [ 1246] 0 1246 73153 885 46 0 0 lightdm
  112. [400367.844072] [ 1268] 0 1268 75612 504 51 0 0 accounts-daemon
  113. [400367.844074] [ 1272] 104 1272 9554 138 17 0 0 dnsmasq
  114. [400367.844075] [ 1301] 0 1301 93753 275 30 0 0 automount
  115. [400367.844077] [ 1314] 0 1314 18871 384 42 0 0 cups-browsed
  116. [400367.844079] [ 1371] 0 1371 163767 86322 316 0 0 Xorg
  117. [400367.844081] [ 1416] 0 1416 1882 86 8 0 0 gpm
  118. [400367.844082] [ 1435] 106 1435 9286 152 21 0 0 kerneloops
  119. [400367.844084] [ 1486] 0 1486 7091 339 19 0 0 rpc.mountd
  120. [400367.844086] [ 1509] 0 1509 123767 1161 27 0 0 osspd
  121. [400367.844088] [ 1579] 0 1579 6938 120 18 0 0 saned
  122. [400367.844089] [ 1580] 0 1580 6938 87 18 0 0 saned
  123. [400367.844091] [ 1640] 118 1640 28684 1392 57 0 0 timidity
  124. [400367.844092] [ 1652] 0 1652 5752 203 13 0 0 getty
  125. [400367.844094] [ 1665] 0 1665 43105 386 54 0 0 lightdm
  126. [400367.844096] [ 1683] 1001 1683 10731 297 25 0 0 init
  127. [400367.844097] [ 1793] 1001 1793 2654 79 9 0 0 ssh-agent
  128. [400367.844099] [ 1802] 1001 1802 11802 1527 27 0 0 dbus-daemon
  129. [400367.844101] [ 1809] 1001 1809 6323 176 15 0 0 upstart-event-b
  130. [400367.844102] [ 1829] 1001 1829 8444 102 16 0 0 upstart-file-br
  131. [400367.844104] [ 1830] 1001 1830 6325 57 12 0 0 upstart-dbus-br
  132. [400367.844106] [ 1832] 1001 1832 6325 58 11 0 0 upstart-dbus-br
  133. [400367.844107] [ 1852] 1001 1852 91887 333 46 0 0 at-spi-bus-laun
  134. [400367.844109] [ 1856] 1001 1856 9811 266 25 0 0 dbus-daemon
  135. [400367.844110] [ 1859] 1001 1859 31227 234 30 0 0 at-spi2-registr
  136. [400367.844112] [ 1878] 1001 1878 49908 820 31 0 0 gvfsd
  137. [400367.844114] [ 1888] 1001 1888 90107 356 44 0 0 gvfsd-fuse
  138. [400367.844115] [ 1922] 1001 1922 1111 137 7 0 0 sh
  139. [400367.844117] [ 1933] 1001 1933 82413 1278 93 0 0 xfce4-session
  140. [400367.844118] [ 1936] 1001 1936 9863 270 24 0 0 xfconfd
  141. [400367.844120] [ 1940] 1001 1940 138984 1362 60 0 0 gnome-keyring-d
  142. [400367.844121] [ 1943] 1001 1943 144169 2140 107 0 0 xfwm4
  143. [400367.844123] [ 1948] 1001 1948 198612 1637 165 0 0 Thunar
  144. [400367.844124] [ 1950] 1001 1950 168867 2412 234 0 0 xfce4-panel
  145. [400367.844126] [ 1951] 1001 1951 217130 8109 245 0 0 xfdesktop
  146. [400367.844128] [ 1952] 1001 1952 86757 794 100 0 0 xfsettingsd
  147. [400367.844129] [ 1954] 0 1954 76228 952 48 0 0 upowerd
  148. [400367.844131] [ 2002] 1001 2002 443292 39575 380 0 0 pandacoin-qt
  149. [400367.844133] [ 2005] 1001 2005 183922 8383 152 0 0 xfce4-terminal
  150. [400367.844134] [ 2016] 1001 2016 61168 613 87 0 0 xfce4-power-man
  151. [400367.844136] [ 2086] 1001 2086 162092 2019 114 0 0 panel-6-weather
  152. [400367.844138] [ 2090] 1001 2090 37271 780 72 0 0 xfce4-netload-p
  153. [400367.844139] [ 2104] 1001 2104 38919 752 76 0 0 panel-7-cpugrap
  154. [400367.844141] [ 2106] 1001 2106 3706 180 12 0 0 gnome-pty-helpe
  155. [400367.844142] [ 2114] 1001 2114 39817 642 79 0 0 panel-4-systray
  156. [400367.844144] [ 2115] 1001 2115 11035 302 25 0 0 ssh
  157. [400367.844146] [ 2116] 1001 2116 162394 1353 122 0 0 panel-28-indica
  158. [400367.844147] [ 2125] 1001 2125 97096 1186 57 0 0 gvfs-udisks2-vo
  159. [400367.844149] [ 2129] 1001 2129 33791 758 65 0 0 xfce4-oragecloc
  160. [400367.844150] [ 2136] 0 2136 112946 1348 55 0 0 udisksd
  161. [400367.844152] [ 2204] 1001 2204 50817 252 35 0 0 gvfs-mtp-volume
  162. [400367.844154] [ 2208] 1001 2208 72238 322 40 0 0 gvfs-afc-volume
  163. [400367.844155] [ 2213] 1001 2213 53858 368 39 0 0 gvfs-gphoto2-vo
  164. [400367.844157] [ 2215] 1001 2215 15057 293 31 0 0 gconfd-2
  165. [400367.844158] [ 2218] 1001 2218 10665 295 23 0 0 init
  166. [400367.844160] [ 2221] 1001 2221 92234 460 47 0 0 indicator-messa
  167. [400367.844161] [ 2223] 1001 2223 74670 337 47 0 0 indicator-power
  168. [400367.844163] [ 2224] 1001 2224 124696 1124 78 0 0 indicator-sound
  169. [400367.844165] [ 2226] 1001 2226 71687 421 70 0 0 indicator-appli
  170. [400367.844166] [ 2248] 1001 2248 111102 800 88 0 0 pulseaudio
  171. [400367.844168] [ 2252] 107 2252 42229 210 19 0 0 rtkit-daemon
  172. [400367.844169] [ 2260] 1001 2260 149624 434 58 0 0 gvfsd-trash
  173. [400367.844171] [ 2273] 65534 2273 9554 175 22 0 0 dnsmasq
  174. [400367.844173] [ 2382] 0 2382 57626 471 110 1 0 winbindd
  175. [400367.844174] [ 2386] 0 2386 47862 383 90 0 0 nmbd
  176. [400367.844176] [ 2390] 0 2390 57626 457 111 0 0 winbindd
  177. [400367.844178] [ 2553] 1001 2553 120774 1045 102 0 0 update-notifier
  178. [400367.844179] [ 2557] 1001 2557 61316 695 89 0 0 polkit-gnome-au
  179. [400367.844181] [ 2567] 1001 2567 130885 2434 99 0 0 zeitgeist-datah
  180. [400367.844183] [ 2570] 1001 2570 222037 1328 124 0 0 nm-applet
  181. [400367.844184] [ 2580] 1001 2580 64151 2539 90 0 0 applet.py
  182. [400367.844187] [ 2587] 1001 2587 74525 466 46 0 0 zeitgeist-daemo
  183. [400367.844188] [ 2600] 1001 2600 64112 819 57 0 0 zeitgeist-fts
  184. [400367.844190] [ 2620] 1001 2620 3601 136 11 0 0 cat
  185. [400367.844192] [ 2732] 113 2732 77742 609 52 0 0 colord
  186. [400367.844197] [32302] 1001 32302 44577 277 23 0 0 dconf-service
  187. [400367.844202] [18215] 1001 18215 31947 327 32 0 0 gvfsd-metadata
  188. [400367.844204] [20698] 1001 20698 142310 1345 72 0 0 gvfsd-http
  189. [400367.844206] [18503] 1001 18503 222686 11371 180 0 0 xchat
  190. [400367.844208] [20644] 0 20644 4869 84 13 0 0 upstart-udev-br
  191. [400367.844210] [20647] 0 20647 12924 346 29 0 -1000 systemd-udevd
  192. [400367.844212] [20723] 0 20723 10863 262 26 0 0 systemd-logind
  193. [400367.844214] [27583] 101 27583 63961 775 28 1 0 rsyslogd
  194. [400367.844215] [27636] 0 27636 4797 144 15 0 0 irqbalance
  195. [400367.844217] [32688] 1001 32688 202978 4698 225 0 0 scp-dbus-servic
  196. [400367.844219] [32568] 0 32568 37850 639 41 0 0 cupsd
  197. [400367.844221] [32538] 1001 32538 381955 46620 460 24 0 chromium-browse
  198. [400367.844222] [32550] 1001 32550 1626 83 9 0 0 chrome-sandbox
  199. [400367.844224] [32551] 1001 32551 152283 2740 252 0 0 chromium-browse
  200. [400367.844226] [32557] 1001 32557 160479 2588 213 0 0 chromium-browse
  201. [400367.844227] [32590] 1001 32590 257515 24098 466 54 300 chromium-browse
  202. [400367.844229] [32601] 1001 32601 245070 5809 291 0 300 chromium-browse
  203. [400367.844231] [32616] 1001 32616 266512 11611 356 0 300 chromium-browse
  204. [400367.844232] [32648] 1001 32648 241996 5605 287 0 300 chromium-browse
  205. [400367.844234] [32652] 1001 32652 272104 25517 458 0 300 chromium-browse
  206. [400367.844236] [32661] 1001 32661 240972 4584 281 0 300 chromium-browse
  207. [400367.844237] [32743] 1001 32743 347700 53490 613 0 300 chromium-browse
  208. [400367.844239] [32767] 1001 32767 250168 10312 355 8 300 chromium-browse
  209. [400367.844241] [ 311] 1001 311 424351 8330 398 10 300 chromium-browse
  210. [400367.844242] [ 338] 1001 338 272216 26445 478 3 300 chromium-browse
  211. [400367.844244] [ 351] 1001 351 273972 34431 374 0 300 chromium-browse
  212. [400367.844245] [ 362] 1001 362 369324 117205 777 2 300 chromium-browse
  213. [400367.844247] [ 372] 1001 372 252530 12070 311 0 300 chromium-browse
  214. [400367.844249] [ 388] 1001 388 243357 6571 287 0 300 chromium-browse
  215. [400367.844250] [ 398] 1001 398 252994 12834 311 0 300 chromium-browse
  216. [400367.844252] [ 2919] 1001 2919 740836 7296 284 0 0 claws-mail
  217. [400367.844253] [ 5829] 1001 5829 259516 18303 368 0 300 chromium-browse
  218. [400367.844255] [ 6325] 1001 6325 265448 26875 344 0 300 chromium-browse
  219. [400367.844257] [ 8523] 0 8523 4301 1233 15 0 0 atop
  220. [400367.844258] [ 8949] 1001 8949 254459 13233 319 0 300 chromium-browse
  221. [400367.844260] [ 9089] 1001 9089 264414 22562 337 0 300 chromium-browse
  222. [400367.844261] [ 9191] 1001 9191 7098 335 18 0 0 bash
  223. [400367.844263] [ 9445] 1001 9445 7098 337 17 0 0 bash
  224. [400367.844265] [ 9471] 1001 9471 8042 367 21 0 0 top
  225. [400367.844266] [ 9680] 1001 9680 7098 357 17 0 0 bash
  226. [400367.844268] [ 9812] 1001 9812 16565 2984 32 0 0 gdb
  227. [400367.844269] [ 9816] 1001 9816 3351236 3335288 6521 0 0 a.out
  228. [400367.844270] Out of memory: Kill process 9816 (a.out) score 813 or sacrifice child
  229. [400367.844273] Killed process 9816 (a.out) total-vm:13404944kB, anon-rss:13340796kB, file-rss:356kB
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