[CRIU] File size is not same on restore

[上司陽平]

Hi, I have an error and want to help me.
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)
(00.200902)    258:     pr2 Read page 7f79620bf000 from self 
7f79620bf000/4f000
(00.200906)    146: Error (cr-restore.c:257): Can't fixup VMA's fd

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, it is same!!

Therefore I injected debug print at the dump_one_reg_file function in 
files-reg.c.

if (S_ISREG(p->stat.st_mode) && should_check_size(rfe.flags)) {
                 rfe.has_size = true;
                 rfe.size = p->stat.st_size;
                 pr_debug("Debug: %s has %"PRIu64"\n", rfe.name, rfe.size);
}

This printed in the log of dump,
(00.113142) Debug: /lib/x86_64-linux-gnu/libcgmanager.so.0.0.0 has 108480

I think that size information of an open file is stored to an image file 
after this checking.
However this size is not same on restore.

ENV is following:
uname -a ->
Linux uhoi 4.2.5 #1 SMP Wed Oct 28 14:39:35 JST 2015 x86_64 x86_64 
x86_64 GNU/Linux
criu -V ->
Version: 1.7.2
GitID: v1.7-17-g2bf517e

Someone please tell me how to resolve these errors.
Appreciate your helping hands.

Thanks,
Yohei Kamitsukasa