[CRIU] Criu Restore Error

[Cyrill Gorcunov]

On Tue, Mar 24, 2015 at 11:01:09AM +0530, Priyanka Naik wrote:
>    I m running a sample process on my host machine and dumping it on the
>    host. If i try to restore the process on the host OS, the process gets
>    restored back successfully. But now I m tarring my dumped files directory
>    into a .tgz file and sending it to guest using virtIO serial as the medium
>    of transfer. The transfer of dumped files take place successfully as I m
>    checking the hash values of both the files using md5sum. I m untarring it
>    on guest and trying to restore it back on the guest system but due to some
>    reasons we are unable to restore it back on the guest system.

Mind to put somewhere the image files (ie your tgz archive) so we would
take a look on the internals?

>    Firstly to start the guest we are using following command :
> 
>    qemu-system-x86_64 -m 1024 -s -hda vdisk.img -kernel
>    /usr/src/linux-3.17.6/arch/x86_64/boot/bzImage -initrd
>    /home/priyanka/tmp2/newinitrd.img -append "root=/dev/sda10" -name myguest
>    -device virtio-serial -chardev socket,path=/tmp/foo,server,nowait,id=foo
>    -device virtserialport,chardev=foo,name=org.fedoraproject.port.0
> 
>    Now once we boot the system and type the tty command on the guest we get
>    /dev/console and if we type tty on host it gives output as /dev/pts/no
>    i.e. some number associated with that terminal. We checked with the code
>    of tty.c which has facilities for both PTS and CONSOLE. But we are not
>    getting the exact reason for criu not working on guest, since we are
>    creating exact copy of the kernel on host system, the guest should have
>    all the facilities required for criu since criu is working on host.
> 
>    And as Cyrill said that we need /dev/ptmx on guest, so it is present. Even
>    /dev/pts/ptmx is present.
> 
>    What can be the problems on guest side which will make our project work?
>    What is exactly going wrong?
> 
>    Another thing is that to remove restore.log file from guest I need to
>    mount my vdisk.img. How can I proceed with that?
> 
>    I used these commands :
>    modprobe max_parts=8
> 
>    qemu-nbd -c /dev/nbd0 vdisk.img
> 
>    partprobe /dev/nbd0
> 
>    mount /dev/nbd0p1 /mnt/vdisk.img
> 
>    But I getting error for partprobe.

Which ones? I mean, put errors somewhere, lets check them. Also,
if vdisk.img is big enough? Could you share it, I suppose it doesn't
consists of some sensible information?