Comment 10 for bug 1656528

I attached the strace log.

Is there a chance it's related to this?

http://unix.stackexchange.com/questions/285529/internet-stops-working-failed-to-add-run-systemd-ask-password-to-directory-wa

https://bugzilla.redhat.com/show_bug.cgi?id=894483

After I updated /etc/ssh/sshd_config I got an interesting error:
$ sudo service ssh restart
Failed to add /run/systemd/ask-password to directory watch: No space left on device

...which leads me to wonder if the Crashplan back-up service is the most likely culprit. "It uses many inotify watches and, eventually, eats them all up."