This ioprocess build failed with ci related issue: http://jenkins.ovirt.org/job/ioprocess_master_build-artifacts-el7-x86_64/1/ 12:18:34 + mounts=($(mount | awk '{print $3}' | grep "$mock_root")) 12:18:34 ++ mount 12:18:34 ++ awk '{print $3}' 12:18:34 ++ grep /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b 12:18:34 + [[ -n /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc ]] 12:18:34 + echo 'Found mounted dirs inside the chroot /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b.' 'Trying to umount.' 12:18:34 Found mounted dirs inside the chroot /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b. Trying to umount. 12:18:34 + for mount in '"${mounts[@]}"' 12:18:34 + sudo umount /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc 12:18:34 umount: /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc: target is busy. 12:18:34 (In some cases useful info about processes that use 12:18:34 the device is found by lsof(8) or fuser(1)) 12:18:34 + echo 'ERROR: Failed to umount /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc.' 12:18:34 ERROR: Failed to umount /var/lib/mock/fedora-22-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/proc. We should check why the mountpoint is busy, but a quick fix may be using the --lazy option: umount --lazy /mountpoint Nir