I have a watchdog installed on my beaglebone running debian with config :watchdog-device    = /dev/watchdogadmin              = alarm@system.cominterval           = 10realtime           = Truepriority           = 1logtick            = 1log-dir            = /var/log/watchdogmax-load-1         = 7max-load-5         = 6max-load-15        = 4Now the system load went too high and in the syslog I see that the watchdog performed a reboot, only after a few seconds nothing happened anymore on the system and the device wasn't accessible anymore. After rebooting it the device was back online. What is the reason why the reboot did not succeed? I also don't understand why the system gets an IP Address from DHCP when reboot is performed? Find here the syslog:Jun 27 18:32:23 system14 watchdog[806]: loadavg 8 4 2 is higher than the given threshold 7 6 4!Jun 27 18:32:23 system14 watchdog[806]: /usr/lib/sendmail does not exist or is not executable (errno = 2)Jun 27 18:32:23 system14 watchdog[806]: shutting down the system because of error -3Jun 27 18:32:24 system14 dhclient: Internet Systems Consortium DHCP Client 4.2.2Jun 27 18:32:24 system14 dhclient: Copyright 2004-2011 Internet Systems Consortium.Jun 27 18:32:24 system14 dhclient: All rights reserved.Jun 27 18:32:24 system14 dhclient: For info, please visit https://www.isc.org/software/dhcp/Jun 27 18:32:24 system14 dhclient:Jun 27 18:32:24 system14 dhclient: Listening on LPF/eth0/68:9e:19:85:dd:9cJun 27 18:32:24 system14 dhclient: Sending on   LPF/eth0/68:9e:19:85:dd:9cJun 27 18:32:24 system14 dhclient: Sending on   Socket/fallbackJun 27 18:32:24 system14 dhclient: DHCPRELEASE on eth0 to 10.2.14.1 port 67Jun 27 18:32:25 system14 avahi-daemon[672]: Withdrawing address record for 10.2.14.2 on eth0.Jun 27 18:32:25 system14 avahi-daemon[672]: Interface eth0.IPv6 no longer relevant for mDNS.Jun 27 18:32:25 system14 avahi-daemon[672]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::6a9e:19ff:fe85:dd9c.Jun 27 18:32:25 system14 avahi-daemon[672]: Interface eth0.IPv4 no longer relevant for mDNS.Jun 27 18:32:25 system14 avahi-daemon[672]: Leaving mDNS multicast group on interface eth0.IPv4 with address 169.254.242.10.Jun 27 18:32:25 system14 avahi-daemon[672]: Withdrawing address record for fe80::6a9e:19ff:fe85:dd9c on eth0.Jun 27 18:32:25 system14 avahi-daemon[672]: Withdrawing address record for 169.254.242.10 on eth0.Jun 27 18:32:25 system14 kernel: [61273.385091] net eth0: initializing cpsw version 1.12 (0)Jun 27 18:32:25 system14 kernel: [61273.387698] net eth0: phy found : id is : 0x7c0f1Jun 27 18:32:25 system14 kernel: [61273.387737] libphy: PHY 4a101000.mdio:01 not foundJun 27 18:32:25 system14 kernel: [61273.392833] net eth0: phy 4a101000.mdio:01 not found on slave 1Jun 27 18:32:25 system14 avahi-daemon[672]: Joining mDNS multicast group on interface eth0.IPv4 with address 169.254.242.10.Jun 27 18:32:25 system14 kernel: [61273.407011] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not readyJun 27 18:32:25 system14 avahi-daemon[672]: New relevant interface eth0.IPv4 for mDNS.Jun 27 18:32:25 system14 avahi-daemon[672]: Registering new address record for 169.254.242.10 on eth0.IPv4.Jun 27 18:32:25 system14 avahi-daemon[672]: Interface eth0.IPv4 no longer relevant for mDNS.Jun 27 18:32:25 system14 avahi-daemon[672]: Leaving mDNS multicast group on interface eth0.IPv4 with address 169.254.242.10.Jun 27 18:32:25 system14 avahi-daemon[672]: Withdrawing address record for 169.254.242.10 on eth0.Jun 27 18:32:25 system14 dhclient: Internet Systems Consortium DHCP Client 4.2.2Jun 27 18:32:25 system14 dhclient: Copyright 2004-2011 Internet Systems Consortium.Jun 27 18:32:25 system14 dhclient: All rights reserved.Jun 27 18:32:25 system14 dhclient: For info, please visit https://www.isc.org/software/dhcp/Jun 27 18:32:25 system14 dhclient:Jun 27 18:32:25 system14 dhclient: Listening on LPF/eth0/68:9e:19:85:dd:9cJun 27 18:32:25 system14 dhclient: Sending on   LPF/eth0/68:9e:19:85:dd:9cJun 27 18:32:25 system14 dhclient: Sending on   Socket/fallbackJun 27 18:32:25 system14 dhclient: DHCPRELEASE on eth0 to 10.2.14.1 port 67Jun 27 18:32:25 system14 dhclient: send_packet: Network is unreachableJun 27 18:32:25 system14 dhclient: send_packet: please consult README file regarding broadcast address.Jun 27 18:32:25 system14 kernel: [61273.903064] net eth0: initializing cpsw version 1.12 (0)Jun 27 18:32:25 system14 kernel: [61273.906075] net eth0: phy found : id is : 0x7c0f1Jun 27 18:32:25 system14 avahi-daemon[672]: Joining mDNS multicast group on interface eth0.IPv4 with address 169.254.242.10.Jun 27 18:32:25 system14 avahi-daemon[672]: New relevant interface eth0.IPv4 for mDNS.Jun 27 18:32:25 system14 avahi-daemon[672]: Registering new address record for 169.254.242.10 on eth0.IPv4.Jun 27 18:32:25 system14 kernel: [61273.906103] libphy: PHY 4a101000.mdio:01 not foundJun 27 18:32:25 system14 kernel: [61273.911199] net eth0: phy 4a101000.mdio:01 not found on slave 1Jun 27 18:32:25 system14 kernel: [61273.924206] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not readyJun 27 18:32:27 system14 kernel: [61275.913814] libphy: 4a101000.mdio:00 - Link is Up - 100/FullJun 27 18:32:27 system14 kernel: [61275.913880] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes readyJun 27 18:32:27 system14 dhclient: Internet Systems Consortium DHCP Client 4.2.2Jun 27 18:32:27 system14 dhclient: Copyright 2004-2011 Internet Systems Consortium.Jun 27 18:32:27 system14 dhclient: All rights reserved.Jun 27 18:32:27 system14 dhclient: For info, please visit https://www.isc.org/software/dhcp/Jun 27 18:32:27 system14 dhclient:Jun 27 18:32:28 system14 dhclient: Listening on LPF/eth0/68:9e:19:85:dd:9cJun 27 18:32:28 system14 dhclient: Sending on   LPF/eth0/68:9e:19:85:dd:9cJun 27 18:32:28 system14 dhclient: Sending on   Socket/fallbackJun 27 18:32:28 system14 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8Jun 27 18:32:28 system14 dhclient: DHCPREQUEST on eth0 to 255.255.255.255 port 67Jun 27 18:32:28 system14 dhclient: DHCPOFFER from 10.2.14.1Jun 27 18:32:28 system14 dhclient: DHCPACK from 10.2.14.1Jun 27 18:32:28 system14 avahi-daemon[672]: Registering new address record for 10.2.14.186 on eth0.IPv4.Jun 27 18:32:28 system14 dhclient: bound to 10.2.14.186 -- renewal in 21373 seconds.Jun 27 18:32:28 system14 avahi-daemon[672]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::6a9e:19ff:fe85:dd9c.Jun 27 18:32:28 system14 avahi-daemon[672]: New relevant interface eth0.IPv6 for mDNS.Jun 27 18:32:28 system14 avahi-daemon[672]: Registering new address record for fe80::6a9e:19ff:fe85:dd9c on eth0.*.Jun 27 18:32:29 system14 ntpdate[14505]: the NTP socket is in use, exitingJun 27 18:32:34 system14 kernel: imklog 5.8.11, log source = /proc/kmsg started.Jun 27 18:32:34 system14 rsyslogd: [origin software=rsyslogd swVersion=5.8.11 x-pid=14554 x-info=http://www.rsyslog.com] startJun 27 18:32:34 system14 wd_keepalive[783]: stopping watchdog keepalive daemon (5.12)Jun 27 18:32:34 system14 avahi-daemon[672]: Got SIGTERM, quitting.Jun 27 18:32:34 system14 acpid: exitingJun 27 18:32:34 system14 udhcpd[1163]: Received SIGTERMJun 27 18:32:34 system14 avahi-daemon[672]: Leaving mDNS multicast group on interface usb0.IPv4 with address 192.168.7.2.Jun 27 18:32:34 system14 avahi-daemon[672]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::6a9e:19ff:fe85:dd9c.Jun 27 18:32:34 system14 monit[897]: monit daemon with pid [897] killedJun 27 18:32:34 system14 avahi-daemon[672]: Leaving mDNS multicast group on interface eth0.IPv4 with address 169.254.242.10.Jun 27 18:32:34 system14 monit[897]: 'system_system14' Monit stoppedJun 27 18:32:34 system14 avahi-daemon[672]: avahi-daemon 0.6.31 exiting.Jun 27 18:32:34 system14 systemd[1]: Cannot add dependency job for unit cloud9.socket, ignoring: Unit cloud9.socket failed to load: No such file or directory. See system logs and 'systemctl status cloud9.socket' for details.Jun 27 18:32:34 system14 systemd[1]: serial-getty@ttyO0.service holdoff time over, scheduling restart.Jun 27 18:32:34 system14 nginx[14548]: nginx: [error] open() /var/run/nginx.pid failed (2: No such file or directory)Jun 27 18:32:34 system14 systemd[1]: nginx.service: control process exited, code=exited status=1Jun 27 18:32:34 system14 systemd[1]: Unit nginx.service entered failed state.
Watchdog shutdown freeze system
debian;reboot;freeze;watchdog;beagleboneblack