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The columns 4 and 5 are root and mountpoint respectively. You can see, that the / is /root file from /dev/sda1 device and /bar file is a mountpoint with the root being /foo file from the same device.
The columns 4 and 5 are root and mountpoint respectively. You can see, that the / is /root file from /dev/sda1 device and /bar file is a mountpoint with the root being /foo file from the same device.
== How to teach CRIU to dump them ==
By default CRIU doesn't dump such mountpoints, because there's no way CRIU will be able to restore it -- the root of these mounts is out of the scope of what CRIU dumped. In the logs you would see the message like
34:/bar doesn't have a proper root mount
which will mean, that the mountpoint /bar has inaccessible root.