I've got 4 computers running ubuntu.
2 computers affected, and 2 computers unaffected. The two affected computer are 
using btrfs.

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  Number of processes exploded after upgrade to 4.13.0-32-generic

Status in linux package in Ubuntu:

Bug description:
  After an update from 4.10.0-40-generic to 4.13.0-32-generic (ubuntu
  16.04 + hwe kernel), the number of process when doing IO on my machine
  has exploded.

  Before the update, maximum number of process : 284
  After the update, doing a simple rsync to an external disk : 771

  The system is now unstable and crashes. The processes are hundreds of

  Please let me know if there is something more needed.
   total 0
   crw-rw---- 1 root audio 116,  1 Feb  6 09:04 seq
   crw-rw---- 1 root audio 116, 33 Feb  6 09:04 timer
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
  AplayDevices: aplay: device_list:268: no soundcards found...
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  ArecordDevices: arecord: device_list:268: no soundcards found...
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic 
root=UUID=ef4f1569-51cf-478d-868c-78a3b7f04a2c ro
  ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
   linux-restricted-modules-4.13.0-32-generic N/A
   linux-backports-modules-4.13.0-32-generic  N/A
   linux-firmware                             1.157.15
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip kvm libvirtd lpadmin lxd plugdev sambashare 
sudo sudo-no-log video
  _MarkForUpload: True
  dmi.bios.date: 05/17/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.70
  dmi.board.name: Z97 Extreme6
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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