[CRIU] File size is not same on restore

[Pavel Emelyanov]

On 11/09/2015 01:39 PM, 上司陽平 wrote:
> Thank you for replying but I can not solve this question...
> 
>>> I succeeded to dump a lxc container but I can't restore it.
>>>
>>> A log of restore has following error messages:
>>> (00.200896)    146: Error (files-reg.c:1078): File
>>> lib/x86_64-linux-gnu/libcgmanager.so.0.0.0 has bad size 137024 (expect
>>> 108480)
>> This message means that at the restore time file's libcgmanager.so size
>> is 137024.
>>
> Why is libcgmanager.so size 137024 at the restore time?

I don't know, this is what stat system call reports on the path in question.

> I checked a status on host OS,
> $ stat /var/lib/lxc/u1/rootfs/lib/x86_64-linux-gnu/libcgmanager.so.0.0.0
> This file's size is 108480.
> Then I checked stat on the lxc container
> $ stat /lib/x86_64-linux-gnu/libcgmanager.so.0.0.0
> This file's size is 108480.
> Therefore I think that libcgmanager.so size can not become 137024.

Maybe upon start the file in question if over-mounted by something else?
Try to find all libcgmanager.so.0.0.0 files in the root where you restore
the container.

> What is added to libcgmanager.so size?
> 
> In addition, what should I do to solve this error problem?

You can add debug info to criu so that it shows the inode and device number
is stat()-s at open_path(). Then compare these numbers with the ones you
check manually to make sure ciru and you work on the same file.

-- Pavel