using the 4.15.0-041500-generic kernel, the total process count was very
high (473) just after the boot, perhaps something to do with the raid
array resync.

Now doing backup to the external disk, process count seems normal (287).

I still think there is a problem with that process count since older
kernel never showed more than 286 thread in the last year.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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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 05/17/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.70 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:bvnAmericanMegatrendsInc.:bvrP2.70:bd05/17/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ97Extreme6:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: To Be Filled By O.E.M. 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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