INFO: mock.py version 1.4.3 starting (python version = 3.6.2)...
Start: init plugins
INFO: selinux disabled
Finish: init plugins
Start: run
INFO: Start(/var/tmp/grepcidr/grepcidr-2.0-1.fc26.art.src.rpm)  Config(suse-13.1-i586)
Start: clean chroot
ERROR: Exception(/var/tmp/grepcidr/grepcidr-2.0-1.fc26.art.src.rpm) Config(suse-13.1-i586) 0 minutes 0 seconds
INFO: Results and/or logs in: /var/lib/mock/suse-13.1-i586/result
ERROR: [Errno 1] Operation not permitted: '/var/lib/mock/suse-13.1-i586/root/sys/kernel/fscache'
ERROR: The most common cause for this error is trying to run /usr/libexec/mock/mock as an unprivileged user.
ERROR: You should not run /usr/libexec/mock/mock directly.