Re: oops when swapping on latest kernel git 3.15-rc5

From: Hugh Dickins
Date: Sun May 18 2014 - 15:17:13 EST

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On Sun, 18 May 2014, Branimir Maksimovic wrote:

> Ia hev discovered this accidentaly when tried to see how oom killer
> works. Program is this:
>
> #include <unistd.h>
> #include <cstring>
> #include <exception>
> #include <iostream>
>
> int counter=0;
> int main()
> try
> {
> for(;;++counter)
> {
> char* p = new char[1024*1024];
> memset(p,1,1024*1024);
> std::cout<<counter<<'\n';
> // if(counter > 24000)sleep(100);
>
> }
> }catch(const std::exception& e)
> {
> std::cout<<"exception:"<<e.what()<<" count:"<<counter<<std::endl;
> }
>
> After running this program system froze after some time. Programs could be
> started but they will not finish.
> Fortunatelly I could paste dmesg output:
>
> [ 388.522421] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000340
> [ 388.522427] IP: [<ffffffff81185b0b>]
> get_mem_cgroup_from_mm.isra.42+0x2b/0x60

Thank you very much for reporting. That BUG is a 3.15-rc regression.
3.14's try_get_mem_cgroup_from_mm() had protection against NULL mm,
as when exiting. That was correctly removed as unnecessary by one
3.15 commit, but a new caller added in a later commit: which made
it necessary again, as you have now found.

Easily fixable, but opinions will differ on the right way to write it
(and I'm rather out of touch with the current flux in css_tryget and
root_mem_cgroup), so Cc'ing Hannes and Michal for the definitive fix.

> [ 388.522435] PGD 3f233c067 PUD 3f20f7067 PMD 0
> [ 388.522439] Oops: 0000 [#1] SMP
> [ 388.522441] Modules linked in: snd_hrtimer pci_stub vboxpci(OE)
> vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) cuse rfcomm bnep bluetooth
> binfmt_misc intel_rapl x86_pkg_temp_thermal intel_powerclamp crct10dif_pclmul
> crc32_pclmul ghash_clmulni_intel aesni_intel snd_hda_codec_hdmi aes_x86_64
> lrw gf128mul glue_helper snd_hda_codec_realtek snd_hda_codec_generic
> ablk_helper cryptd gspca_spca561 gspca_main videodev mxm_wmi snd_hda_intel
> snd_hda_controller snd_hda_codec microcode snd_hwdep joydev snd_pcm
> snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq dm_multipath scsi_dh
> snd_seq_device snd_timer mei_me snd mei lpc_ich wmi soundcore video mac_hid
> serio_raw parport_pc ppdev nct6775 hwmon_vid coretemp nvidia(POE) drm lp
> parport btrfs xor raid6_pq hid_generic usbhid hid psmouse e1000e ahci libahci
> ptp pps_core
> [ 388.522494] CPU: 1 PID: 160 Comm: kworker/u8:5 Tainted: P OE
> 3.15.0-rc5-core2-custom #159
> [ 388.522496] Hardware name: System manufacturer System Product Name/MAXIMUS
> V GENE, BIOS 1903 08/19/2013
> [ 388.522498] task: ffff880404e349b0 ti: ffff88040486a000 task.ti:
> ffff88040486a000
> [ 388.522500] RIP: 0010:[<ffffffff81185b0b>] [<ffffffff81185b0b>]
> get_mem_cgroup_from_mm.isra.42+0x2b/0x60
> [ 388.522504] RSP: 0000:ffff88040486bab8 EFLAGS: 00010246
> [ 388.522506] RAX: 0000000000000000 RBX: ffffea000a416340 RCX:
> 0000000000000a40
> [ 388.522508] RDX: ffff88041efe8a40 RSI: ffffea000a416340 RDI:
> 0000000000000340
> [ 388.522509] RBP: ffff88040486bab8 R08: 000000000001cb56 R09:
> 0000000000072d5a
> [ 388.522511] R10: 0000000000000000 R11: 0000000000000005 R12:
> ffff88040486bb00
> [ 388.522512] R13: 00000000000000d0 R14: 0000000000000000 R15:
> ffff8803f3fe82f8
> [ 388.522515] FS: 0000000000000000(0000) GS:ffff88041ec80000(0000)
> knlGS:0000000000000000
> [ 388.522517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 388.522518] CR2: 0000000000000340 CR3: 00000003ee44d000 CR4:
> 00000000001407e0
> [ 388.522520] Stack:
> [ 388.522521] ffff88040486baf0 ffffffff8118abf5 ffffffff8112ce1a
> 0000000000000000
> [ 388.522524] ffffea000a416340 0000000000000003 00000000ffffffef
> ffff88040486bb18
> [ 388.522527] ffffffff8118b1cc ffff88040486baf8 000000000001cb56
> 0000000000000000
> [ 388.522530] Call Trace:
> [ 388.522536] [<ffffffff8118abf5>] __mem_cgroup_try_charge_swapin+0x45/0xf0
> [ 388.522539] [<ffffffff8112ce1a>] ? __lock_page+0x6a/0x70
> [ 388.522543] [<ffffffff8118b1cc>] mem_cgroup_charge_file+0x9c/0xe0
> [ 388.522548] [<ffffffff8114599c>] shmem_getpage_gfp+0x62c/0x770
> [ 388.522552] [<ffffffff81145b18>] shmem_write_begin+0x38/0x40
> [ 388.522555] [<ffffffff8112d1c5>] generic_perform_write+0xc5/0x1c0
> [ 388.522559] [<ffffffff811ad53a>] ? file_update_time+0x8a/0xd0
> [ 388.522563] [<ffffffff8112f211>] __generic_file_aio_write+0x1d1/0x3f0
> [ 388.522567] [<ffffffff81084fc1>] ? enqueue_entity+0x291/0xb90
> [ 388.522570] [<ffffffff8112f47f>] generic_file_aio_write+0x4f/0xc0
> [ 388.522574] [<ffffffff81192eaa>] do_sync_write+0x5a/0x90
> [ 388.522578] [<ffffffff810c53c1>] do_acct_process+0x4b1/0x550
> [ 388.522582] [<ffffffff810c5acd>] acct_process+0x6d/0xa0
> [ 388.522587] [<ffffffff810667d0>] ? manage_workers.isra.25+0x2a0/0x2a0
> [ 388.522590] [<ffffffff8104d937>] do_exit+0x827/0xa70
> [ 388.522594] [<ffffffff8106699e>] ? worker_thread+0x1ce/0x3a0
> [ 388.522597] [<ffffffff810667d0>] ? manage_workers.isra.25+0x2a0/0x2a0
> [ 388.522600] [<ffffffff8106cad3>] kthread+0xc3/0xf0
> [ 388.522604] [<ffffffff8106ca10>] ? kthread_create_on_node+0x180/0x180
> [ 388.522608] [<ffffffff816bfe6c>] ret_from_fork+0x7c/0xb0
> [ 388.522611] [<ffffffff8106ca10>] ? kthread_create_on_node+0x180/0x180

Or does that backtrace say that it's a kernel thread that was exiting
(and being accounted)? A kernel thread would not have had an mm in the
first place.

I know very little about accounting (acct_process etc). You said above
"Programs could be started but they will not finish": I'll assume that
hitting such a BUG inside acct_process() led to that.

> [ 388.522613] Code: 0f 1f 44 00 00 55 48 89 e5 eb 20 0f 1f 44 00 00 f6 40 48
> 01 75 3a 48 8b 50 18 f6 c2 03 75 33 65 ff 02 ba 01 00 00 00 84 d2 75 25 <48>
> 8b 07 48 85 c0 74 10 48 8b 80 20 08 00 00 48 8b 40 60 48 85
> [ 388.522644] RIP [<ffffffff81185b0b>]
> get_mem_cgroup_from_mm.isra.42+0x2b/0x60
> [ 388.522648] RSP <ffff88040486bab8>
> [ 388.522649] CR2: 0000000000000340
> [ 388.522652] ---[ end trace 1b08285a09489a81 ]---
> [ 388.522654] Fixing recursive fault but reboot is needed!

Then a good interval of 85 seconds.

> [ 473.905138] alloc invoked oom-killer: gfp_mask=0x280da, order=0,
> oom_score_adj=0
> [ 473.905144] alloc cpuset=/ mems_allowed=0
> [ 473.905150] CPU: 0 PID: 31463 Comm: alloc Tainted: P D OE
> 3.15.0-rc5-core2-custom #159
> [ 473.905152] Hardware name: System manufacturer System Product Name/MAXIMUS
> V GENE, BIOS 1903 08/19/2013
> [ 473.905154] 0000000000000000 ffff88040794da68 ffffffff816b03eb
> ffff8803c4d50000
> [ 473.905158] ffff88040794daf0 ffffffff816ad5bc ffffffff8104b176
> ffff88040794dac8
> [ 473.905161] ffffffff810a9a1c 000000000001a932 00000000000280da
> 0000000000000003
> [ 473.905164] Call Trace:
> [ 473.905173] [<ffffffff816b03eb>] dump_stack+0x45/0x56
> [ 473.905177] [<ffffffff816ad5bc>] dump_header+0x7b/0x1e9
> [ 473.905182] [<ffffffff8104b176>] ? put_online_cpus+0x56/0x80
> [ 473.905185] [<ffffffff810a9a1c>] ? rcu_oom_notify+0xcc/0xf0
> [ 473.905190] [<ffffffff81130af1>] oom_kill_process+0x201/0x350
> [ 473.905194] [<ffffffff81131292>] out_of_memory+0x492/0x4d0
> [ 473.905198] [<ffffffff81137006>] __alloc_pages_nodemask+0x9d6/0xac0
> [ 473.905204] [<ffffffff8117620a>] alloc_pages_vma+0x9a/0x160
> [ 473.905209] [<ffffffff81157b32>] handle_mm_fault+0xba2/0xeb0
> [ 473.905214] [<ffffffff816bac26>] __do_page_fault+0x176/0x540
> [ 473.905218] [<ffffffff810f00ec>] ? acct_account_cputime+0x1c/0x20
> [ 473.905221] [<ffffffff8107f6a7>] ? account_user_time+0x87/0x90
> [ 473.905224] [<ffffffff8107fbc0>] ? vtime_account_user+0x40/0x60
> [ 473.905227] [<ffffffff816bb00e>] do_page_fault+0x1e/0x70
> [ 473.905231] [<ffffffff816b7a22>] page_fault+0x22/0x30
> [ 473.905233] Mem-Info:
> [ 473.905235] Node 0 DMA per-cpu:
> [ 473.905237] CPU 0: hi: 0, btch: 1 usd: 0
> [ 473.905239] CPU 1: hi: 0, btch: 1 usd: 0
> [ 473.905241] CPU 2: hi: 0, btch: 1 usd: 0
> [ 473.905242] CPU 3: hi: 0, btch: 1 usd: 0
> [ 473.905243] Node 0 DMA32 per-cpu:
> [ 473.905246] CPU 0: hi: 186, btch: 31 usd: 31
> [ 473.905247] CPU 1: hi: 186, btch: 31 usd: 138
> [ 473.905249] CPU 2: hi: 186, btch: 31 usd: 163
> [ 473.905250] CPU 3: hi: 186, btch: 31 usd: 74
> [ 473.905251] Node 0 Normal per-cpu:
> [ 473.905253] CPU 0: hi: 186, btch: 31 usd: 56
> [ 473.905255] CPU 1: hi: 186, btch: 31 usd: 86
> [ 473.905256] CPU 2: hi: 186, btch: 31 usd: 130
> [ 473.905258] CPU 3: hi: 186, btch: 31 usd: 166
> [ 473.905262] active_anon:3554228 inactive_anon:426658 isolated_anon:0
> [ 473.905262] active_file:122 inactive_file:146 isolated_file:44
> [ 473.905262] unevictable:1218 dirty:0 writeback:0 unstable:0
> [ 473.905262] free:33361 slab_reclaimable:6684 slab_unreclaimable:7801
> [ 473.905262] mapped:10140 shmem:62 pagetables:22261 bounce:0
> [ 473.905262] free_cma:0
> [ 473.905266] Node 0 DMA free:15892kB 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:15984kB
> managed:15900kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB
> slab_reclaimable:0kB slab_unreclaimable:8kB kernel_stack:0kB pagetables:0kB
> unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0
> all_unreclaimable? yes
> [ 473.905272] lowmem_reserve[]: 0 3450 15976 15976
> [ 473.905276] Node 0 DMA32 free:64628kB min:14580kB low:18224kB high:21868kB
> active_anon:2849160kB inactive_anon:569760kB active_file:100kB
> inactive_file:96kB unevictable:712kB isolated(anon):0kB isolated(file):0kB
> present:3614516kB managed:3536136kB mlocked:712kB dirty:0kB writeback:0kB
> mapped:13204kB shmem:188kB slab_reclaimable:4680kB slab_unreclaimable:5432kB
> kernel_stack:872kB pagetables:18568kB unstable:0kB bounce:0kB free_cma:0kB
> writeback_tmp:0kB pages_scanned:110958 all_unreclaimable? yes
> [ 473.905282] lowmem_reserve[]: 0 0 12526 12526
> [ 473.905285] Node 0 Normal free:52924kB min:52936kB low:66168kB
> high:79404kB active_anon:11367752kB inactive_anon:1136872kB active_file:388kB
> inactive_file:488kB unevictable:4160kB isolated(anon):0kB
> isolated(file):176kB present:13090816kB managed:12827504kB mlocked:4160kB
> dirty:0kB writeback:0kB mapped:27356kB shmem:60kB slab_reclaimable:22056kB
> slab_unreclaimable:25764kB kernel_stack:2680kB pagetables:70476kB
> unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:3425
> all_unreclaimable? yes
> [ 473.905290] lowmem_reserve[]: 0 0 0 0
> [ 473.905294] Node 0 DMA: 1*4kB (U) 2*8kB (U) 2*16kB (U) 1*32kB (U) 1*64kB
> (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R) 3*4096kB (M) =
> 15892kB
> [ 473.905308] Node 0 DMA32: 129*4kB (UE) 66*8kB (UEM) 118*16kB (UE) 50*32kB
> (UEM) 21*64kB (UE) 9*128kB (UEM) 7*256kB (UEM) 1*512kB (E) 0*1024kB 1*2048kB
> (U) 13*4096kB (MR) = 64628kB
> [ 473.905322] Node 0 Normal: 739*4kB (UEM) 280*8kB (UE) 369*16kB (UEM)
> 164*32kB (UEM) 62*64kB (UEM) 22*128kB (UEM) 9*256kB (UEM) 4*512kB (E)
> 1*1024kB (U) 0*2048kB 6*4096kB (MR) = 53084kB
> [ 473.905337] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
> hugepages_size=2048kB
> [ 473.905339] 1647 total pagecache pages
> [ 473.905341] 380 pages in swap cache
> [ 473.905342] Swap cache stats: add 4234126, delete 4233746, find
> 256353/270546
> [ 473.905344] Free swap = 0kB
> [ 473.905345] Total swap = 16777212kB
> [ 473.905346] 4180329 pages RAM
> [ 473.905348] 0 pages HighMem/MovableOnly
> [ 473.905349] 65828 pages reserved
> [ 473.905350] 0 pages hwpoisoned
> [ 473.905351] [ pid ] uid tgid total_vm rss nr_ptes swapents
> oom_score_adj name
> [ 473.905358] [ 317] 0 317 4868 0 14 62 0
> upstart-udev-br
> [ 473.905361] [ 325] 0 325 13015 399 28 298
> -1000 systemd-udevd
> [ 473.905365] [ 609] 0 609 3814 0 12 55 0
> upstart-socket-
> [ 473.905370] [ 958] 0 958 67900 501 135 467
> 0 smbd
> [ 473.905372] [ 989] 0 989 3818 0 12 54 0
> upstart-file-br
> [ 473.905375] [ 1063] 101 1063 63959 333 26 151
> 0 rsyslogd
> [ 473.905378] [ 1071] 102 1071 10172 573 24 228
> 0 dbus-daemon
> [ 473.905380] [ 1086] 0 1086 82558 405 63 297
> 0 ModemManager
> [ 473.905383] [ 1090] 0 1090 4822 173 13 71 0
> bluetoothd
> [ 473.905385] [ 1098] 0 1098 67900 371 128 467
> 0 smbd
> [ 473.905387] [ 1121] 0 1121 10885 422 26 98 0
> systemd-logind
> [ 473.905390] [ 1129] 104 1129 8087 388 23 47 0
> avahi-daemon
> [ 473.905393] [ 1131] 104 1131 8055 0 20 63 0
> avahi-daemon
> [ 473.905395] [ 1138] 0 1138 85188 342 60 310
> 0 NetworkManager
> [ 473.905398] [ 1145] 0 1145 70408 842 40 253
> 0 polkitd
> [ 473.905400] [ 1221] 0 1221 2557 415 9 572
> 0 dhclient
> [ 473.905403] [ 1247] 0 1247 3954 384 13 41 0
> getty
> [ 473.905405] [ 1251] 0 1251 3954 390 13 41 0
> getty
> [ 473.905407] [ 1259] 0 1259 3954 399 13 40 0
> getty
> [ 473.905410] [ 1260] 0 1260 3954 396 12 40 0
> getty
> [ 473.905412] [ 1264] 0 1264 3954 396 13 41 0
> getty
> [ 473.905415] [ 1314] 0 1314 15340 414 33 168
> -1000 sshd
> [ 473.905417] [ 1315] 0 1315 4784 0 13 43 0
> atd
> [ 473.905419] [ 1323] 0 1323 5882 254 15 89 0
> vsftpd
> [ 473.905422] [ 1325] 0 1325 5913 425 17 42 0
> cron
> [ 473.905424] [ 1326] 0 1326 52742 438 40 177
> 0 gdm
> [ 473.905427] [ 1334] 0 1334 4796 372 14 28 0
> irqbalance
> [ 473.905429] [ 1351] 0 1351 18870 401 41 219
> 0 cups-browsed
> [ 473.905432] [ 1356] 0 1356 1091 357 8 49 0
> acpid
> [ 473.905434] [ 1433] 0 1433 73634 437 47 247
> 0 gdm-simple-slav
> [ 473.905437] [ 1506] 0 1506 51435 4774 91 3708
> 0 Xorg
> [ 473.905439] [ 1508] 0 1508 71869 353 43 249
> 0 accounts-daemon
> [ 473.905442] [ 1530] 65534 1530 7756 427 20 59 0
> dnsmasq
> [ 473.905444] [ 1641] 0 1641 57531 390 111 366
> 0 winbindd
> [ 473.905447] [ 1678] 122 1678 61926 469 57 342
> -900 postgres
> [ 473.905449] [ 1693] 0 1693 57531 354 111 378
> 0 winbindd
> [ 473.905451] [ 1703] 0 1703 47861 236 91 298
> 0 nmbd
> [ 473.905454] [ 1709] 122 1709 61926 41 48 349
> 0 postgres
> [ 473.905456] [ 1710] 122 1710 61926 213 49 346
> 0 postgres
> [ 473.905459] [ 1711] 122 1711 61926 166 47 349
> 0 postgres
> [ 473.905461] [ 1712] 122 1712 62141 240 52 496
> 0 postgres
> [ 473.905463] [ 1713] 122 1713 25845 240 45 355
> 0 postgres
> [ 473.905466] [ 1786] 0 1786 4271 1204 15 0 0
> atop
> [ 473.905468] [ 1790] 65534 1790 3741 357 13 44 0
> gdomap
> [ 473.905471] [ 1799] 108 1799 9285 322 19 83 0
> kerneloops
> [ 473.905473] [ 1819] 0 1819 107382 130 25 71 0
> osspd
> [ 473.905476] [ 1834] 0 1834 23862 379 17 104
> 0 pcscd
> [ 473.905479] [ 1937] 0 1937 23793 263 14 42 0
> apcupsd
> [ 473.905481] [ 2018] 0 2018 6671 1972 18 1378
> 0 preload
> [ 473.905483] [ 2052] 119 2052 28682 637 56 1209
> 0 timidity
> [ 473.905486] [ 2057] 0 2057 3954 393 13 41 0
> getty
> [ 473.905488] [ 2081] 0 2081 59850 93 46 196
> 0 upowerd
> [ 473.905491] [ 2129] 115 2129 75411 599 48 905
> 0 colord
> [ 473.905493] [ 2135] 110 2135 42228 399 19 71 0
> rtkit-daemon
> [ 473.905496] [ 2151] 130 2151 4260 295 14 44 0
> nvidia-persiste
> [ 473.905498] [ 2820] 113 2820 8891 297 22 128
> 0 ntpd
> [ 473.905501] [ 4846] 0 4846 19557 496 43 562
> 0 cupsd
> [ 473.905503] [ 4976] 0 4976 68341 459 67 268
> 0 gdm-session-wor
> [ 473.905506] [ 4996] 1000 4996 147088 328 47 837
> 0 gnome-keyring-d
> [ 473.905508] [ 4998] 1000 4998 8994 489 22 168
> 0 init
> [ 473.905511] [ 5078] 1000 5078 6142 261 16 79 0
> dbus-launch
> [ 473.905513] [ 5080] 1000 5080 9774 0 24 87 0
> dbus-daemon
> [ 473.905516] [ 5097] 1000 5097 2653 0 8 78 0
> ssh-agent
> [ 473.905518] [ 5107] 1000 5107 10286 359 24 465
> 0 dbus-daemon
> [ 473.905521] [ 5114] 1000 5114 60335 343 53 695
> 0 mediascanner-se
> [ 473.905523] [ 5117] 1000 5117 4525 200 13 36 0
> upstart-event-b
> [ 473.905525] [ 5123] 1000 5123 18500 0 32 141
> 0 window-stack-br
> [ 473.905528] [ 5129] 1000 5129 4527 172 12 63 0
> upstart-dbus-br
> [ 473.905530] [ 5133] 1000 5133 4527 180 12 40 0
> upstart-dbus-br
> [ 473.905533] [ 5135] 1000 5135 162161 537 108 1536
> 0 bamfdaemon
> [ 473.905535] [ 5137] 1000 5137 89407 555 41 165
> 0 ibus-daemon
> [ 473.905538] [ 5148] 1000 5148 84480 362 32 671
> 0 at-spi-bus-laun
> [ 473.905540] [ 5152] 1000 5152 9807 408 24 97 0
> dbus-daemon
> [ 473.905543] [ 5155] 1000 5155 31253 294 30 113
> 0 at-spi2-registr
> [ 473.905545] [ 5159] 1000 5159 48110 370 29 163
> 0 gvfsd
> [ 473.905548] [ 5165] 1000 5165 69230 377 37 189
> 0 ibus-dconf
> [ 473.905550] [ 5166] 1000 5166 144909 525 109 1916
> 0 ibus-ui-gtk3
> [ 473.905553] [ 5168] 1000 5168 96227 397 87 487
> 0 ibus-x11
> [ 473.905555] [ 5184] 1000 5184 86415 350 38 199
> 0 gvfsd-fuse
> [ 473.905557] [ 5196] 1000 5196 6646 186 17 70 0
> upstart-file-br
> [ 473.905560] [ 5798] 1000 5798 210028 890 175 2053
> 0 gnome-settings-
> [ 473.905562] [ 5827] 1000 5827 143845 522 111 1264
> 0 gnome-session
> [ 473.905565] [ 7788] 1000 7788 112673 517 90 812
> 0 pulseaudio
> [ 473.905567] [ 7813] 1000 7813 24597 59 50 180
> 0 gconf-helper
> [ 473.905570] [ 7815] 1000 7815 13523 460 32 400
> 0 gconfd-2
> [ 473.905572] [ 7817] 1000 7817 96739 400 84 344
> 0 gsd-printer
> [ 473.905575] [ 7819] 1000 7819 45501 406 25 1101
> 0 dconf-service
> [ 473.905577] [ 7825] 1000 7825 50238 388 35 151
> 0 ibus-engine-sim
> [ 473.905580] [ 7855] 1000 7855 436938 9733 319 25236
> 0 gnome-shell
> [ 473.905583] [ 7871] 1000 7871 123350 447 70 1220
> 0 gnome-shell-cal
> [ 473.905585] [ 7877] 1000 7877 160284 528 137 759
> 0 evolution-sourc
> [ 473.905588] [ 7883] 1000 7883 100333 472 65 445
> 0 mission-control
> [ 473.905590] [ 7887] 1000 7887 166665 0 156 4417
> 0 goa-daemon
> [ 473.905592] [ 7895] 1000 7895 145369 369 54 632
> 0 gvfs-udisks2-vo
> [ 473.905595] [ 7898] 0 7898 92939 402 48 1074
> 0 udisksd
> [ 473.905597] [ 7923] 1000 7923 49019 227 32 197
> 0 gvfs-mtp-volume
> [ 473.905600] [ 7927] 1000 7927 45864 307 25 170
> 0 gvfs-goa-volume
> [ 473.905602] [ 7931] 1000 7931 70440 332 39 209
> 0 gvfs-afc-volume
> [ 473.905605] [ 7936] 1000 7936 52060 443 37 210
> 0 gvfs-gphoto2-vo
> [ 473.905607] [ 7943] 1000 7943 30156 414 29 186
> 0 gvfsd-metadata
> [ 473.905610] [ 7947] 1000 7947 366257 562 210 3228
> 0 nautilus
> [ 473.905612] [ 7963] 1000 7963 68650 352 35 180
> 0 indicator-power
> [ 473.905615] [ 7965] 1000 7965 195421 626 128 2368
> 0 nm-applet
> [ 473.905617] [ 7967] 1000 7967 64915 408 27 148
> 0 indicator-bluet
> [ 473.905620] [ 7971] 1000 7971 119599 366 68 3242
> 0 tracker-miner-f
> [ 473.905622] [ 7990] 1000 7990 228654 357 171 10717
> 0 evolution-calen
> [ 473.905625] [ 7992] 1000 7992 118206 507 129 3519
> 0 guake
> [ 473.905627] [ 7994] 1000 7994 98425 399 55 2468
> 0 tracker-store
> [ 473.905629] [ 8020] 1000 8020 73119 370 41 261
> 0 telepathy-logge
> [ 473.905632] [ 8099] 1000 8099 66544 207 31 165
> 0 gvfsd-burn
> [ 473.905634] [ 8105] 1000 8105 107236 401 43 235
> 0 gvfsd-trash
> [ 473.905637] [ 8164] 1000 8164 3705 378 13 39 0
> gnome-pty-helpe
> [ 473.905639] [ 8165] 1000 8165 6502 461 17 1350
> 0 bash
> [ 473.905642] [10468] 1000 10468 185692 1047 133 1947
> 0 gnome-terminal-
> [ 473.905644] [10476] 1000 10476 3705 364 13 40 0
> gnome-pty-helpe
> [ 473.905647] [10477] 1000 10477 6502 439 17 1349
> 0 bash
> [ 473.905649] [10557] 1000 10557 102685 785 86 620
> 0 zeitgeist-datah
> [ 473.905652] [10562] 1000 10562 87219 523 40 159
> 0 zeitgeist-daemo
> [ 473.905654] [10568] 1000 10568 81497 446 55 644
> 0 zeitgeist-fts
> [ 473.905657] [10574] 1000 10574 1803 57 9 24 0
> cat
> [ 473.905659] [10588] 1000 10588 93847 462 50 372
> 0 gvfsd-http
> [ 473.905662] [10600] 1000 10600 198286 459 217 5341
> 0 evolution-alarm
> [ 473.905664] [10619] 1000 10619 137054 504 124 8342
> 0 ubuntuone-syncd
> [ 473.905666] [12873] 1000 12873 6502 440 18 1349
> 0 bash
> [ 473.905669] [12953] 1000 12953 6503 449 18 1350
> 0 bash
> [ 473.905671] [13033] 1000 13033 6504 560 18 1264
> 0 bash
> [ 473.905674] [13113] 1000 13113 6505 484 18 1355
> 0 bash
> [ 473.905676] [13193] 1000 13193 6504 492 17 1343
> 0 bash
> [ 473.905678] [13285] 1000 13285 164668 496 114 2170
> 0 update-notifier
> [ 473.905681] [17869] 1000 17869 93505 408 49 303
> 0 deja-dup-monito
> [ 473.905684] [31463] 1000 31463 8041866 3969604 15713 4069471
> 0 alloc
> [ 473.905686] Out of memory: Kill process 31463 (alloc) score 971 or
> sacrifice child
> [ 473.905688] Killed process 31463 (alloc) total-vm:32167464kB,
> anon-rss:15876888kB, file-rss:1528kB
>
> Hope someone can resolve issue.

And I'll assume that the OOM-kill above is working as intended:
that's what you were trying to trigger with your test program.

Hugh
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