On Tue, 24 Apr 2018, christophe leroy wrote: > Hi > > Allthough there is still about one forth of memory available (7976kB > among 32MB), oom-killer is invoked and makes a victim. > > What could be the reason and how could it be solved ? > > [ 54.400754] S99watchdogd-ap invoked oom-killer: > gfp_mask=0x27000c0(GFP_KERNEL_ACCOUNT|__GFP_NOTRACK), nodemask=0, > order=1, oom_score_adj=0 > [ 54.400815] CPU: 0 PID: 777 Comm: S99watchdogd-ap Not tainted > 4.9.85-local-knld-998 #5 > [ 54.400830] Call Trace: > [ 54.400910] [c1ca5d10] [c0327d28] dump_header.isra.4+0x54/0x17c > (unreliable) > [ 54.400998] [c1ca5d50] [c0079d88] oom_kill_process+0xc4/0x414 > [ 54.401067] [c1ca5d90] [c007a5c8] out_of_memory+0x35c/0x37c > [ 54.401220] [c1ca5dc0] [c007d68c] __alloc_pages_nodemask+0x8ec/0x9a8 > [ 54.401318] [c1ca5e70] [c00169d4] copy_process.isra.9.part.10+0xdc/0x10d0 > [ 54.401398] [c1ca5f00] [c0017b30] _do_fork+0xcc/0x2a8 > [ 54.401473] [c1ca5f40] [c000a660] ret_from_syscall+0x0/0x38 Looks like this is because the allocation is order-1, likely the allocation of a struct task_struct for a new process on fork. I'm interested in your platform, though, with 512KB and 8MB hugepages. Could you send the .config and also describe the system a bit more? How many cpus are there and does this always happen? > [ 54.401501] Mem-Info: > [ 54.401616] active_anon:2727 inactive_anon:91 isolated_anon:0 > [ 54.401616] active_file:51 inactive_file:26 isolated_file:0 > [ 54.401616] unevictable:604 dirty:0 writeback:0 unstable:0 > [ 54.401616] slab_reclaimable:115 slab_unreclaimable:722 > [ 54.401616] mapped:787 shmem:284 pagetables:167 bounce:0 > [ 54.401616] free:1994 free_pcp:0 free_cma:0 > [ 54.401715] Node 0 active_anon:10908kB inactive_anon:364kB > active_file:204kB inactive_file:104kB unevictable:2416kB > isolated(anon):0kB isolated(file):0kB mapped:3148kB dirty:0kB > writeback:0kB shmem:1136kB writeback_tmp:0kB unstable:0kB > pages_scanned:59 all_unreclaimable? no > [ 54.401851] DMA free:7976kB min:660kB low:824kB high:988kB > active_anon:10908kB inactive_anon:364kB active_file:204kB > inactive_file:104kB unevictable:2416kB writepending:0kB present:32768kB > managed:27912kB mlocked:2416kB slab_reclaimable:460kB > slab_unreclaimable:2888kB kernel_stack:880kB pagetables:668kB bounce:0kB > free_pcp:0kB local_pcp:0kB free_cma:0kB > lowmem_reserve[]: 0 0 0 > [ 54.437414] DMA: 460*4kB (UH) 201*8kB (UH) 121*16kB (UH) 43*32kB (UH) > 10*64kB (U) 4*128kB (UH) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB > 0*8192kB = 7912kB > [ 54.437730] Node 0 hugepages_total=0 hugepages_free=0 > hugepages_surp=0 hugepages_size=512kB > [ 54.437768] Node 0 hugepages_total=0 hugepages_free=0 > hugepages_surp=0 hugepages_size=8192kB > [ 54.437784] 892 total pagecache pages > [ 54.437802] 8192 pages RAM > [ 54.437818] 0 pages HighMem/MovableOnly > [ 54.437834] 1214 pages reserved > [ 54.437854] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds > swapents oom_score_adj name > [ 54.437928] [ 216] 0 216 1240 253 6 0 > 0 0 rcS > [ 54.437986] [ 356] 0 356 4687 333 7 0 > 0 0 rsyslogd > [ 54.438042] [ 360] 0 360 1240 245 5 0 > 0 0 klogd > [ 54.438099] [ 370] 0 370 701 607 5 0 > 0 -1000 watchdog > [ 54.438156] [ 384] 0 384 1114 440 5 0 > 0 0 ntpd > [ 54.438213] [ 401] 0 401 1279 419 6 0 > 0 0 inetd > [ 54.438270] [ 413] 0 413 1240 330 6 0 > 0 0 crond > [ 54.438328] [ 587] 0 587 3334 586 7 0 > 0 0 CORSurv > [ 54.438384] [ 614] 0 614 484 232 5 0 > 0 0 ASMcsci > [ 54.438441] [ 662] 0 662 18777 625 13 0 > 0 0 VOIPcsc > [ 54.438499] [ 708] 0 708 18402 1166 22 0 > 0 0 RCUSwitch > [ 54.447253] [ 739] 0 739 12958 1275 17 0 > 0 0 CRI_main > [ 54.447320] [ 756] 0 756 1240 380 6 0 > 0 0 exe > [ 54.447379] [ 757] 0 757 1240 369 6 0 > 0 0 S99watchdogd-ap > [ 54.447436] [ 777] 0 777 1240 210 5 0 > 0 0 S99watchdogd-ap > [ 54.447493] [ 782] 0 782 793 425 5 0 > 0 0 socat > [ 54.447550] [ 784] 0 784 754 420 5 0 > 0 0 socat > [ 54.447607] [ 791] 0 791 793 426 5 0 > 0 0 socat > [ 54.447663] [ 792] 0 792 754 420 5 0 > 0 0 socat > [ 54.447720] [ 799] 0 799 793 426 5 0 > 0 0 socat > [ 54.447777] [ 800] 0 800 754 420 5 0 > 0 0 socat > [ 54.447833] [ 807] 0 807 793 425 5 0 > 0 0 socat > [ 54.447890] [ 808] 0 808 754 421 5 0 > 0 0 socat > [ 54.447927] Out of memory: Kill process 739 (CRI_main) score 180 or > sacrifice child > [ 54.528280] Killed process 739 (CRI_main) total-vm:51832kB, > anon-rss:3140kB, file-rss:1592kB, shmem-rss:236kB
