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Date: Sun, 31 Jul 2016 17:10:47 +0200 From: Michal Hocko <mhocko@...nel.org> To: Markus Trippelsdorf <markus@...ppelsdorf.de> Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org Subject: Re: OOM killer invoked during btrfs send/recieve on otherwise idle machine [CC Mel and linux-mm] On Sun 31-07-16 07:11:21, Markus Trippelsdorf wrote: > Tonight the OOM killer got invoked during backup of /: > > [Jul31 01:56] kthreadd invoked oom-killer: gfp_mask=0x27000c0(GFP_KERNEL_ACCOUNT|__GFP_NOTRACK), order=2, oom_score_adj=0 This a kernel stack allocation. > [ +0.000004] CPU: 3 PID: 2 Comm: kthreadd Not tainted 4.7.0-06816-g797cee982eef-dirty #37 > [ +0.000000] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503 04/13/2011 > [ +0.000002] 0000000000000000 ffffffff813c2d58 ffff8802168e7d48 00000000002ec4ea > [ +0.000002] ffffffff8118eb9d 00000000000001b8 0000000000000440 00000000000003b0 > [ +0.000002] ffff8802133fe400 00000000002ec4ea ffffffff81b8ac9c 0000000000000006 > [ +0.000001] Call Trace: > [ +0.000004] [<ffffffff813c2d58>] ? dump_stack+0x46/0x6e > [ +0.000003] [<ffffffff8118eb9d>] ? dump_header.isra.11+0x4c/0x1a7 > [ +0.000002] [<ffffffff811382eb>] ? oom_kill_process+0x2ab/0x460 > [ +0.000001] [<ffffffff811387e3>] ? out_of_memory+0x2e3/0x380 > [ +0.000002] [<ffffffff81141532>] ? __alloc_pages_slowpath.constprop.124+0x1d32/0x1e40 > [ +0.000001] [<ffffffff81141b4c>] ? __alloc_pages_nodemask+0x10c/0x120 > [ +0.000002] [<ffffffff810939aa>] ? copy_process.part.72+0xea/0x17a0 > [ +0.000002] [<ffffffff810d1a55>] ? pick_next_task_fair+0x915/0x1520 > [ +0.000001] [<ffffffff810b7a00>] ? kthread_flush_work_fn+0x20/0x20 > [ +0.000001] [<ffffffff8109549a>] ? kernel_thread+0x7a/0x1c0 > [ +0.000001] [<ffffffff810b82f2>] ? kthreadd+0xd2/0x120 > [ +0.000002] [<ffffffff818d828f>] ? ret_from_fork+0x1f/0x40 > [ +0.000001] [<ffffffff810b8220>] ? kthread_stop+0x100/0x100 > [ +0.000001] Mem-Info: > [ +0.000003] active_anon:5882 inactive_anon:60307 isolated_anon:0 > active_file:1523729 inactive_file:223965 isolated_file:0 > unevictable:1970 dirty:130014 writeback:40735 unstable:0 > slab_reclaimable:179690 slab_unreclaimable:8041 > mapped:6771 shmem:3 pagetables:592 bounce:0 > free:11374 free_pcp:54 free_cma:0 > [ +0.000004] Node 0 active_anon:23528kB inactive_anon:241228kB active_file:6094916kB inactive_file:895860kB unevictable:7880kB isolated(anon):0kB isolated(file):0kB mapped:27084kB dirty:520056kB writeback:162940kB shmem:12kB writeback_tmp:0kB unstable:0kB pages_scanned:32 all_unreclaimable? no > [ +0.000002] DMA free:15908kB min:20kB low:32kB high:44kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > [ +0.000001] lowmem_reserve[]: 0 3486 7953 7953 > [ +0.000004] DMA32 free:23456kB min:4996kB low:8564kB high:12132kB active_anon:2480kB inactive_anon:10564kB active_file:2559792kB inactive_file:478680kB unevictable:0kB writepending:365292kB present:3652160kB managed:3574264kB mlocked:0kB slab_reclaimable:437456kB slab_unreclaimable:12304kB kernel_stack:144kB pagetables:28kB bounce:0kB free_pcp:212kB local_pcp:0kB free_cma:0kB > [ +0.000001] lowmem_reserve[]: 0 0 4466 4466 > [ +0.000003] Normal free:6132kB min:6400kB low:10972kB high:15544kB active_anon:21048kB inactive_anon:230664kB active_file:3535124kB inactive_file:417312kB unevictable:7880kB writepending:318020kB present:4718592kB managed:4574096kB mlocked:7880kB slab_reclaimable:281304kB slab_unreclaimable:19860kB kernel_stack:2944kB pagetables:2340kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > [ +0.000000] lowmem_reserve[]: 0 0 0 0 > [ +0.000002] DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (U) 3*4096kB (M) = 15908kB > [ +0.000005] DMA32: 4215*4kB (UMEH) 319*8kB (UMH) 5*16kB (H) 2*32kB (H) 2*64kB (H) 1*128kB (H) 0*256kB 1*512kB (H) 1*1024kB (H) 1*2048kB (H) 0*4096kB = 23396kB > [ +0.000006] Normal: 650*4kB (UMH) 4*8kB (UH) 27*16kB (H) 23*32kB (H) 17*64kB (H) 11*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 6296kB The memory is quite fragmented but there are order-2+ free blocks. They seem to be in the high atomic reserves but we should release them. Is this reproducible? If yes, could you try with the 4.7 kernel please? Keeping the rest of the emil for reference. > [ +0.000005] 1749526 total pagecache pages > [ +0.000001] 150 pages in swap cache > [ +0.000001] Swap cache stats: add 1222, delete 1072, find 2366/2401 > [ +0.000000] Free swap = 4091520kB > [ +0.000001] Total swap = 4095996kB > [ +0.000000] 2096686 pages RAM > [ +0.000001] 0 pages HighMem/MovableOnly > [ +0.000000] 55619 pages reserved > [ +0.000001] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name > [ +0.000004] [ 153] 0 153 4087 406 9 3 104 -1000 udevd > [ +0.000001] [ 181] 0 181 5718 1169 15 3 143 0 syslog-ng > [ +0.000001] [ 187] 102 187 88789 5137 53 3 663 0 mpd > [ +0.000002] [ 188] 0 188 22278 1956 16 3 0 0 ntpd > [ +0.000001] [ 189] 0 189 4973 859 14 3 188 0 cupsd > [ +0.000001] [ 192] 0 192 2680 391 10 3 21 0 fcron > [ +0.000001] [ 219] 0 219 4449 506 13 3 0 0 login > [ +0.000002] [ 220] 0 220 2876 368 9 3 0 0 agetty > [ +0.000001] [ 222] 31 222 27193 20995 57 3 0 0 squid > [ +0.000001] [ 225] 1000 225 7410 3878 17 3 0 0 zsh > [ +0.000001] [ 297] 1000 297 9339 4771 23 3 0 0 tmux > [ +0.000001] [ 298] 0 298 4674 571 13 3 0 0 sudo > [ +0.000001] [ 300] 0 300 4674 588 13 3 0 0 sudo > [ +0.000002] [ 302] 1000 302 2721 738 9 3 0 0 sh > [ +0.000001] [ 304] 1000 304 18149 5230 35 3 0 0 ncmpcpp > [ +0.000014] [ 307] 1000 307 19239 13079 40 3 0 0 mutt > [ +0.000001] [ 309] 1000 309 7550 4002 17 3 0 0 zsh > [ +0.000001] [ 311] 1000 311 7620 4089 18 3 0 0 zsh > [ +0.000002] [ 313] 0 313 4072 568 13 3 0 0 su > [ +0.000001] [ 314] 0 314 4072 560 14 3 0 0 su > [ +0.000001] [ 315] 1000 315 7554 4045 19 3 0 0 zsh > [ +0.000001] [ 317] 1000 317 7571 4030 18 3 0 0 zsh > [ +0.000001] [ 319] 1000 319 7624 4097 18 3 0 0 zsh > [ +0.000002] [ 334] 0 334 5511 1952 15 3 0 0 zsh > [ +0.000001] [ 335] 0 335 5539 2059 15 3 0 0 zsh > [ +0.000001] [ 376] 0 376 4674 553 14 3 0 0 sudo > [ +0.000001] [ 377] 0 377 6915 2915 17 3 0 0 multitail > [ +0.000001] [ 378] 0 378 1829 146 8 3 0 0 tail > [ +0.000001] [ 379] 0 379 1829 144 8 3 0 0 tail > [ +0.000002] [14764] 1000 14764 6731 2363 16 3 0 0 mc > [ +0.000005] [22909] 0 22909 2680 430 10 3 8 0 fcron > [ +0.000003] [22910] 0 22910 1943 612 8 3 0 0 sh > [ +0.000002] [22915] 0 22915 3915 242 8 3 0 0 btrfs > [ +0.000003] [22916] 0 22916 1866 245 8 3 0 0 btrfs > [ +0.000003] Out of memory: Kill process 222 (squid) score 6 or sacrifice child > [ +0.001307] Killed process 222 (squid) total-vm:108772kB, anon-rss:76336kB, file-rss:7632kB, shmem-rss:12kB > > The machine was otherwise idle (I was asleep). I have 8GB of memory. > > This is the backup script that I run daily at 01:52: > > x4 ~ # cat /sbin/snapshot_btrfs > btrfs subvolume snapshot -r / /root/snap-new > sync > btrfs send -p /root/snap /root/snap-new | btrfs receive /var/.snapshots > sync > btrfs subvolume delete /root/snap > mv /root/snap-new /root/snap > mv /var/.snapshots/snap /var/.snapshots/snap.$(date +%Y-%m-%d) > mv /var/.snapshots/snap-new /var/.snapshots/snap > > The OOM killer triggered during btrfs send/receive. > > I'm running the latest git kernel. > > -- > Markus -- Michal Hocko SUSE Labs
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