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Co kilka tygodni zawiesza mi się Raspberry Pi, przestaje być widoczne przez sieć. Po podłączeniu monitora nic nie widać, nie reaguje na klawiaturę. Wtedy resetuję poprzez krótkie odłączenie zasilania. Co może być przyczyną? Jak patrzę w sysloga, to mam wrażenie, że winne jest jakieś zaplanowane w cronie uruchomienie fsck. Poniżej przykładowy log. Działanie maliny kończy się na:
Oct 21 08:42:51 raspberrypi rsyslogd: [origin software="rsyslogd" swVersion="8.2102.0" x-pid="385" x-info="https://www.rsyslog.com"] start
Potem jest reset. Wygląda jakby wykonany został w tej samej sekundzie, ale w rzeczywistości malina pozostawała w stanie zawieszenia przez ponad tydzień, tylko startując wzięła ostatni znnay czas.
#raspberrypi #linux

Oct 21 08:17:01 raspberrypi CRON[30645]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Oct 21 08:36:11 raspberrypi squid[952]: Logfile: opening log stdio:/var/spool/squid/netdb.state
Oct 21 08:36:11 raspberrypi squid[952]: Logfile: closing log stdio:/var/spool/squid/netdb.state
Oct 21 08:36:11 raspberrypi squid[952]: NETDB state saved; 0 entries, 0 msec
Oct 21 08:42:51 raspberrypi fake-hwclock[132]: pią, 21 paź 2022, 06:17:01 UTC
Oct 21 08:42:51 raspberrypi systemd-fsck[150]: e2fsck 1.46.2 (28-Feb-2021)
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Coldplug All udev Devices.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Helper to synchronize boot up for ifupdown...
Oct 21 08:42:51 raspberrypi systemd-fsck[150]: rootfs: czysty, 141599/6837312 plików, 4189657/29292918 bloków
Oct 21 08:42:51 raspberrypi systemd[1]: Finished File System Check on Root Device.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Helper to synchronize boot up for ifupdown.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Remount Root and Kernel File Systems...
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Set the console keyboard layout.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Remount Root and Kernel File Systems.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Rebuild Hardware Database being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Flush Journal to Persistent Storage...
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Platform Persistent Storage Archival being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Load/Save Random Seed...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Create System Users...
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Load/Save Random Seed.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in First Boot Complete being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Create System Users.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Create Static Device Nodes in /dev...
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Create Static Device Nodes in /dev.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Local File Systems (Pre).
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Rule-based Manager for Device Events and Files...
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Flush Journal to Persistent Storage.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Rule-based Manager for Device Events and Files.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Show Plymouth Boot Screen...
Oct 21 08:42:51 raspberrypi systemd[1]: Received SIGRTMIN+20 from PID 176 (plymouthd).
Oct 21 08:42:51 raspberrypi systemd[1]: Started Show Plymouth Boot Screen.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Dispatch Password Requests to Console Directory Watch being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Forward Password Requests to Plymouth Directory Watch.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Local Encrypted Volumes.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Paths.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Dispatch Password Requests to Console Directory Watch being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Huge Pages File System being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Set Up Additional Binary Formats being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Rebuild Hardware Database being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Platform Persistent Storage Archival being skipped.
Oct 21 08:42:51 raspberrypi mtp-probe: checking bus 1, device 5: "/sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.3"
Oct 21 08:42:51 raspberrypi mtp-probe: bus: 1, device: 5 was not an MTP device
Oct 21 08:42:51 raspberrypi mtp-probe: checking bus 1, device 4: "/sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.1"
Oct 21 08:42:51 raspberrypi mtp-probe: bus: 1, device: 4 was not an MTP device
Oct 21 08:42:51 raspberrypi systemd-udevd[173]: Using default interface naming scheme 'v247'.
Oct 21 08:42:51 raspberrypi systemd[1]: Found device SA400S37120G boot.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting File System Check on /dev/disk/by-partuuid/acb1f412-01...
Oct 21 08:42:51 raspberrypi systemd[1]: Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Load/Save RF Kill Switch Status...
Oct 21 08:42:51 raspberrypi systemd-udevd[167]: Using default interface naming scheme 'v247'.
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: fsck.fat 4.2 (2021-01-31)
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: There are differences between boot sector and its backup.
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: This is mostly harmless. Differences: (offset:original/backup)
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: 65:01/00
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: Not automatically fixing this.
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: Dirty bit is set. Fs was not properly unmounted and some data may be corrupt.
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: Automatically removing dirty bit.
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: * Filesystem was changed *
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: Writing changes.
Oct 21 08:42:51 raspberrypi systemd-fsck[246]: /dev/sda1: 312 files, 52514/86467 clusters
Oct 21 08:42:51 raspberrypi systemd[1]: Started Load/Save RF Kill Switch Status.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Dispatch Password Requests to Console Directory Watch being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Huge Pages File System being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Set Up Additional Binary Formats being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Rebuild Hardware Database being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Platform Persistent Storage Archival being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished File System Check on /dev/disk/by-partuuid/acb1f412-01.
Oct 21 08:42:51 raspberrypi systemd[1]: Mounting /boot...
Oct 21 08:42:51 raspberrypi systemd[1]: Mounted /boot.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Local File Systems.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Set console font and keymap...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Raise network interfaces...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Preprocess NFS configuration...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Tell Plymouth To Write Out Runtime Data...
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Store a System Token in an EFI Variable being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Commit a transient machine-id on disk being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Create Volatile Files and Directories...
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Set console font and keymap.
Oct 21 08:42:51 raspberrypi systemd[1]: nfs-config.service: Succeeded.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Preprocess NFS configuration.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in RPC security service for NFS client and server being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in RPC security service for NFS server being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target NFS client services.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Remote File Systems (Pre).
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Remote File Systems.
Oct 21 08:42:51 raspberrypi systemd[1]: Received SIGRTMIN+20 from PID 176 (plymouthd).
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Tell Plymouth To Write Out Runtime Data.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Create Volatile Files and Directories.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Network Time Synchronization...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Update UTMP about System Boot/Shutdown...
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Update UTMP about System Boot/Shutdown.
Oct 21 08:42:51 raspberrypi systemd-timesyncd[336]: System clock time unset or jumped backwards, restoring from recorded timestamp: Fri 2022-10-21 08:42:50 CEST
Oct 21 08:42:51 raspberrypi systemd[1]: Started Network Time Synchronization.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target System Initialization.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Daily Cleanup of Temporary Directories.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target System Time Set.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target System Time Synchronized.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Daily apt download activities.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Daily apt upgrade and clean activities.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Periodic ext4 Online Metadata Check for All Filesystems.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Daily exim4-base housekeeping.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Daily rotation of log files.
Oct 21 08:42:51 raspberrypi systemd[1]: Started Daily man-db regeneration.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Timers.
Oct 21 08:42:51 raspberrypi systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Oct 21 08:42:51 raspberrypi systemd[1]: Listening on D-Bus System Message Bus Socket.
Oct 21 08:42:51 raspberrypi systemd[1]: Listening on PC/SC Smart Card Daemon Activation Socket.
Oct 21 08:42:51 raspberrypi systemd[1]: Listening on triggerhappy.socket.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Sockets.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Basic System.
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Manage Sound Card State (restore and store) being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Save/Restore Sound Card State...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Avahi mDNS/DNS-SD Stack...
Oct 21 08:42:51 raspberrypi systemd[1]: Started Regular background program processing daemon.
Oct 21 08:42:51 raspberrypi systemd[1]: Started D-Bus System Message Bus.
Oct 21 08:42:51 raspberrypi cron[362]: (CRON) INFO (pidfile fd = 3)
Oct 21 08:42:51 raspberrypi systemd[1]: Starting dphys-swapfile - set up, mount/unmount, and delete a swap file...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Remove Stale Online ext4 Metadata Check Snapshots...
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in getty on tty2-tty6 if dbus and logind are not available being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Configure Bluetooth Modems connected by UART...
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Copy user wpa_supplicant.conf being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting DHCP Client Daemon...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting LSB: Switch to ondemand cpu governor (unless shift key is pressed)...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting LSB: rng-tools (Debian variant)...
Oct 21 08:42:51 raspberrypi cron[362]: (CRON) INFO (Running @reboot jobs)
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Check for Raspberry Pi EEPROM updates...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting System Logging Service...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting Self Monitoring and Reporting Technology (SMART) Daemon...
Oct 21 08:42:51 raspberrypi systemd[1]: Condition check resulted in Turn on SSH if /boot/ssh is present being skipped.
Oct 21 08:42:51 raspberrypi systemd[1]: Starting LSB: Start or stop stunnel 4.x (TLS tunnel for network daemons)...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting User Login Management...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting triggerhappy global hotkey daemon...
Oct 21 08:42:51 raspberrypi systemd[1]: Starting WPA supplicant...
Oct 21 08:42:51 raspberrypi avahi-daemon[361]: Found user 'avahi' (UID 108) and group 'avahi' (GID 112).
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Save/Restore Sound Card State.
Oct 21 08:42:51 raspberrypi systemd[1]: Reached target Sound Card.
Oct 21 08:42:51 raspberrypi avahi-daemon[361]: Successfully dropped root privileges.
Oct 21 08:42:51 raspberrypi avahi-daemon[361]: avahi-daemon 0.8 starting up.
Oct 21 08:42:51 raspberrypi rpi-eeprom-update[383]: This tool only works with a Raspberry Pi 4
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Check for Raspberry Pi EEPROM updates.
Oct 21 08:42:51 raspberrypi dhcpcd[374]: dev: loaded udev
Oct 21 08:42:51 raspberrypi thd[410]: Found socket passed from systemd
Oct 21 08:42:51 raspberrypi systemd[1]: Started triggerhappy global hotkey daemon.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Raise network interfaces.
Oct 21 08:42:51 raspberrypi raspi-config[375]: Checking if shift key is held down:
Oct 21 08:42:51 raspberrypi raspi-config[479]: Error opening '/dev/input/event*': No such file or directory
Oct 21 08:42:51 raspberrypi raspi-config[375]: No. Switching to ondemand scaling governor.
Oct 21 08:42:51 raspberrypi systemd[1]: Started LSB: Switch to ondemand cpu governor (unless shift key is pressed).
Oct 21 08:42:51 raspberrypi dphys-swapfile[366]: want /var/swap=100MByte, checking existing: keeping it
Oct 21 08:42:51 raspberrypi systemd[1]: e2scrub_reap.service: Succeeded.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished Remove Stale Online ext4 Metadata Check Snapshots.
Oct 21 08:42:51 raspberrypi systemd[1]: Finished dphys-swapfile - set up, mount/unmount, and delete a swap file.
Oct 21 08:42:51 raspberrypi rngd[492]: rngd 2.2 starting up...
Oct 21 08:42:51 raspberrypi systemd[1]: Started LSB: rng-tools (Debian variant).
Oct 21 08:42:51 raspberrypi rngd[492]: entropy feed to the kernel ready
Oct 21 08:42:51 raspberrypi systemd[1]: Started System Logging Service.
Oct 21 08:42:51 raspberrypi rsyslogd: imuxsock: Acquired UNIX socket '/run/systemd/journal/syslog' (fd 3) from systemd. [v8.2102.0]
Oct 21 08:42:51 raspberrypi rsyslogd: [origin software="rsyslogd" swVersion="8.2102.0" x-pid="385" x-info="https://www.rsyslog.com"] start
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Booting Linux on physical CPU 0x0
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Linux version 5.15.61-v7+ (dom@buildbot) (arm-linux-gnueabihf-gcc-8 (Ubuntu/Linaro 8.4.0-3ubuntu1) 8.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #1579 SMP Fri Aug 26 11:10:59 BST 2022
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] CPU: div instructions available: patching division code
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] OF: fdt: Machine model: Raspberry Pi 3 Model B Plus Rev 1.3
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] random: crng init done
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Memory policy: Data cache writealloc
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Reserved memory: created CMA memory pool at 0x37400000, size 64 MiB
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Zone ranges:
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] DMA [mem 0x0000000000000000-0x000000003b3fffff]
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Normal empty
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Movable zone start for each node
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Early memory node ranges
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] node 0: [mem 0x0000000000000000-0x000000003b3fffff]
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000003b3fffff]
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] percpu: Embedded 16 pages/cpu s35724 r8192 d21620 u65536
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] pcpu-alloc: s35724 r8192 d21620 u65536 alloc=16*4096
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 240555
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Kernel command line: coherentpool=1M 8250.nruarts=0 sndbcm2835.enablecompatalsa=0 sndbcm2835.enablehdmi=1 bcm2708fb.fbwidth=656 bcm2708fb.fbheight=416 bcm2708fb.fbswap=1 vcmem.membase=0x3ec00000 vcmem.memsize=0x40000000 dwcotg.lpmenable=0 console=ttyS0,115200 console=tty1 root=PARTUUID=acb1f412-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Kernel parameter elevator= does not have any effect anymore.
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Please use sysfs to set IO scheduler for individual devices.
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Memory: 878092K/970752K available (10240K kernel code, 1337K rwdata, 3076K rodata, 1024K init, 569K bss, 27124K reserved, 65536K cma-reserved)
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] ftrace: allocating 33298 entries in 98 pages
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] ftrace: allocated 98 pages with 3 groups
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] trace event string verifier disabled
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] rcu: Hierarchical RCU implementation.
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Rude variant of Tasks RCU enabled.
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] Tracing variant of Tasks RCU enabled.
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] NRIRQS: 16, nrirqs: 16, preallocated irqs: 16
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] archtimer: cp15 timer(s) running at 19.20MHz (phys).
Oct 21 08:42:51 raspberrypi kernel: [ 0.000000] clocksource: arch
syscounter: mask: 0xffffffffffffff maxcycles: 0x46d987e47, maxidlens: 440795202767 ns
Oct 21 08:42:51 raspberrypi kernel: [ 0.000001] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
Oct 21 08:42:51 raspberrypi kernel: [ 0.000025] Switching to timer-based delay loop, resolution
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