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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.

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Confirmed

** Tags: apport-collected xenial
Number of processes exploded after upgrade to 4.13.0-32-generic
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