[CRIU] irmap: Can't stat /no-such-path: No such file or directory

[Tycho Andersen]

Hi all,

With newer versions of ubuntu (host and guest), I'm seeing the error
listed in the subject. The full log is:

http://paste.ubuntu.com/12279228/

It seems to me like we shouldn't be trying to stat no-such-path, but
that seems like the symptom of a larger problem which is that we can't
otherwise resolve the handle.

I resolved the inode using debugfs, and it says it's /var/log in the
container, which is not one of our heuristic paths we check:

# debugfs -R 'ncheck 525799' /dev/vda1
debugfs 1.42.12 (29-Aug-2014)
Inode Pathname
525799  /var/lib/lxd/containers/unpriv/rootfs/var/log

If I add this path (and several others, see the attached patch) to the
list of irmap hints, it works fine. Obviously this isn't sustainable
though; is there some nicer solution to this?

Thanks,

Tycho
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