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SubjectRe: [PATCH 1/2] Revert "vmalloc: back off when the current task is killed"
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Date
On 2017/10/05 19:36, Tetsuo Handa wrote:
> I don't want this patch backported. If you want to backport,
> "s/fatal_signal_pending/tsk_is_oom_victim/" is the safer way.

If you backport this patch, you will see "complete depletion of memory reserves"
and "extra OOM kills due to depletion of memory reserves" using below reproducer.

----------
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/oom.h>

static char *buffer;

static int __init test_init(void)
{
set_current_oom_origin();
buffer = vmalloc((1UL << 32) - 480 * 1048576);
clear_current_oom_origin();
return buffer ? 0 : -ENOMEM;
}

static void test_exit(void)
{
vfree(buffer);
}

module_init(test_init);
module_exit(test_exit);
MODULE_LICENSE("GPL");
----------

----------
CentOS Linux 7 (Core)
Kernel 4.13.5+ on an x86_64

ccsecurity login: [ 53.637666] test: loading out-of-tree module taints kernel.
[ 53.856166] insmod invoked oom-killer: gfp_mask=0x14002c2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN), nodemask=(null), order=0, oom_score_adj=0
[ 53.858754] insmod cpuset=/ mems_allowed=0
[ 53.859713] CPU: 1 PID: 2763 Comm: insmod Tainted: G O 4.13.5+ #10
[ 53.861134] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[ 53.863072] Call Trace:
[ 53.863548] dump_stack+0x4d/0x6f
[ 53.864172] dump_header+0x92/0x22a
[ 53.864869] ? has_ns_capability_noaudit+0x30/0x40
[ 53.865887] oom_kill_process+0x250/0x440
[ 53.866644] out_of_memory+0x10d/0x480
[ 53.867343] __alloc_pages_nodemask+0x1087/0x1140
[ 53.868216] alloc_pages_current+0x65/0xd0
[ 53.869086] __vmalloc_node_range+0x129/0x230
[ 53.869895] vmalloc+0x39/0x40
[ 53.870472] ? test_init+0x26/0x1000 [test]
[ 53.871248] test_init+0x26/0x1000 [test]
[ 53.871993] ? 0xffffffffa00fa000
[ 53.872609] do_one_initcall+0x4d/0x190
[ 53.873301] do_init_module+0x5a/0x1f7
[ 53.873999] load_module+0x2022/0x2960
[ 53.874678] ? vfs_read+0x116/0x130
[ 53.875312] SyS_finit_module+0xe1/0xf0
[ 53.876074] ? SyS_finit_module+0xe1/0xf0
[ 53.876806] do_syscall_64+0x5c/0x140
[ 53.877488] entry_SYSCALL64_slow_path+0x25/0x25
[ 53.878316] RIP: 0033:0x7f1b27c877f9
[ 53.878964] RSP: 002b:00007ffff552e718 EFLAGS: 00000206 ORIG_RAX: 0000000000000139
[ 53.880620] RAX: ffffffffffffffda RBX: 0000000000a2d210 RCX: 00007f1b27c877f9
[ 53.881883] RDX: 0000000000000000 RSI: 000000000041a678 RDI: 0000000000000003
[ 53.883167] RBP: 000000000041a678 R08: 0000000000000000 R09: 00007ffff552e8b8
[ 53.884685] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000000000
[ 53.885949] R13: 0000000000a2d1e0 R14: 0000000000000000 R15: 0000000000000000
[ 53.887392] Mem-Info:
[ 53.887909] active_anon:14248 inactive_anon:2088 isolated_anon:0
[ 53.887909] active_file:4 inactive_file:2 isolated_file:2
[ 53.887909] unevictable:0 dirty:3 writeback:2 unstable:0
[ 53.887909] slab_reclaimable:2818 slab_unreclaimable:4420
[ 53.887909] mapped:453 shmem:2162 pagetables:1676 bounce:0
[ 53.887909] free:21418 free_pcp:0 free_cma:0
[ 53.895172] Node 0 active_anon:56992kB inactive_anon:8352kB active_file:12kB inactive_file:12kB unevictable:0kB isolated(anon):0kB isolated(file):8kB mapped:1812kB dirty:12kB writeback:8kB shmem:8648kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 6144kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
[ 53.901844] Node 0 DMA free:14932kB min:284kB low:352kB high:420kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 53.907765] lowmem_reserve[]: 0 2703 3662 3662
[ 53.909333] Node 0 DMA32 free:53424kB min:49684kB low:62104kB high:74524kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129216kB managed:2790292kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 53.915597] lowmem_reserve[]: 0 0 958 958
[ 53.916992] Node 0 Normal free:17192kB min:17608kB low:22008kB high:26408kB active_anon:56992kB inactive_anon:8352kB active_file:12kB inactive_file:12kB unevictable:0kB writepending:20kB present:1048576kB managed:981384kB mlocked:0kB kernel_stack:3648kB pagetables:6704kB bounce:0kB free_pcp:112kB local_pcp:0kB free_cma:0kB
[ 53.924610] lowmem_reserve[]: 0 0 0 0
[ 53.926131] Node 0 DMA: 1*4kB (U) 0*8kB 1*16kB (U) 0*32kB 1*64kB (U) 0*128kB 0*256kB 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 14932kB
[ 53.929273] Node 0 DMA32: 4*4kB (UM) 2*8kB (UM) 5*16kB (UM) 4*32kB (M) 3*64kB (M) 4*128kB (M) 5*256kB (UM) 4*512kB (M) 4*1024kB (UM) 2*2048kB (UM) 10*4096kB (M) = 53424kB
[ 53.934010] Node 0 Normal: 896*4kB (ME) 466*8kB (UME) 288*16kB (UME) 128*32kB (UME) 23*64kB (UM) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 17488kB
[ 53.937833] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[ 53.940769] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[ 53.943250] 2166 total pagecache pages
[ 53.944788] 0 pages in swap cache
[ 53.946249] Swap cache stats: add 0, delete 0, find 0/0
[ 53.948075] Free swap = 0kB
[ 53.949419] Total swap = 0kB
[ 53.950873] 1048445 pages RAM
[ 53.952238] 0 pages HighMem/MovableOnly
[ 53.953768] 101550 pages reserved
[ 53.955555] 0 pages hwpoisoned
[ 53.956923] Out of memory: Kill process 2763 (insmod) score 3621739297 or sacrifice child
[ 53.959298] Killed process 2763 (insmod) total-vm:13084kB, anon-rss:132kB, file-rss:0kB, shmem-rss:0kB
[ 53.962059] oom_reaper: reaped process 2763 (insmod), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
[ 53.968054] insmod invoked oom-killer: gfp_mask=0x14002c2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN), nodemask=(null), order=0, oom_score_adj=0
[ 53.971406] insmod cpuset=/ mems_allowed=0
[ 53.973066] CPU: 1 PID: 2763 Comm: insmod Tainted: G O 4.13.5+ #10
[ 53.975339] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[ 53.978388] Call Trace:
[ 53.979714] dump_stack+0x4d/0x6f
[ 53.981176] dump_header+0x92/0x22a
[ 53.982747] ? has_ns_capability_noaudit+0x30/0x40
[ 53.984481] oom_kill_process+0x250/0x440
[ 53.986133] out_of_memory+0x10d/0x480
[ 53.987667] __alloc_pages_nodemask+0x1087/0x1140
[ 53.989431] alloc_pages_current+0x65/0xd0
[ 53.991037] __vmalloc_node_range+0x129/0x230
[ 53.992775] vmalloc+0x39/0x40
[ 53.994421] ? test_init+0x26/0x1000 [test]
[ 53.996063] test_init+0x26/0x1000 [test]
[ 53.997825] ? 0xffffffffa00fa000
[ 53.999280] do_one_initcall+0x4d/0x190
[ 54.000786] do_init_module+0x5a/0x1f7
[ 54.002351] load_module+0x2022/0x2960
[ 54.003789] ? vfs_read+0x116/0x130
[ 54.005299] SyS_finit_module+0xe1/0xf0
[ 54.006872] ? SyS_finit_module+0xe1/0xf0
[ 54.008300] do_syscall_64+0x5c/0x140
[ 54.009912] entry_SYSCALL64_slow_path+0x25/0x25
[ 54.011464] RIP: 0033:0x7f1b27c877f9
[ 54.012816] RSP: 002b:00007ffff552e718 EFLAGS: 00000206 ORIG_RAX: 0000000000000139
[ 54.014958] RAX: ffffffffffffffda RBX: 0000000000a2d210 RCX: 00007f1b27c877f9
[ 54.017062] RDX: 0000000000000000 RSI: 000000000041a678 RDI: 0000000000000003
[ 54.019065] RBP: 000000000041a678 R08: 0000000000000000 R09: 00007ffff552e8b8
[ 54.020951] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000000000
[ 54.022738] R13: 0000000000a2d1e0 R14: 0000000000000000 R15: 0000000000000000
[ 54.024673] Mem-Info:
[ 54.025767] active_anon:14220 inactive_anon:2088 isolated_anon:0
[ 54.025767] active_file:3 inactive_file:0 isolated_file:0
[ 54.025767] unevictable:0 dirty:1 writeback:2 unstable:0
[ 54.025767] slab_reclaimable:2774 slab_unreclaimable:4420
[ 54.025767] mapped:453 shmem:2162 pagetables:1676 bounce:0
[ 54.025767] free:72 free_pcp:0 free_cma:0
[ 54.034925] Node 0 active_anon:56880kB inactive_anon:8352kB active_file:12kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:1812kB dirty:4kB writeback:8kB shmem:8648kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 6144kB writeback_tmp:0kB unstable:0kB all_unreclaimable? yes
[ 54.041176] Node 0 DMA free:12kB min:284kB low:352kB high:420kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.047349] lowmem_reserve[]: 0 2703 3662 3662
[ 54.048922] Node 0 DMA32 free:104kB min:49684kB low:62104kB high:74524kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129216kB managed:2790292kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.055698] lowmem_reserve[]: 0 0 958 958
[ 54.057182] Node 0 Normal free:188kB min:17608kB low:22008kB high:26408kB active_anon:56880kB inactive_anon:8352kB active_file:12kB inactive_file:0kB unevictable:0kB writepending:12kB present:1048576kB managed:981384kB mlocked:0kB kernel_stack:3648kB pagetables:6704kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.065665] lowmem_reserve[]: 0 0 0 0
[ 54.067279] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[ 54.069949] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[ 54.072630] Node 0 Normal: 31*4kB (UM) 5*8kB (UM) 1*16kB (E) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 180kB
[ 54.075624] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[ 54.078142] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[ 54.080509] 2165 total pagecache pages
[ 54.081931] 0 pages in swap cache
[ 54.083381] Swap cache stats: add 0, delete 0, find 0/0
[ 54.085051] Free swap = 0kB
[ 54.086305] Total swap = 0kB
[ 54.087931] 1048445 pages RAM
[ 54.089296] 0 pages HighMem/MovableOnly
[ 54.090731] 101550 pages reserved
[ 54.092161] 0 pages hwpoisoned
[ 54.093738] Out of memory: Kill process 2458 (tuned) score 3 or sacrifice child
[ 54.095910] Killed process 2458 (tuned) total-vm:562424kB, anon-rss:12764kB, file-rss:0kB, shmem-rss:0kB
[ 54.098531] insmod: vmalloc: allocation failure, allocated 3725393920 of 3791654912 bytes, mode:0x14000c0(GFP_KERNEL), nodemask=(null)
[ 54.101771] insmod cpuset=/ mems_allowed=0
[ 54.103661] oom_reaper: reaped process 2458 (tuned), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
[ 54.103807] tuned invoked oom-killer: gfp_mask=0x17080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOTRACK), nodemask=(null), order=0, oom_score_adj=0
[ 54.103809] tuned cpuset=/ mems_allowed=0
[ 54.103815] CPU: 2 PID: 2712 Comm: tuned Tainted: G O 4.13.5+ #10
[ 54.103815] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[ 54.103816] Call Trace:
[ 54.103825] dump_stack+0x4d/0x6f
[ 54.103827] dump_header+0x92/0x22a
[ 54.103830] ? has_ns_capability_noaudit+0x30/0x40
[ 54.103834] oom_kill_process+0x250/0x440
[ 54.103835] out_of_memory+0x10d/0x480
[ 54.103836] __alloc_pages_nodemask+0x1087/0x1140
[ 54.103840] alloc_pages_current+0x65/0xd0
[ 54.103843] pte_alloc_one+0x12/0x40
[ 54.103845] do_huge_pmd_anonymous_page+0xfd/0x620
[ 54.103847] __handle_mm_fault+0x9a7/0x1040
[ 54.103848] ? _lookup_address_cpa.isra.7+0x38/0x40
[ 54.103849] handle_mm_fault+0xd1/0x1c0
[ 54.103852] __do_page_fault+0x28b/0x4f0
[ 54.103854] do_page_fault+0x20/0x70
[ 54.103857] page_fault+0x22/0x30
[ 54.103859] RIP: 0010:__get_user_8+0x1b/0x25
[ 54.103860] RSP: 0000:ffffc90002703c38 EFLAGS: 00010287
[ 54.103860] RAX: 00007fc407fff9e7 RBX: ffff880136cbc740 RCX: 00000000000002b0
[ 54.103861] RDX: ffff880133c98e00 RSI: ffff880136cbc740 RDI: ffff880133c98e00
[ 54.103861] RBP: ffffc90002703c80 R08: 0000000000000001 R09: 0000000000000000
[ 54.103862] R10: ffffc90002703c48 R11: 00000000000003f6 R12: ffff880133c98e00
[ 54.103862] R13: ffff880133c98e00 R14: 00007fc407fff9e0 R15: 0000000001399fc8
[ 54.103866] ? exit_robust_list+0x2e/0x110
[ 54.103868] mm_release+0x100/0x140
[ 54.103869] do_exit+0x14b/0xb50
[ 54.103871] ? pick_next_task_fair+0x17d/0x4d0
[ 54.103874] ? put_prev_entity+0x26/0x340
[ 54.103875] do_group_exit+0x36/0xb0
[ 54.103878] get_signal+0x263/0x5f0
[ 54.103881] do_signal+0x32/0x630
[ 54.103884] ? __audit_syscall_exit+0x21a/0x2b0
[ 54.103886] ? syscall_slow_exit_work+0x15c/0x1a0
[ 54.103888] ? getnstimeofday64+0x9/0x20
[ 54.103890] ? wake_up_q+0x80/0x80
[ 54.103891] exit_to_usermode_loop+0x76/0x90
[ 54.103892] do_syscall_64+0x12e/0x140
[ 54.103893] entry_SYSCALL64_slow_path+0x25/0x25
[ 54.103895] RIP: 0033:0x7fc42486e923
[ 54.103895] RSP: 002b:00007fc407ffe360 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8
[ 54.103896] RAX: fffffffffffffffc RBX: 00007fc4259b7828 RCX: 00007fc42486e923
[ 54.103896] RDX: 00000000000003ff RSI: 00007fc400001980 RDI: 000000000000000a
[ 54.103897] RBP: 00000000ffffffff R08: 00007fc41a1558e0 R09: 0000000000002ff4
[ 54.103897] R10: 00000000ffffffff R11: 0000000000000293 R12: 00007fc40c010140
[ 54.103898] R13: 00007fc400001980 R14: 00007fc400001790 R15: 0000000001399fc8
[ 54.103899] Mem-Info:
[ 54.103902] active_anon:11004 inactive_anon:2088 isolated_anon:0
[ 54.103902] active_file:6 inactive_file:0 isolated_file:0
[ 54.103902] unevictable:0 dirty:1 writeback:2 unstable:0
[ 54.103902] slab_reclaimable:2770 slab_unreclaimable:4420
[ 54.103902] mapped:453 shmem:2162 pagetables:1676 bounce:0
[ 54.103902] free:3117 free_pcp:158 free_cma:0
[ 54.103904] Node 0 active_anon:44016kB inactive_anon:8352kB active_file:24kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:1812kB dirty:4kB writeback:8kB shmem:8648kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 6144kB writeback_tmp:0kB unstable:0kB all_unreclaimable? yes
[ 54.103905] Node 0 DMA free:12kB min:284kB low:352kB high:420kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.103908] lowmem_reserve[]: 0 2703 3662 3662
[ 54.103909] Node 0 DMA32 free:104kB min:49684kB low:62104kB high:74524kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129216kB managed:2790292kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.103911] lowmem_reserve[]: 0 0 958 958
[ 54.103912] Node 0 Normal free:12352kB min:17608kB low:22008kB high:26408kB active_anon:44068kB inactive_anon:8352kB active_file:24kB inactive_file:0kB unevictable:0kB writepending:12kB present:1048576kB managed:981384kB mlocked:0kB kernel_stack:3616kB pagetables:6704kB bounce:0kB free_pcp:632kB local_pcp:632kB free_cma:0kB
[ 54.103914] lowmem_reserve[]: 0 0 0 0
[ 54.103915] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[ 54.103918] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[ 54.103921] Node 0 Normal: 536*4kB (UM) 281*8kB (UM) 124*16kB (UME) 76*32kB (UM) 12*64kB (U) 3*128kB (U) 2*256kB (U) 0*512kB 0*1024kB 1*2048kB (M) 0*4096kB = 12520kB
[ 54.103926] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[ 54.103926] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[ 54.103927] 2165 total pagecache pages
[ 54.103928] 0 pages in swap cache
[ 54.103929] Swap cache stats: add 0, delete 0, find 0/0
[ 54.103929] Free swap = 0kB
[ 54.103929] Total swap = 0kB
[ 54.103929] 1048445 pages RAM
[ 54.103930] 0 pages HighMem/MovableOnly
[ 54.103930] 101550 pages reserved
[ 54.103930] 0 pages hwpoisoned
[ 54.103931] Out of memory: Kill process 2353 (dhclient) score 3 or sacrifice child
[ 54.103984] Killed process 2353 (dhclient) total-vm:113384kB, anon-rss:12488kB, file-rss:0kB, shmem-rss:0kB
[ 54.262237] CPU: 1 PID: 2763 Comm: insmod Tainted: G O 4.13.5+ #10
[ 54.264476] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[ 54.267326] Call Trace:
[ 54.268614] dump_stack+0x4d/0x6f
[ 54.270200] warn_alloc+0x10f/0x1a0
[ 54.271723] __vmalloc_node_range+0x14e/0x230
[ 54.273359] vmalloc+0x39/0x40
[ 54.274778] ? test_init+0x26/0x1000 [test]
[ 54.276480] test_init+0x26/0x1000 [test]
[ 54.278081] ? 0xffffffffa00fa000
[ 54.279576] do_one_initcall+0x4d/0x190
[ 54.281089] do_init_module+0x5a/0x1f7
[ 54.282637] load_module+0x2022/0x2960
[ 54.284221] ? vfs_read+0x116/0x130
[ 54.285674] SyS_finit_module+0xe1/0xf0
[ 54.287216] ? SyS_finit_module+0xe1/0xf0
[ 54.288737] do_syscall_64+0x5c/0x140
[ 54.290285] entry_SYSCALL64_slow_path+0x25/0x25
[ 54.291930] RIP: 0033:0x7f1b27c877f9
[ 54.293557] RSP: 002b:00007ffff552e718 EFLAGS: 00000206 ORIG_RAX: 0000000000000139
[ 54.295810] RAX: ffffffffffffffda RBX: 0000000000a2d210 RCX: 00007f1b27c877f9
[ 54.297875] RDX: 0000000000000000 RSI: 000000000041a678 RDI: 0000000000000003
[ 54.299904] RBP: 000000000041a678 R08: 0000000000000000 R09: 00007ffff552e8b8
[ 54.301935] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000000000
[ 54.303884] R13: 0000000000a2d1e0 R14: 0000000000000000 R15: 0000000000000000
[ 54.305896] Mem-Info:
[ 54.307238] active_anon:7863 inactive_anon:2088 isolated_anon:0
[ 54.307238] active_file:3 inactive_file:431 isolated_file:0
[ 54.307238] unevictable:0 dirty:1 writeback:2 unstable:0
[ 54.307238] slab_reclaimable:2767 slab_unreclaimable:4413
[ 54.307238] mapped:660 shmem:2162 pagetables:1529 bounce:0
[ 54.307238] free:5315 free_pcp:291 free_cma:0
[ 54.317589] Node 0 active_anon:31452kB inactive_anon:8352kB active_file:12kB inactive_file:1836kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:2700kB dirty:4kB writeback:8kB shmem:8648kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 4096kB writeback_tmp:0kB unstable:0kB all_unreclaimable? yes
[ 54.324325] Node 0 DMA free:12kB min:284kB low:352kB high:420kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.330628] lowmem_reserve[]: 0 2703 3662 3662
[ 54.332163] Node 0 DMA32 free:104kB min:49684kB low:62104kB high:74524kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129216kB managed:2790292kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 54.338996] lowmem_reserve[]: 0 0 958 958
[ 54.340615] Node 0 Normal free:20648kB min:17608kB low:22008kB high:26408kB active_anon:31452kB inactive_anon:8352kB active_file:12kB inactive_file:2360kB unevictable:0kB writepending:12kB present:1048576kB managed:981384kB mlocked:0kB kernel_stack:3584kB pagetables:6116kB bounce:0kB free_pcp:1192kB local_pcp:8kB free_cma:0kB
[ 54.348671] lowmem_reserve[]: 0 0 0 0
[ 54.350205] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[ 54.353027] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[ 54.355895] Node 0 Normal: 580*4kB (UE) 329*8kB (U) 129*16kB (UE) 70*32kB (U) 16*64kB (U) 5*128kB (UM) 5*256kB (UM) 2*512kB (M) 1*1024kB (M) 3*2048kB (M) 0*4096kB = 20392kB
[ 54.360581] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[ 54.363080] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[ 54.365507] 2864 total pagecache pages
[ 54.366963] 0 pages in swap cache
[ 54.368390] Swap cache stats: add 0, delete 0, find 0/0
[ 54.370124] Free swap = 0kB
[ 54.371431] Total swap = 0kB
[ 54.372770] 1048445 pages RAM
[ 54.374085] 0 pages HighMem/MovableOnly
[ 54.376827] 101550 pages reserved
[ 54.378635] 0 pages hwpoisoned
----------

On the other hand, if you do "s/fatal_signal_pending/tsk_is_oom_victim/", there
is no "depletion of memory reseres" and no "extra OOM kills due to depletion of
memory reserves".

----------
CentOS Linux 7 (Core)
Kernel 4.13.5+ on an x86_64

ccsecurity login: [ 54.746704] test: loading out-of-tree module taints kernel.
[ 54.896608] insmod invoked oom-killer: gfp_mask=0x14002c2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN), nodemask=(null), order=0, oom_score_adj=0
[ 54.900107] insmod cpuset=/ mems_allowed=0
[ 54.902235] CPU: 3 PID: 2749 Comm: insmod Tainted: G O 4.13.5+ #11
[ 54.906886] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[ 54.909943] Call Trace:
[ 54.911433] dump_stack+0x4d/0x6f
[ 54.912957] dump_header+0x92/0x22a
[ 54.914426] ? has_ns_capability_noaudit+0x30/0x40
[ 54.916242] oom_kill_process+0x250/0x440
[ 54.917912] out_of_memory+0x10d/0x480
[ 54.919426] __alloc_pages_nodemask+0x1087/0x1140
[ 54.921365] ? vmap_page_range_noflush+0x280/0x320
[ 54.923232] alloc_pages_current+0x65/0xd0
[ 54.924784] __vmalloc_node_range+0x16a/0x280
[ 54.926386] vmalloc+0x39/0x40
[ 54.927686] ? test_init+0x26/0x1000 [test]
[ 54.929258] test_init+0x26/0x1000 [test]
[ 54.930793] ? 0xffffffffa00a0000
[ 54.932167] do_one_initcall+0x4d/0x190
[ 54.933586] ? kfree+0x16f/0x180
[ 54.934992] ? kfree+0x16f/0x180
[ 54.936393] do_init_module+0x5a/0x1f7
[ 54.937807] load_module+0x2022/0x2960
[ 54.939344] ? vfs_read+0x116/0x130
[ 54.940901] SyS_finit_module+0xe1/0xf0
[ 54.942386] ? SyS_finit_module+0xe1/0xf0
[ 54.943955] do_syscall_64+0x5c/0x140
[ 54.945991] entry_SYSCALL64_slow_path+0x25/0x25
[ 54.947802] RIP: 0033:0x7fd1655057f9
[ 54.949220] RSP: 002b:00007fff9d59fdf8 EFLAGS: 00000202 ORIG_RAX: 0000000000000139
[ 54.951317] RAX: ffffffffffffffda RBX: 000000000085e210 RCX: 00007fd1655057f9
[ 54.953379] RDX: 0000000000000000 RSI: 000000000041a678 RDI: 0000000000000003
[ 54.955837] RBP: 000000000041a678 R08: 0000000000000000 R09: 00007fff9d59ff98
[ 54.959966] R10: 0000000000000003 R11: 0000000000000202 R12: 0000000000000000
[ 54.962171] R13: 000000000085e1e0 R14: 0000000000000000 R15: 0000000000000000
[ 54.978917] Mem-Info:
[ 54.980118] active_anon:13936 inactive_anon:2088 isolated_anon:0
[ 54.980118] active_file:32 inactive_file:6 isolated_file:0
[ 54.980118] unevictable:0 dirty:10 writeback:0 unstable:0
[ 54.980118] slab_reclaimable:2812 slab_unreclaimable:4414
[ 54.980118] mapped:456 shmem:2162 pagetables:1681 bounce:0
[ 54.980118] free:21335 free_pcp:0 free_cma:0
[ 54.990120] Node 0 active_anon:55744kB inactive_anon:8352kB active_file:128kB inactive_file:24kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:1824kB dirty:40kB writeback:0kB shmem:8648kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 10240kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
[ 54.996847] Node 0 DMA free:14932kB min:284kB low:352kB high:420kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 55.003426] lowmem_reserve[]: 0 2703 3662 3662
[ 55.004962] Node 0 DMA32 free:53056kB min:49684kB low:62104kB high:74524kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129216kB managed:2790292kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 55.011598] lowmem_reserve[]: 0 0 958 958
[ 55.013852] Node 0 Normal free:17352kB min:17608kB low:22008kB high:26408kB active_anon:55696kB inactive_anon:8352kB active_file:364kB inactive_file:180kB unevictable:0kB writepending:36kB present:1048576kB managed:981384kB mlocked:0kB kernel_stack:3600kB pagetables:6724kB bounce:0kB free_pcp:120kB local_pcp:120kB free_cma:0kB
[ 55.021929] lowmem_reserve[]: 0 0 0 0
[ 55.023636] Node 0 DMA: 1*4kB (U) 0*8kB 1*16kB (U) 0*32kB 1*64kB (U) 0*128kB 0*256kB 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 14932kB
[ 55.026942] Node 0 DMA32: 4*4kB (UM) 2*8kB (UM) 5*16kB (UM) 4*32kB (M) 3*64kB (M) 5*128kB (UM) 4*256kB (M) 4*512kB (M) 4*1024kB (UM) 2*2048kB (UM) 10*4096kB (M) = 53296kB
[ 55.031534] Node 0 Normal: 974*4kB (UME) 560*8kB (UME) 288*16kB (ME) 96*32kB (ME) 24*64kB (UM) 0*128kB 1*256kB (U) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 17848kB
[ 55.036126] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[ 55.038841] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[ 55.041431] 2197 total pagecache pages
[ 55.043071] 0 pages in swap cache
[ 55.044597] Swap cache stats: add 0, delete 0, find 0/0
[ 55.046509] Free swap = 0kB
[ 55.047977] Total swap = 0kB
[ 55.049548] 1048445 pages RAM
[ 55.051143] 0 pages HighMem/MovableOnly
[ 55.052799] 101550 pages reserved
[ 55.054319] 0 pages hwpoisoned
[ 55.055906] Out of memory: Kill process 2749 (insmod) score 3621739297 or sacrifice child
[ 55.058429] Killed process 2749 (insmod) total-vm:13084kB, anon-rss:132kB, file-rss:0kB, shmem-rss:0kB
[ 55.061278] oom_reaper: reaped process 2749 (insmod), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
----------

Therfore, I throw

Nacked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

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