This remains an issue for the HWE kernel on 18.04LTS and GA kernel for
20.04LTS (both on kernel version 5.4). The only unaffected LTS release
is xenial.


If there is indeed a fix (which isn't clear to me from the 2020-08-26 janitor 
update as it doesn't reference this bug #), will it be pushed to the affected 
LTS kernels?

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https://bugs.launchpad.net/bugs/1857257

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

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Eoan:
  Won't Fix
Status in linux source package in Focal:
  Confirmed

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 
path=/bin/busybox
  (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 https://github.com/checkpoint-restore/criu/issues/860

  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
  AlsaDevices:
   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': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  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)
  PciMultimedia:
   
  ProcFB:
   
  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
  RelatedPackageVersions:
   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)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 12/12/2017
  dmi.bios.vendor: DigitalOcean
  dmi.bios.version: 20171212
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: 
dmi:bvnDigitalOcean:bvr20171212:bd12/12/2017:svnDigitalOcean:pnDroplet:pvr20171212:cvnBochs:ct1:cvr:
  dmi.product.family: DigitalOcean_Droplet
  dmi.product.name: Droplet
  dmi.product.version: 20171212
  dmi.sys.vendor: DigitalOcean

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