[CRIU] cgroups restore failure

[Radostin Stoyanov]

Hello,

I am facing the following problem on container restore:

(00.000311) cg: Preparing cgroups yard (cgroups restore mode 0x4)
(00.000370) Error (criu/util.c:1150): Unable to mount tmpfs in
.criu.cgyard.b7ASXZ: Invalid argument
(00.000379) Error (criu/cgroup.c:1167): cg: Unable to umount
.criu.cgyard.b7ASXZ: Invalid argument

The full restore.log output of criu is https://pastebin.com/jP75EewF
The code that does the dump/restore is
https://github.com/rst0git/libvirt/blob/live-migration/src/lxc/lxc_criu.c

Any ideas why the mount call fails with "Invalid argument"?

Thanks,
Radostin