I see some more logs about memory in syslog: Nov 17 10:47:17 ceph1 kernel: [2810698.553749] Node 0 DMA free:14828kB min:32kB low:40kB high:48kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15996kB managed:15896kB 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_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes Nov 17 10:47:17 ceph1 kernel: [2810698.553753] lowmem_reserve[]: 0 1830 32011 32011 32011 Nov 17 10:47:17 ceph1 kernel: [2810698.553755] Node 0 DMA32 free:134848kB min:3860kB low:4824kB high:5788kB active_anon:120628kB inactive_anon:121792kB active_file:653404kB inactive_file:399272kB unevictable:0kB isolated(anon):0kB isolated(file):36kB present:1981184kB managed:1900752kB mlocked:0kB dirty:344kB writeback:0kB mapped:1200kB shmem:0kB slab_reclaimable:239900kB slab_unreclaimable:154560kB kernel_stack:43376kB pagetables:1176kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Nov 17 10:47:17 ceph1 kernel: [2810698.553758] lowmem_reserve[]: 0 0 30180 30180 30180 Nov 17 10:47:17 ceph1 kernel: [2810698.553760] Node 0 Normal free:237232kB min:63684kB low:79604kB high:95524kB active_anon:3075228kB inactive_anon:629052kB active_file:12544336kB inactive_file:12570716kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:31457280kB managed:30905084kB mlocked:0kB dirty:74368kB writeback:3796kB mapped:48516kB shmem:1276kB slab_reclaimable:713684kB slab_unreclaimable:416404kB kernel_stack:40896kB pagetables:25288kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Nov 17 10:47:17 ceph1 kernel: [2810698.553763] lowmem_reserve[]: 0 0 0 0 0 Nov 17 10:47:17 ceph1 kernel: [2810698.553765] Node 0 DMA: 1*4kB (U) 1*8kB (U) 0*16kB 1*32kB (U) 3*64kB (U) 2*128kB (U) 0*256kB 0*512kB 0*1024kB 1*2048kB (M) 3*4096kB (M) = 14828kB Nov 17 10:47:17 ceph1 kernel: [2810698.553772] Node 0 DMA32: 10756*4kB (UME) 11442*8kB (UME) 25*16kB (UE) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 134960kB Nov 17 10:47:17 ceph1 kernel: [2810698.553777] Node 0 Normal: 59473*4kB (UME) 77*8kB (U) 10*16kB (H) 8*32kB (H) 6*64kB (H) 2*128kB (H) 1*256kB (H) 1*512kB (H) 0*1024kB 0*2048kB 0*4096kB = 240332kB Nov 17 10:47:17 ceph1 kernel: [2810698.553784] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Nov 17 10:47:17 ceph1 kernel: [2810698.553784] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB Nov 17 10:47:17 ceph1 kernel: [2810698.553785] 6544612 total pagecache pages Nov 17 10:47:17 ceph1 kernel: [2810698.553786] 2347 pages in swap cache Nov 17 10:47:17 ceph1 kernel: [2810698.553787] Swap cache stats: add 2697126, delete 2694779, find 38874122/39241548 Nov 17 10:47:17 ceph1 kernel: [2810698.553788] Free swap = 61498092kB Nov 17 10:47:17 ceph1 kernel: [2810698.553788] Total swap = 62498812kB Nov 17 10:47:17 ceph1 kernel: [2810698.553789] 8363615 pages RAM Nov 17 10:47:17 ceph1 kernel: [2810698.553790] 0 pages HighMem/MovableOnly Nov 17 10:47:17 ceph1 kernel: [2810698.553790] 158182 pages reserved Nov 17 10:47:17 ceph1 kernel: [2810698.553791] 0 pages cma reserved
Is it relate to page caches? 2017-11-18 7:22 GMT+07:00 Sam Huracan <nowitzki.sa...@gmail.com>: > Today, one of our Ceph OSDs was down, I've check syslog and see this OSD > process was killed by OMM > > > Nov 17 10:01:06 ceph1 kernel: [2807926.762304] Out of memory: Kill process > 3330 (ceph-osd) score 7 or sacrifice child > Nov 17 10:01:06 ceph1 kernel: [2807926.763745] Killed process 3330 > (ceph-osd) total-vm:2372392kB, anon-rss:559084kB, file-rss:7268kB > Nov 17 10:01:06 ceph1 kernel: [2807926.985830] init: ceph-osd (ceph/6) > main process (3330) killed by KILL signal > Nov 17 10:01:06 ceph1 kernel: [2807926.985844] init: ceph-osd (ceph/6) > main process ended, respawning > Nov 17 10:03:39 ceph1 bash: root [15524]: sudo ceph health detail [0] > Nov 17 10:03:40 ceph1 bash: root [15524]: sudo ceph health detail [0] > Nov 17 10:17:01 ceph1 CRON[75167]: (root) CMD ( cd / && run-parts > --report /etc/cron.hourly) > Nov 17 10:47:17 ceph1 kernel: [2810698.553690] ceph-status.sh invoked > oom-killer: gfp_mask=0x26000c0, order=2, oom_score_adj=0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553693] ceph-status.sh cpuset=/ > mems_allowed=0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553697] CPU: 5 PID: 194271 Comm: > ceph-status.sh Not tainted 4.4.0-62-generic #83~14.04.1-Ubuntu > Nov 17 10:47:17 ceph1 kernel: [2810698.553698] Hardware name: Dell Inc. > PowerEdge R730xd/072T6D, BIOS 2.5.5 08/16/2017 > Nov 17 10:47:17 ceph1 kernel: [2810698.553699] 0000000000000000 > ffff88001a857b38 ffffffff813dc4ac ffff88001a857cf0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553701] 0000000000000000 > ffff88001a857bc8 ffffffff811fb066 ffff88083d29e200 > Nov 17 10:47:17 ceph1 kernel: [2810698.553703] ffff88001a857cf0 > ffff88001a857c00 ffff8808453cf000 0000000000000000 > Nov 17 10:47:17 ceph1 kernel: [2810698.553704] Call Trace: > Nov 17 10:47:17 ceph1 kernel: [2810698.553709] [<ffffffff813dc4ac>] > dump_stack+0x63/0x87 > Nov 17 10:47:17 ceph1 kernel: [2810698.553713] [<ffffffff811fb066>] > dump_header+0x5b/0x1d5 > Nov 17 10:47:17 ceph1 kernel: [2810698.553717] [<ffffffff81188b75>] > oom_kill_process+0x205/0x3d0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553718] [<ffffffff8118857e>] ? > oom_unkillable_task+0x9e/0xc0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553720] [<ffffffff811891ab>] > out_of_memory+0x40b/0x460 > Nov 17 10:47:17 ceph1 kernel: [2810698.553722] [<ffffffff811fbb1f>] > __alloc_pages_slowpath.constprop.87+0x742/0x7ad > Nov 17 10:47:17 ceph1 kernel: [2810698.553725] [<ffffffff8118e1a7>] > __alloc_pages_nodemask+0x237/0x240 > Nov 17 10:47:17 ceph1 kernel: [2810698.553727] [<ffffffff8118e36d>] > alloc_kmem_pages_node+0x4d/0xd0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553730] [<ffffffff8107c125>] > copy_process+0x185/0x1ce0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553732] [<ffffffff813320f3>] ? > security_file_alloc+0x33/0x50 > Nov 17 10:47:17 ceph1 kernel: [2810698.553734] [<ffffffff8107de1a>] > _do_fork+0x8a/0x310 > Nov 17 10:47:17 ceph1 kernel: [2810698.553737] [<ffffffff8108dc01>] ? > sigprocmask+0x51/0x80 > Nov 17 10:47:17 ceph1 kernel: [2810698.553738] [<ffffffff8107e149>] > SyS_clone+0x19/0x20 > Nov 17 10:47:17 ceph1 kernel: [2810698.553743] [<ffffffff81802d36>] > entry_SYSCALL_64_fastpath+0x16/0x75 > Nov 17 10:47:17 ceph1 kernel: [2810698.553744] Mem-Info: > Nov 17 10:47:17 ceph1 kernel: [2810698.553747] active_anon:798964 > inactive_anon:187711 isolated_anon:0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553747] active_file:3299435 > inactive_file:3242497 isolated_file:9 > Nov 17 10:47:17 ceph1 kernel: [2810698.553747] unevictable:0 dirty:18678 > writeback:949 unstable:0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553747] slab_reclaimable:238396 > slab_unreclaimable:142741 > Nov 17 10:47:17 ceph1 kernel: [2810698.553747] mapped:12429 shmem:319 > pagetables:6616 bounce:0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553747] free:96727 free_pcp:0 > free_cma:0 > Nov 17 10:47:17 ceph1 kernel: [2810698.553749] Node 0 DMA free:14828kB > min:32kB low:40kB high:48kB active_anon:0kB inactive_anon:0kB > active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB > isolated(file):0kB present:15996kB managed:15896kB 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_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB > pages_scanned:0 all_unreclaimable? yes > Nov 17 10:47:17 ceph1 kernel: [2810698.553753] lowmem_reserve[]: 0 1830 > 32011 32011 32011 > Nov 17 10:47:17 ceph1 kernel: [2810698.553755] Node 0 DMA32 free:134848kB > min:3860kB low:4824kB high:5788kB active_anon:120628kB > inactive_anon:121792kB active_file:653404kB inactive_file:399272kB > unevictable:0kB isolated(anon):0kB isolated(file):36kB present:1981184kB > managed:1900752kB mlocked:0kB dirty:344kB writeback:0kB mapped:1200kB > shmem:0kB slab_reclaimable:239900kB slab_unreclaimable:154560kB > kernel_stack:43376kB pagetables:1176kB unstable:0kB bounce:0kB free_pcp:0kB > local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 > all_unreclaimable? no > > > We check free Memory, Cache is free 24,705 MB > > root@ceph1:/var/log# free -m > total used free shared buffers cached > Mem: 32052 31729 323 1 125 24256 > -/+ buffers/cache: 7347 24705 > Swap: 61033 120 60913 > > > > It's so weird. Could you help me solve this problem, I'm afraid it 'll > come again. > > Thanks in advance. > > > >
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