parasense added a new comment to an issue you are following:
``
So I ran the systemd-nspawn manually and got the same error:
<code>
[root@bodhi-backend01 ~][PROD]# /usr/bin/systemd-nspawn -q -M
0060dfca002248b8ad3ac734bf76fd53 -D
/var/lib/mock/fedora-25-updates-testing-x86_64/root
--setenv=HOME=/builddir --setenv=TERM=vt100
--setenv=SHELL=/bin/bash --setenv=PS1='<mock-chroot>
\s-\v\$' --setenv=LANG=en_US.UTF-8
--setenv=PATH=/usr/bin:/bin:/usr/sbin:/sbin
--setenv=PROMPT_COMMAND='printf "\033]0;<mock-chroot>\007"'
--setenv=HOSTNAME=mock /bin/sh -c
"/usr/bin/rpm-ostree compose tree --workdir-tmpfs
--repo=/srv/fedora-atomic/25/x86_64/docker-host
/var/tmp/tmpfRsYiP/fedora-atomic.git/treefile.json"
Can't create loopback device
error: bwrap test failed, see
<
https://github.com/projectatomic/rpm-ostree/pull/429>: Executing bwrap(true): Child
process exited with code 1
</code>
The loop module was not loaded, so loaded that...
<code>
[root@bodhi-backend01 ~][PROD]# modprobe loop
[root@bodhi-backend01 ~][PROD]# lsmod
Module Size Used by
loop 28672 0
</code>
The systemd-nspawn had the same result, so I ran a manual loop-dev test case:
<code>
[root@bodhi-backend01 ~][PROD]# truncate -s 100M /tmp/foo.parasense
[root@bodhi-backend01 ~][PROD]# losetup /tmp/foo.parasense
losetup: /tmp/foo.parasense: failed to use device: No such device
</code>
``
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https://pagure.io/releng/issue/6602