Andrew absolutely right, problem introduced by commit

I will try to dive into overlayfs internals and find solution.

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  linux-image-5.0.0-35-generic breaks checkpointing of container

Status in linux package in Ubuntu:

Bug description:
  Trying to checkpoint a container (docker/podman) on 18.04 fails
  starting with linux-image-5.0.0-35-generic. We (CRIU upstream) see
  this in Travis starting a few weeks ago. Manually testing it locally
  shows that linux-image-5.0.0-32-generic still works and linux-
  image-5.0.0-35-generic does not longer work. It seems to be overlayfs
  related, at least that is what we believe. The CRIU error message we
  see is:

  (00.170944) Error (criu/files-reg.c:1277): Can't lookup mount=410 for fd=-3 
  (00.170987) Error (criu/cr-dump.c:1246): Collect mappings (pid: 1637) failed 
with -1

  We have not seen this only in Travis, but also multiple CRIU users reported 
that bug already. Currently we have to tell them to downgrade the kernel.

  I also able to reproduce it with linux-image-5.3.0-24-generic. Staying
  on the 4.18.0 kernel series does not show this error.
  4.18.0-25-generic works without problems.

  See also

  One of the possible explanations from our side include:

  "Looks like we have the same as for st_dev now with mnt_id, that is
  bad, because we can't find on which mount to open the file if kernel
  hides these information from us."

  Running on the upstream 5.5.0-rc1 kernel does not show this error.
  ProblemType: Bug
   total 0
   crw-rw---- 1 root audio 116,  1 Jan  7 18:52 seq
   crw-rw---- 1 root audio 116, 33 Jan  7 18:52 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 19.10
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: DigitalOcean Droplet
  Package: linux (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-generic 
root=PARTUUID=5b57f3f9-086a-4a7d-ae78-efdee8842586 ro console=tty1 console=ttyS0
  ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13
   linux-restricted-modules-5.3.0-26-generic N/A
   linux-backports-modules-5.3.0-26-generic  N/A
   linux-firmware                            N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  eoan uec-images
  Uname: Linux 5.3.0-26-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: True 12/12/2017
  dmi.bios.vendor: DigitalOcean
  dmi.bios.version: 20171212
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
dmi:bvnDigitalOcean:bvr20171212:bd12/12/2017:svnDigitalOcean:pnDroplet:pvr20171212:cvnBochs:ct1:cvr: DigitalOcean_Droplet Droplet
  dmi.product.version: 20171212
  dmi.sys.vendor: DigitalOcean

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