oom-killer

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Hello,

Below are the logs from oom-kller. I am not able to interpret/decode the logs as well as not able to find root cause of oom-killer.

Note: CPU Arch: Arm 32-bit , Kernel - 4.14.65

[  727.941258] kworker/u8:2 invoked oom-killer: gfp_mask=0x15080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), nodemask=(null),  order=1, oom_score_adj=0
[  727.954355] CPU: 0 PID: 56 Comm: kworker/u8:2 Tainted: P           O    4.14.65 #606
[  727.962450] Hardware name: Android (Flattened Device Tree)
[  727.968812] Workqueue: events_unbound call_usermodehelper_exec_work
[  727.975076] Backtrace:
[  727.977528] [<c020dbec>] (dump_backtrace) from [<c020ded4>] (show_stack+0x18/0x1c)
[  727.985096]  r6:600f0113 r5:c141c0dc r4:00000000 r3:cf08b34d
[  727.990755] [<c020debc>] (show_stack) from [<c0ba8cf0>] (dump_stack+0x94/0xa8)
[  727.997979] [<c0ba8c5c>] (dump_stack) from [<c034b284>] (dump_header+0xa0/0x20c)
[  728.005372]  r6:dd347d7c r5:dd347d7c r4:d5737080 r3:cf08b34d
[  728.011030] [<c034b1e4>] (dump_header) from [<c034a4b8>] (oom_kill_process+0x424/0x534)
[  728.019033]  r10:00000001 r9:c12169bc r8:00000392 r7:c0e08d5c r6:dd347d7c r5:d5737080
[  728.026856]  r4:d57375f8
[  728.029390] [<c034a094>] (oom_kill_process) from [<c034af24>] (out_of_memory+0x140/0x368)
[  728.037569]  r10:00000001 r9:c12169bc r8:00000041 r7:c121e680 r6:c1216588 r5:dd347d7c
[  728.045392]  r4:d5737080
[  728.047929] [<c034ade4>] (out_of_memory) from [<c03519ac>] (__alloc_pages_nodemask+0x1178/0x124c)
[  728.056798]  r7:c141e7d0 r6:c12166a4 r5:00000000 r4:00001155
[  728.062460] [<c0350834>] (__alloc_pages_nodemask) from [<c021e9d4>] (copy_process.part.5+0x114/0x1a28)
[  728.071764]  r10:00000000 r9:dd358000 r8:00000000 r7:c1447e08 r6:c1216588 r5:00808111
[  728.079587]  r4:d1063c00
[  728.082119] [<c021e8c0>] (copy_process.part.5) from [<c0220470>] (_do_fork+0xd0/0x464)
[  728.090034]  r10:00000000 r9:00000000 r8:dd008400 r7:00000000 r6:c1216588 r5:d2d58ac0
[  728.097857]  r4:00808111
[  728.100388] [<c02203a0>] (_do_fork) from [<c0220864>] (kernel_thread+0x38/0x40)
[  728.107696]  r10:00000000 r9:c1422594 r8:dd008400 r7:00000000 r6:dd004500 r5:d2d58ac0
[  728.115519]  r4:c1216588
[  728.118055] [<c022082c>] (kernel_thread) from [<c0239a74>] (call_usermodehelper_exec_work+0x44/0xe0)
[  728.127188] [<c0239a30>] (call_usermodehelper_exec_work) from [<c023d088>] (process_one_work+0x154/0x518)
[  728.136756]  r5:d2d58ac0 r4:dd234100
[  728.140335] [<c023cf34>] (process_one_work) from [<c023d4a4>] (worker_thread+0x58/0x56c)
[  728.148424]  r10:00000088 r9:dd234100 r8:dd234118 r7:c120f900 r6:dd346038 r5:dd008424
[  728.156247]  r4:dd008400
[  728.158780] [<c023d44c>] (worker_thread) from [<c0244198>] (kthread+0x134/0x164)
[  728.166174]  r10:dd233e68 r9:dd2341a8 r8:c023d44c r7:dd234100 r6:dd236280 r5:00000000
[  728.173997]  r4:dd234180
[  728.176531] [<c0244064>] (kthread) from [<c0209258>] (ret_from_fork+0x14/0x3c)
[  728.183752]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c0244064
[  728.191575]  r4:dd236280 r3:00000000
[  728.199092] Mem-Info:
[  728.201407] active_anon:97307 inactive_anon:124 isolated_anon:0
[  728.201407]  active_file:583 inactive_file:575 isolated_file:64
[  728.201407]  unevictable:638 dirty:0 writeback:0 unstable:0
[  728.201407]  slab_reclaimable:4681 slab_unreclaimable:7808
[  728.201407]  mapped:1656 shmem:182 pagetables:4482 bounce:0
[  728.201407]  free:143605 free_pcp:230 free_cma:139244
[  728.235525] Node 0 active_anon:389228kB inactive_anon:496kB active_file:2072kB inactive_file:2456kB unevictable:2552kB isolated(anon):0kB isolated(file):0kB mapped:5984kB dirty:0kB writeback:0kB shmem:728kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
[  728.260031] DMA free:17960kB min:16384kB low:25664kB high:29760kB active_anon:3556kB inactive_anon:0kB active_file:280kB inactive_file:28kB unevictable:0kB writepending:0kB present:458752kB managed:422896kB mlocked:0kB kernel_stack:6496kB pagetables:9904kB bounce:0kB free_pcp:348kB local_pcp:0kB free_cma:0kB
[  728.287402] lowmem_reserve[]: 0 0 579 579
[  728.292470] HighMem free:553472kB min:512kB low:34024kB high:48808kB active_anon:385672kB inactive_anon:496kB active_file:1820kB inactive_file:5284kB unevictable:2552kB writepending:0kB present:1526784kB managed:1526784kB mlocked:2552kB kernel_stack:0kB pagetables:7272kB bounce:0kB free_pcp:324kB local_pcp:0kB free_cma:553588kB
[  728.322946] lowmem_reserve[]: 0 0 0 0
[  728.326634] DMA: 71*4kB (EH) 113*8kB (UH) 207*16kB (UMH) 103*32kB (UMH) 70*64kB (UMH) 27*128kB (UMH) 5*256kB (UMH) 1*512kB (H) 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 17524kB
[  728.344398] HighMem: 8121*4kB (C) 7772*8kB (C) 4391*16kB (C) 2354*32kB (C) 1335*64kB (C) 514*128kB (C) 162*256kB (C) 76*512kB (C) 27*1024kB (C) 12*2048kB (C) 2*4096kB (C) 2*8192kB (C) 0*16384kB = 548660kB
[  728.364376] 3561 total pagecache pages
[  728.368825] 0 pages in swap cache
[  728.372226] Swap cache stats: add 0, delete 0, find 0/0
[  728.379273] Free swap  = 0kB
[  728.382256] Total swap = 0kB
[  728.385418] 496384 pages RAM
[  728.388337] 381696 pages HighMem/MovableOnly
[  728.393901] 8964 pages reserved
[  728.397087] 233472 pages cma reserved


I have sufficient memory is available as per logs, and in logs it requires order = 1 ?
Then why oom-killer triggered ?

What is  71*4kB (EH) , (UMH) , (UH) and (C) ?

Regards,
Pankaj



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