I have a Raspberry Pi 3. I use it as a FTP-server provisionally.
Every 2/3 days it crashes because of a problem with the NTP. I have cut the power to reboot it.
I have the system logs which show the commands executed before the crash. But I am unable to understand where the problem is.
This is the first log (24 January):
Jan 24 19:17:08 raspberrypi systemd[1]: Starting Hostname Service...
Jan 24 19:17:08 raspberrypi dhcpcd[657]: eth0: ADV fdc4:5833:f1d0::df2/128 from fe80::16cc:20ff:feb0:d748
Jan 24 19:17:08 raspberrypi dhcpcd[657]: eth0: REPLY6 received from fe80::16cc:20ff:feb0:d748
Jan 24 19:17:08 raspberrypi dhcpcd[657]: eth0: adding address fdc4:5833:f1d0::df2/128
Jan 24 19:17:08 raspberrypi dhcpcd[657]: eth0: renew in 21600 seconds, rebind in 34560 seconds
Jan 24 19:17:08 raspberrypi systemd-hostnamed[702]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
Jan 24 19:17:08 raspberrypi dbus[404]: [system] Successfully activated service 'org.freedesktop.hostname1'
Jan 24 19:17:08 raspberrypi systemd[1]: Started Hostname Service.
Jan 24 19:17:09 raspberrypi avahi-daemon[394]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::745d:a1fd:6899:6691.
Jan 24 19:17:09 raspberrypi avahi-daemon[394]: Joining mDNS multicast group on interface eth0.IPv6 with address fdc4:5833:f1d0:0:8be4:8659:f462:8495.
Jan 24 19:17:09 raspberrypi avahi-daemon[394]: Registering new address record for fdc4:5833:f1d0:0:8be4:8659:f462:8495 on eth0.*.
Jan 24 19:17:09 raspberrypi avahi-daemon[394]: Withdrawing address record for fe80::745d:a1fd:6899:6691 on eth0.
Jan 24 19:17:10 raspberrypi avahi-daemon[394]: Registering new address record for fdc4:5833:f1d0::df2 on eth0.*.
Jan 24 19:17:11 raspberrypi ntpd[682]: Listen normally on 5 eth0 fdc4:5833:f1d0::df2 UDP 123
Jan 24 19:17:11 raspberrypi ntpd[682]: Listen normally on 6 eth0 fdc4:5833:f1d0:0:8be4:8659:f462:8495 UDP 123
Jan 24 19:17:11 raspberrypi ntpd[682]: Listen normally on 7 eth0 fe80::745d:a1fd:6899:6691 UDP 123
Jan 24 19:17:11 raspberrypi ntpd[682]: peers refreshed
And this is the second log (27 January):
Jan 27 09:17:08 raspberrypi systemd[1]: Started Hostname Service.
Jan 27 09:17:08 raspberrypi dhcpcd[654]: eth0: DHCPv6 REPLY: Not On Link
Jan 27 09:17:08 raspberrypi dhcpcd[654]: eth0: soliciting a DHCPv6 lease
Jan 27 09:17:09 raspberrypi avahi-daemon[391]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::745d:a1fd:6899:6691.
Jan 27 09:17:09 raspberrypi avahi-daemon[391]: Joining mDNS multicast group on interface eth0.IPv6 with address fdc4:5833:f1d0:0:8be4:8659:f462:8495.
Jan 27 09:17:09 raspberrypi avahi-daemon[391]: Registering new address record for fdc4:5833:f1d0:0:8be4:8659:f462:8495 on eth0.*.
Jan 27 09:17:09 raspberrypi avahi-daemon[391]: Withdrawing address record for fe80::745d:a1fd:6899:6691 on eth0.
Jan 27 09:17:09 raspberrypi dhcpcd[654]: eth0: ADV fdc4:5833:f1d0::df2/128 from fe80::16cc:20ff:feb0:d748
Jan 27 09:17:09 raspberrypi dhcpcd[654]: eth0: REPLY6 received from fe80::16cc:20ff:feb0:d748
Jan 27 09:17:09 raspberrypi dhcpcd[654]: eth0: adding address fdc4:5833:f1d0::df2/128
Jan 27 09:17:09 raspberrypi dhcpcd[654]: eth0: renew in 21600 seconds, rebind in 34560 seconds
Jan 27 09:17:10 raspberrypi ntpd[679]: Listen normally on 5 eth0 fdc4:5833:f1d0:0:8be4:8659:f462:8495 UDP 123
Jan 27 09:17:10 raspberrypi ntpd[679]: Listen normally on 6 eth0 fe80::745d:a1fd:6899:6691 UDP 123
Jan 27 09:17:10 raspberrypi ntpd[679]: peers refreshed
Jan 27 09:17:10 raspberrypi avahi-daemon[391]: Registering new address record for fdc4:5833:f1d0::df2 on eth0.*.
Jan 27 09:17:12 raspberrypi ntpd[679]: Listen normally on 7 eth0 fdc4:5833:f1d0::df2 UDP 123
Jan 27 09:17:12 raspberrypi ntpd[679]: peers refreshed
I also have the whole log if somebody wants it.