Hello, https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=4f41fc59620fcedaa97cbdf3d7d2956d80fcd922
This commit breaks criu: [root@fc22-vm criu]# ./criu/criu check Error (mount.c:403): mnt: No root found for mountpoint 35 (@./sys/kernel/debug) The problem is that mountinfo doesn't contain a /sys mount, so criu can't build a tree of mounts. [root@fc22-vm criu]# cat /proc/self/mountinfo | grep 17 20 17 0:18 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:7 - securityfs securityfs rw 24 17 0:21 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:8 - tmpfs tmpfs ro,mode=755 26 17 0:23 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:18 - pstore pstore rw 34 24 0:31 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,freezer 54 17 0:32 / /sys/kernel/config rw,relatime shared:19 - configfs configfs rw 35 17 0:7 / /sys/kernel/debug rw,relatime shared:22 - debugfs debugfs rw [root@fc22-vm criu]# python >>> import os >>> os.open("/sys", os.O_RDONLY) 3 >>> [1]+ Stopped python [root@fc22-vm criu]# ps PID TTY TIME CMD 760 pts/0 00:00:00 bash 913 pts/0 00:00:00 python 914 pts/0 00:00:00 ps [root@fc22-vm criu]# cat /proc/913/fdinfo/3 pos: 0 flags: 0100000 mnt_id: 17 Thanks, Andrew