My Wi-Fi scanner based on Raspberry pi was stopped with some problems

[ghost]

My Wi-Fi scanner was developed by Nexmon (https://github.com/seemoo-lab/nexmon) based on Raspberry Pi 3B. During capturing the Wi-Fi probes, the scanner sometimes is stopped. The stop time is Mar 26 12:32:15 because we haven't had any data since then.

In fact, when I see the log file of the Pi, there are many warning like this: Could you understand that kinds of warning..?

Mar 26 12:32:15 monitoring-pi kernel: [126742.472373] python3: page allocation stalls for 10060ms, order:1,
mode:0x15080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), nodemask=(null)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472401] python3 cpuset=/ mems_allowed=0
Mar 26 12:32:15 monitoring-pi kernel: [126742.472422] CPU: 0 PID: 530 Comm: python3 Tainted: G C O
4.14.79-v7+ #1159
Mar 26 12:32:15 monitoring-pi kernel: [126742.472425] Hardware name: BCM2835
Mar 26 12:32:15 monitoring-pi kernel: [126742.472448] [<8010ff30>] (unwind_backtrace) from [<8010c174>] (sh
ow_stack+0x20/0x24)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472460] [<8010c174>] (show_stack) from [<80788fa4>] (dump_sta
ck+0xd4/0x118)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472473] [<80788fa4>] (dump_stack) from [<80228fc8>] (warn_all
oc+0xcc/0x17c)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472483] [<80228fc8>] (warn_alloc) from [<80229dbc>] (_alloc
pages_nodemask+0xc90/0x11d8)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472493] [<80229dbc>] (__alloc_pages_nodemask) from [<8011b398

] (copy_process.part.5+0xec/0x1858)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472500] [<8011b398>] (copy_process.part.5) from [<8011cc94>]
(_do_fork+0xc8/0x408)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472507] [<8011cc94>] (do_fork) from [<8011d0f8>] (SyS_clone+
0x34/0x3c)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472516] [<8011d0f8>] (SyS_clone) from [<80108000>] (ret_fast
syscall+0x0/0x28)
Mar 26 12:32:15 monitoring-pi kernel: [126742.472520] Mem-Info:
Mar 26 12:32:15 monitoring-pi kernel: [126742.472532] active_anon:112178 inactive_anon:112151 isolated_anon
:32
Mar 26 12:32:15 monitoring-pi kernel: [126742.472532] active_file:458 inactive_file:504 isolated_file:0
Mar 26 12:32:15 monitoring-pi kernel: [126742.472532] unevictable:0 dirty:4 writeback:0 unstable:0
Mar 26 12:32:15 monitoring-pi kernel: [126742.472532] slab_reclaimable:1571 slab_unreclaimable:2173
Mar 26 12:32:15 monitoring-pi kernel: [126742.472532] mapped:1269 shmem:193 pagetables:626 bounce:0
Mar 26 12:32:15 monitoring-pi kernel: [126742.472532] free:5003 free_pcp:0 free_cma:1696
Mar 26 12:32:15 monitoring-pi kernel: [126742.472540] Node 0 active_anon:448712kB inactive_anon:448604kB ac
tive_file:1832kB inactive_file:2016kB unevictable:0kB isolated(anon):128kB isolated(file):0kB mapped:5076kB
dirty:16kB writeback:0kB shmem:772kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Mar 26 12:32:15 monitoring-pi kernel: [126742.472552] Normal free:20012kB min:16384kB low:20480kB high:2457
6kB active_anon:448664kB inactive_anon:448608kB active_file:1832kB inactive_file:2016kB unevictable:0kB wri
tepending:16kB present:970752kB managed:949448kB mlocked:0kB kernel_stack:800kB pagetables:2504kB bounce:0k
B free_pcp:0kB local_pcp:0kB free_cma:6784kB
Mar 26 12:32:15 monitoring-pi kernel: [126742.472554] lowmem_reserve[]: 0 0
Mar 26 12:32:15 monitoring-pi kernel: [126742.472562] Normal: 2814kB (UMEC) 3078kB (UMEC) 16916kB (UMEC)
3532kB (UMEC) 1964kB (UMEC) 7128kB (UEC) 3256kB (U) 1512kB (E) 11024kB (E) 22048kB (EC) 14096kB (C
) = 20012kB
Mar 26 12:32:15 monitoring-pi kernel: [126742.472611] 1176 total pagecache pages
Mar 26 12:32:15 monitoring-pi kernel: [126742.472615] 0 pages in swap cache
Mar 26 12:32:15 monitoring-pi kernel: [126742.472618] Swap cache stats: add 25725, delete 25725, find 223/2
97
Mar 26 12:32:15 monitoring-pi kernel: [126742.472622] Free swap = 4kB
Mar 26 12:32:15 monitoring-pi kernel: [126742.472625] Total swap = 102396kB
Mar 26 12:32:15 monitoring-pi kernel: [126742.472627] 242688 pages RAM
Mar 26 12:32:15 monitoring-pi kernel: [126742.472630] 0 pages HighMem/MovableOnly
Mar 26 12:32:15 monitoring-pi kernel: [126742.472632] 5326 pages reserved
Mar 26 12:32:15 monitoring-pi kernel: [126742.472634] 2048 pages cma reserved
Mar 26 12:32:25 monitoring-pi kernel: [126752.433790] python3: page allocation stalls for 20020ms, order:1,
mode:0x15080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), nodemask=(null)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433815] python3 cpuset=/ mems_allowed=0
Mar 26 12:32:25 monitoring-pi kernel: [126752.433829] CPU: 3 PID: 530 Comm: python3 Tainted: G C O
4.14.79-v7+ #1159
Mar 26 12:32:25 monitoring-pi kernel: [126752.433832] Hardware name: BCM2835
Mar 26 12:32:25 monitoring-pi kernel: [126752.433854] [<8010ff30>] (unwind_backtrace) from [<8010c174>] (sh
ow_stack+0x20/0x24)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433864] [<8010c174>] (show_stack) from [<80788fa4>] (dump_sta
ck+0xd4/0x118)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433877] [<80788fa4>] (dump_stack) from [<80228fc8>] (warn_all
oc+0xcc/0x17c)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433888] [<80228fc8>] (warn_alloc) from [<80229dbc>] (_alloc
pages_nodemask+0xc90/0x11d8)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433898] [<80229dbc>] (__alloc_pages_nodemask) from [<8011b398
] (copy_process.part.5+0xec/0x1858)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433906] [<8011b398>] (copy_process.part.5) from [<8011cc94>]
(_do_fork+0xc8/0x408)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433913] [<8011cc94>] (do_fork) from [<8011d0f8>] (SyS_clone+
0x34/0x3c)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433921] [<8011d0f8>] (SyS_clone) from [<80108000>] (ret_fast
syscall+0x0/0x28)
Mar 26 12:32:25 monitoring-pi kernel: [126752.433925] Mem-Info:
Mar 26 12:32:25 monitoring-pi kernel: [126752.433937] active_anon:112140 inactive_anon:112156 isolated_anon
:64
Mar 26 12:32:25 monitoring-pi kernel: [126752.433937] active_file:321 inactive_file:413 isolated_file:0
Mar 26 12:32:25 monitoring-pi kernel: [126752.433937] unevictable:0 dirty:0 writeback:0 unstable:0
Mar 26 12:32:25 monitoring-pi kernel: [126752.433937] slab_reclaimable:1573 slab_unreclaimable:2173
Mar 26 12:32:25 monitoring-pi kernel: [126752.433937] mapped:1018 shmem:196 pagetables:626 bounce:0
Mar 26 12:32:25 monitoring-pi kernel: [126752.433937] free:5053 free_pcp:0 free_cma:1697
Mar 26 12:32:25 monitoring-pi kernel: [126752.433946] Node 0 active_anon:448660kB inactive_anon:448624kB ac
tive_file:1284kB inactive_file:1652kB unevictable:0kB isolated(anon):256kB isolated(file):0kB mapped:4072kB
dirty:0kB writeback:0kB shmem:784kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Mar 26 12:32:25 monitoring-pi kernel: [126752.433957] Normal free:20212kB min:16384kB low:20480kB high:2457
6kB active_anon:448352kB inactive_anon:448940kB active_file:788kB inactive_file:1952kB unevictable:0kB writ
epending:0kB present:970752kB managed:949448kB mlocked:0kB kernel_stack:792kB pagetables:2504kB bounce:0kB
free_pcp:0kB local_pcp:0kB free_cma:6788kB
Mar 26 12:32:25 monitoring-pi kernel: [126752.433960] lowmem_reserve[]: 0 0
Mar 26 12:32:25 monitoring-pi kernel: [126752.433968] Normal: 3794kB (UMEC) 3548kB (UMEC) 16916kB (UMEC)
3432kB (UMEC) 1864kB (UMEC) 8128kB (UMEC) 3256kB (U) 1512kB (E) 11024kB (E) 22048kB (EC) 14096kB (
C) = 20812kB
Mar 26 12:32:25 monitoring-pi kernel: [126752.434017] 965 total pagecache pages
Mar 26 12:32:25 monitoring-pi kernel: [126752.434020] 0 pages in swap cache
Mar 26 12:32:25 monitoring-pi kernel: [126752.434025] Swap cache stats: add 25731, delete 25731, find 225/3
00
Mar 26 12:32:25 monitoring-pi kernel: [126752.434028] Free swap = 4kB
Mar 26 12:32:25 monitoring-pi kernel: [126752.434030] Total swap = 102396kB
Mar 26 12:32:25 monitoring-pi kernel: [126752.434033] 242688 pages RAM
Mar 26 12:32:25 monitoring-pi kernel: [126752.434035] 0 pages HighMem/MovableOnly
Mar 26 12:32:25 monitoring-pi kernel: [126752.434037] 5326 pages reserved
Mar 26 12:32:25 monitoring-pi kernel: [126752.434040] 2048 pages cma reserved
Mar 26 12:32:35 monitoring-pi kernel: [126762.492476] python3: page allocation stalls for 30080ms, order:1,
mode:0x15080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), nodemask=(null)
Mar 26 12:32:36 monitoring-pi kernel: [126762.492516] python3 cpuset=/ mems_allowed=0
Mar 26 12:32:37 monitoring-pi kernel: [126762.492541] CPU: 2 PID: 530 Comm: python3 Tainted: G C O
4.14.79-v7+ #1159
Mar 26 12:32:37 monitoring-pi kernel: [126762.492546] Hardware name: BCM2835
Mar 26 12:32:37 monitoring-pi kernel: [126762.492579] [<8010ff30>] (unwind_backtrace) from [<8010c174>] (sh
ow_stack+0x20/0x24)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492597] [<8010c174>] (show_stack) from [<80788fa4>] (dump_sta
ck+0xd4/0x118)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492618] [<80788fa4>] (dump_stack) from [<80228fc8>] (warn_all
oc+0xcc/0x17c)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492639] [<80228fc8>] (warn_alloc) from [<80229dbc>] (_alloc
pages_nodemask+0xc90/0x11d8)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492657] [<80229dbc>] (__alloc_pages_nodemask) from [<8011b398
] (copy_process.part.5+0xec/0x1858)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492672] [<8011b398>] (copy_process.part.5) from [<8011cc94>]
(_do_fork+0xc8/0x408)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492685] [<8011cc94>] (do_fork) from [<8011d0f8>] (SyS_clone+
0x34/0x3c)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492701] [<8011d0f8>] (SyS_clone) from [<80108000>] (ret_fast
syscall+0x0/0x28)
Mar 26 12:32:37 monitoring-pi kernel: [126762.492709] Mem-Info:
Mar 26 12:32:37 monitoring-pi kernel: [126762.492731] active_anon:112151 inactive_anon:112232 isolated_anon
:0
Mar 26 12:32:37 monitoring-pi kernel: [126762.492731] active_file:101 inactive_file:435 isolated_file:0
Mar 26 12:32:37 monitoring-pi kernel: [126762.492731] unevictable:0 dirty:0 writeback:0 unstable:0
Mar 26 12:32:37 monitoring-pi kernel: [126762.492731] slab_reclaimable:1573 slab_unreclaimable:2173
Mar 26 12:32:37 monitoring-pi kernel: [126762.492731] mapped:967 shmem:198 pagetables:628 bounce:0
Mar 26 12:32:37 monitoring-pi kernel: [126762.492731] free:5360 free_pcp:2 free_cma:1697
Mar 26 12:32:37 monitoring-pi kernel: [126762.492748] Node 0 active_anon:448604kB inactive_anon:448928kB ac
tive_file:404kB inactive_file:1740kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:3868kB di
rty:0kB writeback:0kB shmem:792kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Mar 26 12:32:37 monitoring-pi kernel: [126762.492773] Normal free:21440kB min:16384kB low:20480kB high:2457
6kB active_anon:448604kB inactive_anon:448928kB active_file:404kB inactive_file:1876kB unevictable:0kB writ
epending:0kB present:970752kB managed:949448kB mlocked:0kB kernel_stack:792kB pagetables:2512kB bounce:0kB
free_pcp:8kB local_pcp:0kB free_cma:6788kB
Mar 26 12:32:37 monitoring-pi kernel: [126762.492781] lowmem_reserve[]: 0 0
Mar 26 12:32:37 monitoring-pi kernel: [126762.492810] Normal: 5514kB (UMEC) 3678kB (UMEC) 16916kB (UMEC)
3532kB (UMEC) 1864kB (UMEC) 8128kB (UMEC) 3256kB (U) 1512kB (E) 11024kB (E) 22048kB (EC) 14096kB (
C) = 21636kB
Mar 26 12:32:37 monitoring-pi kernel: [126762.492921] 752 total pagecache pages
Mar 26 12:32:37 monitoring-pi kernel: [126762.492928] 3 pages in swap cache
Mar 26 12:32:37 monitoring-pi kernel: [126762.492935] Swap cache stats: add 25738, delete 25735, find 226/3
02
Mar 26 12:32:37 monitoring-pi kernel: [126762.492939] Free swap = 0kB
Mar 26 12:32:37 monitoring-pi kernel: [126762.492944] Total swap = 102396kB
Mar 26 12:32:37 monitoring-pi kernel: [126762.492949] 242688 pages RAM
Mar 26 12:32:37 monitoring-pi kernel: [126762.492953] 0 pages HighMem/MovableOnly
Mar 26 12:32:37 monitoring-pi kernel: [126762.492958] 5326 pages reserved
Mar 26 12:32:37 monitoring-pi kernel: [126762.492966] 2048 pages cma reserved
Mar 26 12:32:37 monitoring-pi kernel: [126764.421946] python3 invoked oom-killer: gfp_mask=0x15080c0(GFP_KE
RNEL_ACCOUNT|__GFP_ZERO), nodemask=(null), order=1, oom_score_adj=0
Mar 26 12:32:37 monitoring-pi kernel: [126764.421959] python3 cpuset=/ mems_allowed=0
Mar 26 12:32:37 monitoring-pi kernel: [126764.421975] CPU: 3 PID: 530 Comm: python3 Tainted: G C O
4.14.79-v7+ #1159
Mar 26 12:32:37 monitoring-pi kernel: [126764.421977] Hardware name: BCM2835
Mar 26 12:32:37 monitoring-pi kernel: [126764.421998] [<8010ff30>] (unwind_backtrace) from [<8010c174>] (sh
ow_stack+0x20/0x24)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422008] [<8010c174>] (show_stack) from [<80788fa4>] (dump_sta
ck+0xd4/0x118)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422019] [<80788fa4>] (dump_stack) from [<802249ec>] (dump_hea
der+0xac/0x208)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422029] [<802249ec>] (dump_header) from [<80223d54>] (oom_kil
l_process+0x478/0x584)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422037] [<80223d54>] (oom_kill_process) from [<802246b4>] (ou
t_of_memory+0x124/0x334)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422047] [<802246b4>] (out_of_memory) from [<8022a18c>] (__all
oc_pages_nodemask+0x1060/0x11d8)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422057] [<8022a18c>] (__alloc_pages_nodemask) from [<8011b398
] (copy_process.part.5+0xec/0x1858)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422065] [<8011b398>] (copy_process.part.5) from [<8011cc94>]
(_do_fork+0xc8/0x408)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422071] [<8011cc94>] (do_fork) from [<8011d0f8>] (SyS_clone+
0x34/0x3c)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422080] [<8011d0f8>] (SyS_clone) from [<80108000>] (ret_fast
syscall+0x0/0x28)
Mar 26 12:32:37 monitoring-pi kernel: [126764.422084] Mem-Info:
Mar 26 12:32:37 monitoring-pi kernel: [126764.422096] active_anon:112151 inactive_anon:112232 isolated_anon
:0
Mar 26 12:32:37 monitoring-pi kernel: [126764.422096] active_file:58 inactive_file:59 isolated_file:0
Mar 26 12:32:37 monitoring-pi kernel: [126764.422096] unevictable:0 dirty:3 writeback:0 unstable:0
Mar 26 12:32:37 monitoring-pi kernel: [126764.422096] slab_reclaimable:1573 slab_unreclaimable:2173
Mar 26 12:32:37 monitoring-pi kernel: [126764.422096] mapped:695 shmem:198 pagetables:628 bounce:0
Mar 26 12:32:37 monitoring-pi kernel: [126764.422096] free:5709 free_pcp:0 free_cma:1697
Mar 26 12:32:37 monitoring-pi kernel: [126764.422104] Node 0 active_anon:448604kB inactive_anon:448928kB ac
tive_file:232kB inactive_file:236kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:2780kB dir
ty:12kB writeback:0kB shmem:792kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Mar 26 12:32:37 monitoring-pi kernel: [126764.422116] Normal free:22836kB min:16384kB low:20480kB high:2457
6kB active_anon:448604kB inactive_anon:448928kB active_file:668kB inactive_file:692kB unevictable:0kB write
pending:4kB present:970752kB managed:949448kB mlocked:0kB kernel_stack:792kB pagetables:2512kB bounce:0kB f
ree_pcp:0kB local_pcp:0kB free_cma:6788kB
Mar 26 12:32:37 monitoring-pi kernel: [126764.422117] lowmem_reserve[]: 0 0
Mar 26 12:32:37 monitoring-pi kernel: [126764.422125] Normal: 9204kB (UMEC) 3648kB (UMEC) 16716kB (UMEC)
3732kB (UMEC) 1864kB (UMEC) 8128kB (UMEC) 3256kB (U) 1512kB (E) 11024kB (E) 22048kB (EC) 14096kB (
C) = 23120kB
Mar 26 12:32:37 monitoring-pi kernel: [126764.422174] 397 total pagecache pages
Mar 26 12:32:37 monitoring-pi kernel: [126764.422178] 3 pages in swap cache
Mar 26 12:32:37 monitoring-pi kernel: [126764.422181] Swap cache stats: add 25738, delete 25735, find 226/3
02
Mar 26 12:32:37 monitoring-pi kernel: [126764.422184] Free swap = 0kB
Mar 26 12:32:37 monitoring-pi kernel: [126764.422186] Total swap = 102396kB
Mar 26 12:32:37 monitoring-pi kernel: [126764.422189] 242688 pages RAM
Mar 26 12:32:37 monitoring-pi kernel: [126764.422191] 0 pages HighMem/MovableOnly
Mar 26 12:32:37 monitoring-pi kernel: [126764.422193] 5326 pages reserved
Mar 26 12:32:37 monitoring-pi kernel: [126764.422196] 2048 pages cma reserved
Mar 26 12:32:37 monitoring-pi kernel: [126764.422199] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds
swapents oom_score_adj name
Mar 26 12:32:37 monitoring-pi kernel: [126764.422216] [ 105] 0 105 3199 205 9 0
62 0 systemd-journal
Mar 26 12:32:37 monitoring-pi kernel: [126764.422222] [ 125] 0 125 3586 15 8 0
144 -1000 systemd-udevd
Mar 26 12:32:37 monitoring-pi kernel: [126764.422229] [ 276] 100 276 4321 37 9 0
74 0 systemd-timesyn
Mar 26 12:32:37 monitoring-pi kernel: [126764.422234] [ 330] 0 330 516 0 4 0
24 0 rfcomm
Mar 26 12:32:37 monitoring-pi kernel: [126764.422240] [ 335] 0 335 5937 98 11 0
89 0 rsyslogd
Mar 26 12:32:37 monitoring-pi kernel: [126764.422246] [ 338] 105 338 1596 46 8 0
57 -900 dbus-daemon
Mar 26 12:32:37 monitoring-pi kernel: [126764.422251] [ 374] 0 374 1324 17 6 0
37 0 cron
Mar 26 12:32:37 monitoring-pi kernel: [126764.422258] [ 375] 0 375 1729 26 7 0
65 0 systemd-logind
Mar 26 12:32:37 monitoring-pi kernel: [126764.422264] [ 376] 65534 376 1324 4 7 0
56 0 thd
Mar 26 12:32:37 monitoring-pi kernel: [126764.422270] [ 380] 108 380 1601 0 6 0
85 0 avahi-daemon
Mar 26 12:32:37 monitoring-pi kernel: [126764.422275] [ 389] 108 389 1601 0 6 0
77 0 avahi-daemon
Mar 26 12:32:37 monitoring-pi kernel: [126764.422281] [ 433] 0 433 2542 17 9 0
130 0 wpa_supplicant
Mar 26 12:32:37 monitoring-pi kernel: [126764.422287] [ 457] 0 457 524 0 4 0
34 0 hciattach
Mar 26 12:32:37 monitoring-pi kernel: [126764.422293] [ 460] 0 460 1769 0 8 0
89 0 bluetoothd
Mar 26 12:32:37 monitoring-pi kernel: [126764.422299] [ 483] 0 483 737 0 6 0
100 0 dhcpcd
Mar 26 12:32:37 monitoring-pi kernel: [126764.422305] [ 484] 0 484 254830 223717 496 0
22873 0 python3
Mar 26 12:32:37 monitoring-pi kernel: [126764.422310] [ 496] 0 496 1049 0 6 0
35 0 agetty
Mar 26 12:32:37 monitoring-pi kernel: [126764.422316] [ 499] 0 499 2553 0 8 0
138 -1000 sshd
Mar 26 12:32:37 monitoring-pi kernel: [126764.422322] Out of memory: Kill process 484 (python3) score 911 o
r sacrifice child
Mar 26 12:32:37 monitoring-pi kernel: [126764.422338] Killed process 484 (python3) total-vm:1019320kB, anon
-rss:894868kB, file-rss:0kB, shmem-rss:0kB
Mar 26 12:32:37 monitoring-pi kernel: [126764.642532] oom_reaper: reaped process 484 (python3), now anon-rs
s:0kB, file-rss:2048kB, shmem-rss:0kB
Mar 26 12:32:37 monitoring-pi kernel: [126764.646377] device mon0 left promiscuous mode
Mar 26 12:32:37 monitoring-pi systemd[1]: wifi_monitor.service: Main process exited, code=killed, status=9/
KILL
Mar 26 12:32:37 monitoring-pi systemd[1]: wifi_monitor.service: Unit entered failed state.
Mar 26 12:32:37 monitoring-pi systemd[1]: wifi_monitor.service: Failed with result 'signal'.
Mar 26 12:32:51 monitoring-pi kernel: [126778.151918] Under-voltage detected! (0x00050005)
Mar 26 12:32:57 monitoring-pi kernel: [126784.391911] Voltage normalised (0x00000000)
Mar 26 12:34:51 monitoring-pi kernel: [126898.791909] Under-voltage detected! (0x00050005)
Mar 26 12:34:55 monitoring-pi kernel: [126902.951937] Voltage normalised (0x00000000)

[JamesH65]

Two obvious fauls in there

1. Your power supply/cabling is inadequate
2. Something is using up all the memory (Python?) and subsequently the OOM process killer is being activated.

[XECDesign]

Also, I don't think we support patched firmware.

[ghost]

Two obvious fauls in there

1. Your power supply/cabling is inadequate
2. Something is using up all the memory (Python?) and subsequently the OOM process killer is being activated.

Can I ask which sentences means your post in the pi log??

[ghost]

Also, I don't think we support patched firmware.

Can I ask what is the patched firmware?? I patched the Pi based on the Nexmon's instructions. It works well but suddenly it was stopped with the log..

[XECDesign]

Can I ask what is the patched firmware??

The 'what is nexmon' section of the page you linked earlier provides a good description. Anything you do that involves nexmon is not something that can be supported here.

[ghost]

Can I ask what is the patched firmware??

The 'what is nexmon' section of the page you linked earlier provides a good description. Anything you do that involves nexmon is not something that can be supported here.

I followed "Build patches for bcm43430a1 on the RPI3/Zero W or bcm434355c0 on the RPI3+ using Raspbian (recommended)". In addition, my python code run that the pi turn off the wireless (wlan0) and turn on the wlan0 in order to change the channel of WiFi per 20 seconds. Is it too much burden to the pi...??

[pelwell]

...using Raspbian (recommended)

Not recommended by Raspbian.

Anything you do that involves nexmon is not something that can be supported here.

Read and understand that sentence.

[ghost]

...using Raspbian (recommended)

Not recommended by Raspbian.

Anything you do that involves nexmon is not something that can be supported here.

Read and understand that sentence.

I understood that now. Thanks for your comments!!!