I’ve been enjoying running QuickBox on a Hetzner server for nearly a month now, but my server has been unresponsive multiple times within the last 24 hours. Most services no longer respond (sFTP, rTorrent, even SSH). The box was installed using Ubuntu 16.04.
Can anyone help me troubleshoot this problem? I found some odd looking errors in the syslog, not sure if it’s related:
Dec 26 23:54:12 Oslo kernel: [38619.111808] NMI watchdog: BUG: soft lockup - CPU#5 stuck for 22s! [kswapd0:83]
Dec 26 23:54:20 Oslo kernel: [38647.113691] NMI watchdog: BUG: soft lockup - CPU#5 stuck for 22s! [kswapd0:83]
Dec 26 23:54:49 Oslo kernel: [38675.115574] NMI watchdog: BUG: soft lockup - CPU#5 stuck for 23s! [kswapd0:83]
This is the output from df -h:
Filesystem Size Used Avail Use% Mounted on udev 7.8G 0 7.8G 0% /dev tmpfs 1.6G 13M 1.6G 1% /run /dev/mapper/vg0-root 5.4T 1.9T 3.3T 38% / tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup /dev/md0 488M 115M 348M 25% /boot /dev/mapper/vg0-tmp 20G 33M 20G 1% /tmp tmpfs 1.6G 0 1.6G 0% /run/user/1000
A hard reboot operated from the console fixes the problem, until it starts acting up again.