CentOS 7: df started to hang

Solution 1:

Started having this issue on few servers after 7.5 upgrade. A quick reboot will fix the issue but I couldn't afford rebooting the production hosts, after hours of troubleshooting following fixed it for me.

systemctl restart proc-sys-fs-binfmt_misc.mount

Solution 2:

i have the same issue on lots of servers

quick & dirty fix is

yum -y reinstall systemd

Solution 3:

The solution turned out to be an odd one. A new issue manifested itself in the form of certain network routes failing to resolve. In research, it was dicovered that the underlying host force updated routing tables, updating kernel. Effectively, the issue was solved with a reboot, and re-entry of correct routing tables.