[Trusty] systemd startup fails in the presence of cgmanager

[Thomas Voß]

In trusty, systemd 204 clashes with cgmanager, with systemd failing to start up properly. As a consequence, snapd fails to operate properly.

[Thomas Voß (thomas-voss)]

From /var/log/upstart/systemd.log:

systemd 204 running in system mode. (+PAM +LIBWRAP +AUDIT +SELINUX +IMA -SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ)
Detected virtualization 'kvm'.
Inserted module 'autofs4'
Set hostname to <ubuntu-VirtualBox>.
/etc/mtab is not a symlink or not pointing to /proc/self/mounts. This is not supported anymore. Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.
Failed to install release agent, ignoring: File exists
ESC[1;31mcgmanager: cgm_enter for controller=systemd, cgroup_path=system, pid=0 failed: invalid requestESC[0m
ESC[1;31mFailed to create root cgroup hierarchy: Operation not permittedESC[0m
ESC[1;31mFailed to allocate manager object: Operation not permittedESC[0m

[Thomas Voß (thomas-voss)]

Corresponding cgmanager:

cgmanager: could not open cgroup file for 0
cgmanager:victim_under_proxy_cgroup: Could not determine the victim's cgroup
cgmanager:do_move_pid_main: victim's cgroup is not under proxy's (p.uid 0)

[Dimitri John Ledkov (xnox)]

Will be handled part of the systemd SRU.