[CRIU] Criu Restore Error

[Priyanka Naik]

This what I m running to mount the vdisk.img file

root at priyanka-Lenovo-G510:~# modprobe nbd max_parts=8
root at priyanka-Lenovo-G510:~# qemu-nbd -c /dev/nbd0 /usr/bin/vdisk.img
root at priyanka-Lenovo-G510:~# partprobe /dev/nbd0
Error: Error informing the kernel about modifications to partition
/dev/nbd0p1 -- Invalid argument.  This means Linux won't know about any
changes you made to /dev/nbd0p1 until you reboot -- so you shouldn't mount
it or use it in any way before rebooting.
Error: Failed to add partition 1 (Invalid argument)

I hava attached the vdisk.img and 3444.tgz file which contains dumped files
related to process having PID 3444.

Since the initrd image through which I m booting my guest is big, so I will
try uploading it on drive and share it with u.

On Tue, Mar 24, 2015 at 12:45 PM, Cyrill Gorcunov <gorcunov at gmail.com>
wrote:

> 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?
>
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