Public bug reported:

I tried the same live migration that I described in
https://bugs.launchpad.net/ubuntu/+source/criu/+bug/1605664 but this
time with CRIU 2.4 compiled from source code on both machines, now it
failed with the following:

//Sending VM
error: Error transferring container data: migration restore failed
(00.669220)      1: Error (files-reg.c:1509): File sys/fs/cgroup/systemd has 
bad mode 040755 (expect 040775)
(00.723370) Error (cr-restore.c:991): 28507 exited, status=1
(00.764229) Error (cr-restore.c:1857): Restoring FAILED.

//Receiving VM syslog:
Jul 22 15:37:57 instance-4 lxd[4040]: t=2016-07-22T15:37:57+0000 lvl=eror 
msg="Error during migration sink" err="migration restore failed\n(00.669220)    
  1: Error (files-reg.c:1509): File sys/fs/cgroup/systemd has bad mode 040755 
(expect 040775)\n(00.723370) Error (cr-restore.c:991): 28507 exited, 
status=1\n(00.764229) Error (cr-restore.c:1857): Restoring FAILED."

Ubuntu 16.04, CRIU version 2.4

** Affects: criu (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  I tried the same live migration that I described in
  https://bugs.launchpad.net/ubuntu/+source/criu/+bug/1605664 but this
  time with CRIU 2.4 compiled from source code on both machines, now it
  failed with the following:
  
+ //Sending VM
  error: Error transferring container data: migration restore failed
  (00.669220)      1: Error (files-reg.c:1509): File sys/fs/cgroup/systemd has 
bad mode 040755 (expect 040775)
  (00.723370) Error (cr-restore.c:991): 28507 exited, status=1
  (00.764229) Error (cr-restore.c:1857): Restoring FAILED.
  
+ //Receiving VM syslog:
+ Jul 22 15:37:57 instance-4 lxd[4040]: t=2016-07-22T15:37:57+0000 lvl=eror 
msg="Error during migration sink" err="migration restore failed\n(00.669220)    
  1: Error (files-reg.c:1509): File sys/fs/cgroup/systemd has bad mode 040755 
(expect 040775)\n(00.723370) Error (cr-restore.c:991): 28507 exited, 
status=1\n(00.764229) Error (cr-restore.c:1857): Restoring FAILED."
+ 
  Ubuntu 16.04, CRIU version 2.4

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https://bugs.launchpad.net/bugs/1605676

Title:
  criu 2.4 Error transferring container data: migration restore failed

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