Comment 16 for bug 1551854

Interesting. I removed the /sys/kernel/debug mount and containers seem to start up just fine:

c@mawhrin-skel:~$ grep kernel/debug /usr/share/lxc/config/ubuntu.common.conf
# lxc.mount.entry = /sys/kernel/debug sys/kernel/debug none bind,optional 0 0
c@mawhrin-skel:~$ lxc launch ubuntu-trusty t2
Creating t2
Starting t2
c@mawhrin-skel:~$ lxc exec t2 -- ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 4 19:02 ? 00:00:00 /sbin/init
root 453 1 0 19:02 ? 00:00:00 upstart-socket-bridge --daemon
root 1507 1 0 19:02 ? 00:00:00 upstart-udev-bridge --daemon
root 1513 1 0 19:02 ? 00:00:00 /lib/systemd/systemd-udevd --dae
root 1583 1 0 19:02 ? 00:00:00 dhclient -1 -v -pf /run/dhclient
root 1606 1 0 19:02 ? 00:00:00 /bin/sh /etc/network/if-up.d/ntp
root 1610 1606 0 19:02 ? 00:00:00 lockfile-touch /var/lock/ntpdate
root 1619 1606 0 19:02 ? 00:00:00 /usr/sbin/ntpdate -s ntp.ubuntu.
root 1772 1 0 19:02 ? 00:00:00 /bin/sh /etc/network/if-up.d/ntp
message+ 1773 1 0 19:02 ? 00:00:00 dbus-daemon --system --fork
root 1775 1772 0 19:02 ? 00:00:00 lockfile-create /var/lock/ntpdat
root 1812 1 0 19:02 ? 00:00:00 /lib/systemd/systemd-logind
root 1864 1 0 19:02 ? 00:00:00 cron
daemon 1866 1 0 19:02 ? 00:00:00 atd
root 1867 1 0 19:02 ? 00:00:00 acpid -c /etc/acpi/events -s /va
root 1870 1 0 19:02 ? 00:00:00 /usr/sbin/irqbalance
root 1886 1 0 19:02 ? 00:00:00 /usr/sbin/sshd -D
root 1910 1 0 19:02 ? 00:00:00 upstart-file-bridge --daemon
root 1925 1 0 19:02 ? 00:00:00 /bin/sh /etc/init.d/ondemand bac
root 1937 1925 0 19:02 ? 00:00:00 sleep 60
syslog 1943 1 2 19:02 ? 00:00:00 rsyslogd
root 2023 1 0 19:02 ? 00:00:00 /usr/bin/python /usr/bin/cloud-i
root 2025 0 0 19:02 ? 00:00:00 ps -ef