Отладка Debian Nightly Oom-Killer

Я на Debian Linux server-sl 4.18.0-2-amd64 #1 SMP Debian 4.18.10-2 (2018-11-02) x86_64 GNU/Linux.

Средняя нагрузка и память действительно низкие:

09:26:17 up 3 days, 20:54,  1 user,  load average: 0,16, 0,07, 0,27

бесплатно -m

              total        used        free      shared  buff/cache   available
Mem:           7811        1633        5643         253         534        5674
Swap:             0           0           0

После последнего обновления поздно ночью сообщите об этом из journalctl:

ov 26 05:32:17 server-sl kernel: jsvc invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null), order=0, oom_score_adj=0
nov 26 05:32:17 server-sl kernel: jsvc cpuset=/ mems_allowed=0
nov 26 05:32:17 server-sl kernel: CPU: 3 PID: 10458 Comm: jsvc Not tainted 4.18.0-2-amd64 #1 Debian 4.18.10-2
nov 26 05:32:17 server-sl kernel: Hardware name: Dell Inc. PowerEdge T130/0FGCC7, BIOS 1.3.2 03/28/2016
nov 26 05:32:17 server-sl kernel: Call Trace:
nov 26 05:32:17 server-sl kernel:  dump_stack+0x5c/0x7b
nov 26 05:32:17 server-sl kernel:  dump_header+0x6b/0x289
nov 26 05:32:17 server-sl kernel:  oom_kill_process+0x228/0x430
nov 26 05:32:17 server-sl kernel:  ? oom_badness+0x23/0x120
nov 26 05:32:17 server-sl kernel:  out_of_memory+0x2ab/0x4b0
nov 26 05:32:17 server-sl kernel:  __alloc_pages_slowpath+0x9c3/0xd40
nov 26 05:32:17 server-sl kernel:  __alloc_pages_nodemask+0x236/0x250
nov 26 05:32:17 server-sl kernel:  filemap_fault+0x36f/0x740
nov 26 05:32:17 server-sl kernel:  ? filemap_map_pages+0x18a/0x3a0
nov 26 05:32:17 server-sl kernel:  ext4_filemap_fault+0x2c/0x40 [ext4]
nov 26 05:32:17 server-sl kernel:  __do_fault+0x1f/0xe0
nov 26 05:32:17 server-sl kernel:  __handle_mm_fault+0xd4b/0x1470
nov 26 05:32:17 server-sl kernel:  ? __switch_to_asm+0x40/0x70
nov 26 05:32:17 server-sl kernel:  handle_mm_fault+0xdc/0x210
nov 26 05:32:17 server-sl kernel:  __do_page_fault+0x256/0x4e0
nov 26 05:32:17 server-sl kernel:  ? page_fault+0x8/0x30
nov 26 05:32:17 server-sl kernel:  page_fault+0x1e/0x30
nov 26 05:32:17 server-sl kernel: RIP: 0033:0x7fd01097dd40
nov 26 05:32:17 server-sl kernel: Code: Bad RIP value.
nov 26 05:32:17 server-sl kernel: RSP: 002b:00007fcfef271da8 EFLAGS: 00010202
nov 26 05:32:17 server-sl kernel: RAX: 00007fd010e4fab8 RBX: 0000000000000036 RCX: 0000000000000002
nov 26 05:32:17 server-sl kernel: RDX: 0000000000000000 RSI: 00007fd010f0b40c RDI: 0000556709d79ca0
nov 26 05:32:17 server-sl kernel: RBP: 00007fcfef271df0 R08: 0000000000000000 R09: 0000000000000032
nov 26 05:32:17 server-sl kernel: R10: 00007fcfef271db0 R11: 0000000000000001 R12: 00007fd010f10e20
nov 26 05:32:17 server-sl kernel: R13: 0000000000000001 R14: 0000000000000002 R15: 0000000000000001
nov 26 05:32:17 server-sl kernel: Mem-Info:
nov 26 05:32:17 server-sl kernel: active_anon:1842329 inactive_anon:50069 isolated_anon:0
                                   active_file:204 inactive_file:178 isolated_file:0
                                   unevictable:0 dirty:0 writeback:0 unstable:0
                                   slab_reclaimable:11451 slab_unreclaimable:23168
                                   mapped:8214 shmem:57538 pagetables:20490 bounce:0
                                   free:26438 free_pcp:970 free_cma:0
nov 26 05:32:17 server-sl kernel: Node 0 active_anon:7369316kB inactive_anon:200276kB active_file:816kB inactive_file:712kB unevictable:0kB isolated(anon):0kB
nov 26 05:32:17 server-sl kernel: Node 0 DMA free:15888kB min:132kB low:164kB high:196kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB u
nov 26 05:32:17 server-sl kernel: lowmem_reserve[]: 0 2032 7768 7768 7768
nov 26 05:32:17 server-sl kernel: Node 0 DMA32 free:40088kB min:17640kB low:22048kB high:26456kB active_anon:2018172kB inactive_anon:22036kB active_file:324kB
nov 26 05:32:17 server-sl kernel: lowmem_reserve[]: 0 0 5736 5736 5736
nov 26 05:32:17 server-sl kernel: Node 0 Normal free:49776kB min:49804kB low:62252kB high:74700kB active_anon:5351144kB inactive_anon:178240kB active_file:868
nov 26 05:32:17 server-sl kernel: lowmem_reserve[]: 0 0 0 0 0
nov 26 05:32:17 server-sl kernel: Node 0 DMA: 0*4kB 0*8kB 1*16kB (U) 0*32kB 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) 
nov 26 05:32:17 server-sl kernel: Node 0 DMA32: 396*4kB (UME) 272*8kB (UME) 262*16kB (UME) 278*32kB (UME) 130*64kB (UME) 45*128kB (UME) 11*256kB (UE) 7*512kB 
nov 26 05:32:17 server-sl kernel: Node 0 Normal: 809*4kB (UMEH) 509*8kB (UMEH) 240*16kB (UMEH) 169*32kB (UMEH) 89*64kB (UMEH) 84*128kB (UMEH) 11*256kB (UME) 2
nov 26 05:32:17 server-sl kernel: Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
nov 26 05:32:17 server-sl kernel: Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
nov 26 05:32:17 server-sl kernel: 57877 total pagecache pages
nov 26 05:32:17 server-sl kernel: 0 pages in swap cache
nov 26 05:32:17 server-sl kernel: Swap cache stats: add 0, delete 0, find 0/0
nov 26 05:32:17 server-sl kernel: Free swap  = 0kB
nov 26 05:32:17 server-sl kernel: Total swap = 0kB

Ежедневно Cronjobs, кажется, работает нормально. Как я могу узнать, что происходит в этот час ночью?

Спасибо BR